Manure Storage and Handling: Design and Safety

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-14

Key Takeaways

• Manure storage system selection is dictated by species, herd size, climate, and land base, with capacity requirements often mandated by local regulations and cropping cycles, typically necessitating at least 6 months of storage to avoid spreading on frozen or saturated ground. This ensures nutrient utilization aligns with crop needs and minimizes environmental runoff.
• Manure characteristics, particularly solid content (categorized as solid >20% dry matter, semi-solid 5-20%, and liquid <5%), bedding type, diet, and climate, critically influence storage design, handling equipment, and associated safety risks. For instance, sand bedding increases abrasiveness and settling, while cold climates necessitate freeze-resistant designs.
• Safety is paramount, especially during agitation, which releases toxic gases like hydrogen sulfide (H₂S) that can cause rapid incapacitation and death by deadening the sense of smell at lethal concentrations. Never enter a manure pit without proper atmospheric testing, ventilation, SCBA, a safety harness, and a trained spotter.
• Strategic site selection, adhering to strict setback distances from wells, waterways, and property lines, and considering water table levels and drainage, are fundamental design principles to prevent groundwater contamination and surface runoff. Proper site drainage diverts clean water away from storage areas.
• Detailed recordkeeping of storage levels, inspection findings, maintenance, and nutrient test results is crucial for regulatory compliance, operational efficiency, and informed nutrient management planning. Regular monitoring and prompt addressing of structural issues or gas exposure signs are vital for preventing catastrophic failures and protecting human and animal health.

Manure is a valuable resource on any livestock operation. It returns nutrients to the soil, improves soil structure, and reduces the need for commercial fertilizer. But manure also presents real challenges. Stored improperly, it can pollute waterways, release harmful gases, and put you, your family, your employees, and your animals at risk. This guide covers the full scope of manure storage design and safety. It is written for livestock farmers, farm managers, and farm employees who handle manure daily or plan to build or upgrade a storage system. You will learn about storage options, design considerations, safety protocols, common mistakes, and monitoring practices that keep your operation productive and safe.

At a Glance

• Choose a storage system based on your livestock type, herd size, climate, and land base. A system that works for a 50-cow dairy in Wisconsin will not suit a 5,000-head feedlot in Texas.
• Match storage capacity to your local regulations and cropping cycle. Most operations need at least 6 months of storage to avoid spreading on frozen or saturated ground.
• Understand the three main storage categories: solid, liquid, and semi-solid. Each has different handling equipment and safety risks.
• Never enter a manure pit without proper safety equipment and protocols. Agitation releases toxic gases that can kill in minutes.
• Locate storage away from wells, waterways, and property lines. Check local setback requirements before you pour concrete or dig a pit.
• Keep detailed records of storage levels, inspections, and maintenance. These records protect you in regulatory reviews and help you plan better.
• Test your manure regularly. Nutrient content varies with diet, bedding, and storage method. You cannot plan applications without knowing what you have.
• Call your extension agent or veterinarian immediately if an animal shows signs of gas exposure or if you suspect a storage structure failure.

Understanding Manure Storage Systems

Manure storage is not a single product or one-size-fits-all solution. It is a system that includes the collection method, the storage structure, the handling equipment, and the land application plan. Each part affects the others. If you change one component, you often need to adjust the rest.

Why Storage Matters

You need manure storage for several reasons. First, you cannot spread manure every day. Weather, crop needs, and soil conditions limit when application makes sense. Spreading on frozen ground or saturated soil leads to runoff and nutrient loss. Second, regulations in many areas require you to store manure during certain seasons. Third, storage lets you time applications to match crop uptake. This maximizes the nutrient value and minimizes environmental risk.

Storage also changes the manure itself. Fresh manure contains pathogens, weed seeds, and ammonia that can harm crops or water. Proper storage reduces pathogen levels, breaks down solids, and stabilizes nutrients. The longer you store manure under the right conditions, the more predictable it becomes as a fertilizer.

Manure Characteristics That Affect Storage

Before you design or choose a storage system, you need to understand the manure you are working with. Manure varies widely depending on the species, diet, bedding, water use, and collection method.

Solid content is the most important factor. Manure with more than 20 percent dry matter is considered solid. It stacks and can be handled with a loader or spreader. Manure with 5 to 20 percent dry matter is semi-solid or slurry. It flows but contains enough solids to plug pumps. Manure with less than 5 percent dry matter is liquid. It pumps easily but requires large storage volumes.

Bedding type changes the equation. Straw and sawdust add dry matter and fiber. Sand adds weight and abrasiveness. Sand-laden manure requires special handling equipment and can settle out in storage, creating a maintenance headache. If you use sand bedding, plan for it from the start.

Diet affects nutrient content and consistency. High-forage diets produce more fibrous manure. High-grain diets produce more volatile solids and stronger odors. Rations with added salt or minerals can affect the nutrient profile of the stored manure.

Climate matters more than most farmers realize. In cold regions, manure freezes and becomes difficult to handle. In wet regions, rainfall adds volume to your storage. In hot regions, evaporation reduces volume but increases odor and nutrient loss. Design your system for your local conditions, not for a generic average.

Manure Storage Options

There are many ways to store manure. Each option has strengths and weaknesses. Your choice depends on your operation size, budget, climate, regulations, and long-term goals.

Solid Manure Storage

Solid manure storage works best for operations that produce manure with high dry matter. This includes beef cattle on dirt lots, dairy heifers on straw, and poultry operations with litter. Solid storage also works for horse operations and small-scale farms.

Stacked piles are the simplest and least expensive option. You pile manure on a concrete pad or compacted clay base and let it sit until you spread it. The pile sheds water if you shape it properly. A good pile has a flat or slightly crowned top that sheds water rather than absorbing it. You should cover the pile or locate it under a roof in wet climates to reduce leachate.

The main problem with stacked piles is nutrient loss. Rain falling on an uncovered pile washes soluble nutrients out of the manure and into the ground or nearby water. Nitrogen losses from uncovered piles can reach 30 to 50 percent over several months. Phosphorus does not leach as readily, but it can move with runoff if the pile sits on permeable ground.

Concrete bunkers are three-sided structures with a concrete floor. You push manure into the bunker with a loader and remove it the same way. Bunkers work well for semi-solid manure that does not flow on its own. They are common on dairy operations with freestall barns and scrape alleys.

Roofed storage is the gold standard for solid manure. A roof keeps rain out, preserves nutrients, and reduces odor. Roofed storage costs more upfront but pays for itself in fertilizer value over time. If you build roofed storage, design the floor with a slight slope and a drainage collection system so any liquid that drains from the pile does not become a pollution source.

Liquid Manure Storage

Liquid manure systems store manure as a pumpable liquid. These systems dominate modern dairy and swine operations because they handle large volumes efficiently and preserve nutrients well.

Earthen storage ponds are excavated basins that hold liquid manure. They are the least expensive liquid storage option for large volumes. A properly constructed earthen pond has a compacted clay liner or a synthetic liner to prevent seepage. The pond must have enough freeboard above the liquid level to handle rain and snowmelt. You should locate ponds away from wells, waterways, and drainage areas.

The biggest risk with earthen ponds is structural failure. A liner breach or an overtopping event releases thousands of gallons of manure into the environment. Regular inspection and maintenance are essential. Check for erosion, burrowing animals, cracks, and signs of seepage after every major rain event.

Concrete tanks are more expensive than earthen ponds but more reliable. They can be built above ground, partially below ground, or completely below ground. Concrete tanks are common on dairy and swine operations where space is limited or groundwater is close to the surface. They require less land than earthen ponds and are easier to inspect.

Steel tanks are used for smaller operations or where space is very tight. They are the most expensive option per gallon of storage. Steel tanks are common on small dairies, swine operations, and custom manure storage businesses.

Above-ground tanks offer the advantage of gravity flow for some operations. You can locate them at a high point and let manure flow to the tank, then pump it out for application. Above-ground tanks are easier to inspect for leaks than buried tanks. They are also easier to clean and maintain.

Semi-Solid and Covered Storage

Semi-solid manure falls between solid and liquid. It does not stack well and does not pump easily. These systems are common on smaller dairies and beef operations.

Manure pack is the traditional system for bedded pack barns. You add fresh bedding to the pack over weeks or months, then clean out the entire pack. The pack composts slowly, reducing volume and pathogen levels. The challenge is managing moisture. A pack that gets too wet becomes anaerobic and produces strong odors and harmful gases.

Covered storage is becoming more common for both solid and liquid systems. Covers reduce odor, prevent rain from adding volume, and reduce nutrient losses. Floating covers on liquid storage also reduce gas emissions. The main drawback is cost. A good cover system can add 20 to 40 percent to the storage cost.

Choosing the Right System

There is no perfect manure storage system. The right choice depends on your specific situation. Work through these questions before you decide.

What is your herd size and manure production? Estimate the total volume you produce each year. A mature dairy cow produces about 20 cubic feet of manure per month. A mature hog produces about 3 cubic feet. A beef steer produces about 15 cubic feet. Multiply your animal count by the per-animal production to get your annual total.

How much land do you have for application? Your storage should match your land base. If you have limited land, you need more storage so you can apply at the right times. If you have abundant land, you can use shorter storage periods and apply more frequently.

What are your local regulations? Many states and counties require minimum storage capacity, specific setback distances, and permits for larger operations. Check with your local extension office or agricultural agency before you invest in a system.

What is your budget? Include not just construction costs but also operating costs. A cheap system that requires constant maintenance or loses nutrients may cost more over time than a more expensive system that works efficiently.

What is your risk tolerance? Some systems have higher environmental risk than others. A leaking earthen pond can destroy a waterway. A failing concrete tank can contaminate groundwater. Consider the cost of failure, not just the cost of construction.

Manure Storage Design Principles

Good design prevents most storage problems. Whether you build a simple pile or a complex liquid system, these principles apply.

Site Selection

The location of your storage determines many of its risks. Poor siting is the most common design mistake.

Setbacks are non-negotiable. Most regulations require minimum distances from wells, waterways, property lines, roads, and occupied buildings. These setbacks exist for good reasons. Manure contains pathogens and nutrients that move with water. A well that draws contaminated groundwater can make your family and neighbors sick. A stream that receives runoff can kill fish and trigger regulatory action.

Consider the water table. Liquid storage below the water table creates constant pressure that can force manure into groundwater. If you are building below ground, have a geotechnical engineer assess the site. You may need a liner system or an above-ground design.

Think about drainage. Your storage should not receive runoff from surrounding land. A pile that sits in a low spot collects rainwater and produces leachate. Build pads with a slight slope away from the pile. Direct clean water around the storage area with diversion ditches or berms.

Plan for access. You need room to maneuver loaders, pumps, and spreaders. A storage facility that is hard to access will be used poorly. Design for efficient loading and unloading from day one.

Capacity Planning

Your storage must hold enough manure to cover your longest no-spread period. In most regions, this is winter. In wet regions, it may also include wet spring months.

Calculate your storage period. Determine the number of days you cannot spread. Include a safety margin for weather delays. A 180-day storage period is common in northern regions. Some operations need more.

Account for rainfall and runoff. If your storage is uncovered, rain adds volume. In a 180-day period, a 1-acre storage area in a region with 40 inches of annual rainfall receives more than 1 million gallons of rain. That is a significant volume. You can either build extra capacity or cover the storage.

Include a safety margin. Never fill your storage to the brim. Leave freeboard for unexpected rain, equipment breakdowns, or missed application windows. A minimum of 12 inches of freeboard is standard for liquid storage. More is better.

Think about agitation needs. Liquid storage needs room for agitation. If the tank is too full, you cannot agitate effectively, and solids settle to the bottom. This creates a maintenance problem and reduces storage capacity over time.

Materials and Construction

The materials you use determine the lifespan and reliability of your storage.

Concrete is the standard for permanent structures. Use concrete with a low water-to-cement ratio and adequate reinforcement. The concrete should be designed for manure exposure, which is corrosive. A high-quality concrete with a proper sealer will last 20 to 30 years or more.

Steel is used for tanks and some covers. It is strong and durable but requires corrosion protection. Galvanized steel works for some applications, but manure is corrosive to many metals. Stainless steel is more expensive but lasts longer in manure service.

Synthetic liners are used for earthen ponds and some concrete repairs. High-density polyethylene (HDPE) liners are the most common. They are durable, flexible, and resistant to manure chemicals. Proper installation is critical. A liner with a single puncture can leak significantly.

Compacted clay is used as a liner for earthen ponds in some regions. It works if the clay has the right properties and is compacted properly. But clay liners are less reliable than synthetic liners. If you use clay, have it tested and certified by a geotechnical engineer.

Safety Features in Design

Good design includes safety features that protect people and animals.

Fencing is essential around liquid storage. Animals and people can drown in manure ponds. A fence with a locked gate prevents accidents. Post warning signs in multiple languages if you have a diverse workforce.

Ladders and access points are needed for inspection but must be designed for safety. A permanent ladder with a safety cage is better than a portable ladder. Never enter a manure storage without a second person present and proper safety equipment.

Ventilation is critical for enclosed storage or pits under buildings. Manure produces methane, hydrogen sulfide, ammonia, and carbon dioxide. These gases can accumulate to dangerous levels. Design for natural or mechanical ventilation that keeps gas levels below dangerous thresholds.

Emergency shutoffs for pumps and agitation equipment prevent accidents. Locate them away from the storage so you can shut down equipment without approaching the hazard.

Manure Pit Safety

Manure pits are among the most dangerous places on a farm. The gases they produce kill people and animals every year. Understanding the risks and following safety protocols can save lives.

The Gases That Kill

Manure decomposition produces several gases. Each has specific dangers.

Hydrogen sulfide is the most deadly. It is produced when manure decomposes without oxygen. Hydrogen sulfide smells like rotten eggs at low concentrations. But at higher concentrations, it deadens your sense of smell. You cannot rely on odor to warn you. At concentrations above 500 parts per million, hydrogen sulfide can cause loss of consciousness and death within minutes. Agitation releases hydrogen sulfide in large bursts. Several people have died in manure pits within seconds of starting agitation.

Methane is flammable and explosive. It is produced in the same anaerobic conditions that produce hydrogen sulfide. Methane can accumulate in enclosed spaces and ignite with a single spark. Ventilation is the only effective control.

Carbon dioxide is heavier than air and accumulates in low spots. It displaces oxygen. In a manure pit, carbon dioxide levels can rise high enough to cause asphyxiation. Because it is odorless and colorless, you may not realize the danger until it is too late.

Ammonia is produced from the nitrogen in manure. It is irritating to eyes and lungs at moderate levels. At high levels, it can cause severe respiratory damage. Ammonia levels rise during agitation and in poorly ventilated spaces.

The Dangers of Agitation

Agitation is the most dangerous manure handling activity. When you agitate manure to mix solids and liquids, you release trapped gases. The release can be sudden and massive. Hydrogen sulfide levels can spike from safe to lethal in seconds.

Never agitate without ventilation. If your pit is under a building, open all doors and run fans before you start. Agitate only when wind conditions will move gases away from people and animals.

Keep people out of the building during agitation. Do not allow workers, family members, or visitors to enter the barn while you are agitating. Move animals out if possible. If you cannot move animals, keep agitation periods short and monitor gas levels continuously.

Never enter a pit during or immediately after agitation. Even with ventilation, gas levels can remain dangerous for hours. Wait until the pit has been thoroughly ventilated and tested before anyone enters.

Use a spotter. If you must approach a pit, have someone outside who can see and hear you. The spotter should have a plan for rescue and should never enter the pit to attempt a rescue without proper equipment.

Entry Protocols

There are times when you must enter a manure pit. Pump maintenance, inspection, and repair all require entry. These entries must follow strict protocols.

Test the atmosphere first. Use a gas detector that measures hydrogen sulfide, methane, oxygen, and carbon dioxide. Test at multiple depths because gases stratify. Test before you open the pit and continue monitoring while you work.

Ventilate thoroughly. Run fans or use portable ventilation equipment before entry. The goal is to bring oxygen levels to at least 19.5 percent and keep toxic gases below their exposure limits.

Wear a self-contained breathing apparatus (SCBA) or a supplied-air respirator. A dust mask or an N95 respirator does not protect you from hydrogen sulfide or oxygen deficiency. You need an air supply that does not rely on the pit atmosphere.

Use a safety harness and lifeline. Attach the lifeline to a secure anchor outside the pit. A second person should tend the lifeline and be prepared to pull you out. Do not tie the lifeline off in a way that prevents immediate rescue.

Never work alone. The buddy system is not optional. If something goes wrong, you need someone who can call for help and initiate rescue.

Have a rescue plan. Know what you will do if someone collapses in the pit. The standard rule is: do not enter the pit to rescue someone unless you have SCBA and a harness. Too many people die trying to rescue others. Call 911 immediately and wait for trained responders.

Gas Monitoring Equipment

Every operation with manure storage should own a gas detector. These devices are not expensive compared to the lives they protect.

Multi-gas detectors measure oxygen, hydrogen sulfide, carbon monoxide, and combustible gases. They are the standard for confined space entry. You can buy a reliable unit for a few hundred dollars. Calibrate it regularly according to the manufacturer instructions.

Stationary monitors are available for buildings with manure pits. These systems continuously monitor gas levels and alarm when concentrations rise. They are a good investment for enclosed facilities.

Colorimetric tubes are a low-cost backup. They use chemical reactions to measure specific gases. They are less convenient than electronic detectors but work when you need a quick check.

Manure Handling Systems

Storage is only part of the system. You also need to move manure from the barn to storage and from storage to the field. The handling system you choose affects labor, equipment costs, and safety.

Collection Systems

Scrape systems are common in dairy freestall barns and some swine operations. A tractor with a blade or an automated alley scraper moves manure to a collection point. Scrape systems work best with semi-solid manure that does not flow easily. They require daily operation and a place to store the collected manure.

Flush systems use water to move manure through channels or alleys. They are common in swine operations and some dairies. Flush systems use large volumes of water, which increases storage volume requirements. They work best with liquid manure systems.

Gutter and auger systems are used in some tie-stall barns and small operations. Manure falls into a gutter and is moved by an auger or chain to a collection point. These systems require less water than flush systems but more maintenance.

Vacuum systems are used in some European-style operations. They suck manure from collection points into a storage tank. Vacuum systems reduce odor and are efficient, but they require specialized equipment.

Transfer and Pumping

Moving manure from collection to storage requires pumps or gravity flow. The choice depends on the manure consistency and the distance involved.

Centrifugal pumps are the most common for liquid manure. They handle moderate solids well and are relatively inexpensive. They are not suitable for very thick manure or manure with large solids.

Progressive cavity pumps handle thicker manure and higher solids content. They are more expensive than centrifugal pumps but more versatile. They are common in operations with semi-solid manure.

Piston pumps are used for very thick manure. They push manure through pipes with high pressure. They are durable but require more maintenance than other pumps.

Gravity flow works when you can locate storage below the barn. It is the cheapest option but limits your site selection. Some operations use gravity to move manure to a sump, then pump from the sump to storage.

Land Application Equipment

Getting manure to the field is the final step. The equipment you use depends on the manure type and your application goals.

Solid spreaders handle stacked manure. They come in box spreaders, which use a moving floor and beaters, and flail spreaders, which use a rotating drum. Solid spreaders are simple and reliable but require more labor than liquid systems.

Liquid tankers haul liquid manure to the field. They come in various sizes, from small units for tractors to large semi-mounted units. Tankers with injection systems place manure below the soil surface, reducing odor and nutrient loss.

Drag hose systems use a pump to move manure through a hose from storage to the field. They are efficient for large operations and can apply manure to distant fields without hauling. They require a reliable water supply and careful management to avoid soil compaction.

Center pivot irrigation systems can apply liquid manure to large areas. They are common in the western United States. They require very liquid manure and careful management to avoid clogging nozzles.

Common Mistakes in Manure Storage and Handling

Learning from other farmers mistakes saves you time, money, and risk. These are the most common problems we see in manure storage and handling.

Underestimating Volume

Most farmers underestimate how much manure they produce. They design storage that is too small and then struggle with full storage at the wrong time. The fix is to calculate your manure production carefully and add a safety margin. If you are not sure, ask your extension agent for help with the calculation.

Ignoring the Water Factor

Rain and snowmelt add significant volume to uncovered storage. A farmer who designs for 6 months of manure storage but forgets the rain may have only 4 months of actual capacity. This leads to spreading at the wrong time or overtopping the storage. Cover your storage or build extra capacity for water.

Poor Site Drainage

A manure pile or storage area that sits in a low spot collects water and produces leachate. This is both a nutrient loss and an environmental problem. Build your storage on slightly elevated ground and divert clean water around it.

Skipping Regular Inspection

Manure storage structures fail slowly. A small crack in a concrete wall or a small hole in a liner becomes a big problem if left unchecked. Walk your storage areas monthly. Look for signs of seepage, erosion, cracking, and structural movement. Fix small problems before they become large ones.

Failing to Agitate Properly

Liquid manure settles. Solids accumulate on the bottom and reduce storage capacity. If you do not agitate regularly, you lose capacity and create a difficult cleanup problem. Agitate thoroughly before each pumping event.

Entering Pits Without Protection

The most tragic mistakes are the ones that cost lives. Every year, farmers die entering manure pits without gas detection, ventilation, and rescue plans. The gases are invisible and can kill in seconds. There is no excuse for entering a pit without proper safety equipment.

Not Testing Manure

Manure nutrient content varies widely. Without testing, you are guessing at application rates. You may apply too much, wasting money and risking runoff, or too little, shortchanging your crops. Test manure at least once a year, preferably more often.

Ignoring Regulations

Manure storage is heavily regulated in many areas. Regulators inspect operations and can issue fines or orders for noncompliance. Know your local requirements and document your compliance. A paper trail protects you in case of an inspection or complaint.

Monitoring and Recordkeeping

Good recordkeeping is not just for regulators. It helps you manage your operation better and make informed decisions.

What to Record

Keep a log for each manure storage facility. Record these items at minimum:

• Storage level (as a percentage of capacity) on a weekly basis
• Date and duration of agitation events
• Date and volume of pumping and land application
• Nutrient test results for each storage and each application
• Inspection findings, including any cracks, seepage, or structural issues
• Maintenance performed, including repairs and modifications
• Weather events that affected storage, such as heavy rain or flooding
• Gas monitoring results if you enter a pit

Using Your Records

Records help you answer important questions. How much storage capacity do you actually have? When did you last test your manure? What application rates worked best for your crops? What maintenance is due?

Records also protect you in a regulatory dispute. If a neighbor complains about odor or a regulator investigates a water quality issue, your records show that you managed your storage responsibly.

Creating a Monitoring Schedule

Set a regular schedule for monitoring and stick to it. A weekly walk-around of your storage facilities is a good starting point. Monthly, do a more thorough inspection. Quarterly, check safety equipment and test gas detectors. Annually, review your whole system and plan for improvements.

When to Call for Help

Some problems are beyond your ability to fix safely. Call your extension agent or a professional consultant when you face:

• Structural concerns such as cracks, bulges, or signs of movement in concrete or steel
• Seepage or unexplained water flow near your storage
• Gas levels that exceed safe limits during routine monitoring
• Animals showing signs of gas exposure or unexplained deaths
• Regulatory questions about permits, inspections, or compliance
• Major repairs or upgrades that require engineering judgment

Your veterinarian should be involved if animals show signs of gas exposure. Symptoms can include difficulty breathing, coughing, eye irritation, weakness, or sudden death. Do not wait to call. Gas exposure is a medical emergency.

Environmental Considerations

Manure storage is not just a farm management issue. It is an environmental issue. Poorly managed storage can harm water quality, air quality, and soil health.

Water Quality

The biggest environmental risk from manure storage is water pollution. Manure contains nitrogen, phosphorus, pathogens, and organic matter. These pollutants can reach water through runoff, seepage, or direct discharge.

Nitrogen in water can cause algae blooms that deplete oxygen and kill fish. High nitrate levels in drinking water are dangerous for infants and can cause a condition called blue baby syndrome.

Phosphorus is the main cause of algae blooms in freshwater lakes and streams. Even small amounts of phosphorus can trigger significant algae growth.

Pathogens from manure can contaminate drinking water and cause serious illness. E. coli, Salmonella, and Cryptosporidium are all found in manure and can survive in water for weeks or months.

Air Quality

Manure storage produces odors and gases that affect air quality. Odor is the most common complaint from neighbors. It is not just a nuisance. Odor indicates that gases are being released, and some of those gases are harmful.

Ammonia emissions from manure contribute to air pollution and can harm sensitive ecosystems. Ammonia also represents a loss of nitrogen that you could have used as fertilizer.

Hydrogen sulfide and other volatile compounds contribute to odor and can be harmful at high concentrations.

Methane is a potent greenhouse gas. Manure storage is a significant source of agricultural methane emissions.

Reducing Environmental Impact

You can reduce the environmental impact of your manure storage with good design and management.

Cover your storage. Covers reduce odor, prevent rain from adding volume, and reduce gas emissions. Floating covers on liquid storage are particularly effective.

Time your applications. Apply manure when crops can use the nutrients and when the ground is not frozen or saturated. This reduces runoff and nutrient loss.

Use injection or incorporation. Injecting manure below the soil surface reduces odor and nutrient loss compared to surface application.

Test your soil and manure. Match application rates to crop needs and soil conditions. Overapplication is both an environmental problem and a waste of money.

Maintain buffer strips. Keep vegetated buffers between your storage and waterways. Buffers filter runoff and provide a visual and physical separation.

Economic Considerations

Manure storage is an investment. The costs are significant, but so are the benefits. Understanding the economics helps you make better decisions.

Costs of Manure Storage

The cost of manure storage varies widely by system type and size. Earthen ponds are the least expensive for large volumes. Concrete tanks are more expensive but more durable. Steel tanks are the most expensive per gallon of capacity.

Operating costs include pumping, agitation, maintenance, and repairs. These costs add up over time. A system that is cheap to build but expensive to operate may not be the best choice.

Benefits of Manure Storage

Manure has real fertilizer value. A ton of dairy manure contains roughly 10 pounds of nitrogen, 5 pounds of phosphorus, and 10 pounds of potassium. At current fertilizer prices, that is worth $15 to $25 per ton. A 100-cow dairy produces hundreds of tons of manure per year.

Good storage preserves more of this value. Covered storage reduces nutrient losses from rain and volatilization. Liquid storage preserves nitrogen better than solid storage. Every pound of nutrient you preserve is a pound you do not have to buy as commercial fertilizer.

Cost-Sharing and Assistance

Many states and federal programs offer cost-sharing for manure storage improvements. The USDA Environmental Quality Incentives Program (EQIP) provides financial and technical assistance for conservation practices, including manure storage. Check with your local USDA service center for current programs.

Your state department of agriculture or environmental agency may also have programs. Some states offer low-interest loans or grants for manure storage projects.

Regulatory Compliance

Manure storage is regulated at the federal, state, and local levels. The rules vary by location and operation size. Understanding your obligations is essential.

Federal Requirements

The Clean Water Act regulates concentrated animal feeding operations (CAFOs). If your operation meets the CAFO definition, you need a National Pollutant Discharge Elimination System (NPDES) permit. This permit requires a nutrient management plan, proper storage, and recordkeeping.

The USDA and the Environmental Protection Agency (EPA) have joint oversight of CAFO regulations. Your state may have additional requirements.

State and Local Requirements

Most states have their own regulations for manure storage. These often include specific design standards, setback distances, and inspection requirements. Some states require permits for new or expanded storage facilities.

Local governments may also have zoning, nuisance, or environmental regulations that apply. Check with your county planning department and local health department before you build.

Working with Regulators

Regulators are not your enemies. They are there to protect public health and the environment. A cooperative relationship with regulators is better than an adversarial one.

If you have questions about your obligations, ask. Your extension agent can help you understand the regulations and connect you with the right agencies. If you receive an inspection notice, prepare your records and be transparent.

Manure Storage Design Case Studies

Real examples help illustrate the principles in action. These are composite scenarios based on common situations.

Small Dairy in a Cold Climate

A 60-cow dairy in Wisconsin needs new manure storage. The farm has 150 acres of cropland and a freestall barn with scrape alleys. The winters are long, and the ground is frozen from December through March.

The farmer chooses a concrete tank with a 9-month storage capacity. The tank is 20 feet deep and 60 feet in diameter. It is located 200 feet from the barn and 300 feet from the nearest well. A floating cover reduces odor and keeps rain out.

The farmer uses a tractor-mounted scraper to move manure from the barn to a reception pit. A piston pump transfers manure from the reception pit to the tank. In the spring and fall, the farmer uses a tanker with an injector to apply the manure. The system has worked well for 10 years with minimal maintenance.

Large Swine Operation in the Midwest

A 5,000-head swine operation in Iowa has two earthen storage ponds. Each pond holds 12 million gallons. The ponds are lined with HDPE and located on high ground away from waterways.

The operation uses a flush system to move manure from the barns to a collection sump. Centrifugal pumps transfer the manure to the ponds. Before each pumping event, the farmer agitates the ponds for 24 hours to mix solids and liquids.

The farmer applies manure through a drag hose system to corn and soybean fields within 3 miles of the operation. Soil tests guide application rates. The farmer keeps detailed records of applications, including rates, dates, and field locations.

Small Beef Operation in the South

A 50-head cow-calf operation in Georgia uses a solid manure system. The cattle are on a dirt lot with a concrete feed pad. The farmer scrapes the lot weekly and stacks the manure on a concrete pad with a roof.

The stacked manure composts for 6 to 12 months before application. The farmer spreads the compost on hay fields and gardens. The system is simple, low-cost, and works well for the operation size.

Future Trends in Manure Storage

Manure storage technology is evolving. New approaches address environmental concerns, improve nutrient recovery, and reduce costs.

Anaerobic Digestion

Anaerobic digesters break down manure in an oxygen-free environment, producing biogas that can generate electricity or heat. Digesters reduce odor, destroy pathogens, and produce a more stable fertilizer. They are expensive to build but can generate revenue through energy production.

Nutrient Recovery

New technologies can recover nitrogen and phosphorus from manure. These nutrients can be concentrated into commercial-grade fertilizers or sold as products. Nutrient recovery reduces the volume of manure you need to haul and can create a new revenue stream.

Improved Covers

Cover technology continues to improve. New materials are more durable, easier to install, and more effective at reducing gas emissions. Some covers even capture methane for energy production.

Precision Application

GPS-guided application equipment can vary application rates based on soil conditions and crop needs. This reduces overapplication, saves money, and protects water quality.

Frequently Asked Questions

How much manure storage capacity do I need?

Most operations need at least 6 months of storage. In cold climates with long winters, 8 to 12 months is common. Calculate your manure production, add rainfall if your storage is uncovered, and include a safety margin. Your extension agent can help with the calculation.

What is the safest way to agitate a manure pit?

Open all doors and run fans before you start. Keep people out of the building during agitation. Monitor gas levels continuously. Agitate in short bursts if animals are in the building. Never enter the pit during or immediately after agitation.

How often should I test my manure?

Test at least once a year. Test more often if you change diets, bedding, or storage methods. Test each storage facility separately because nutrient content can vary between facilities.

Can I spread manure on frozen ground?

Spreading on frozen ground is risky because runoff is likely. Many states restrict or prohibit spreading on frozen or snow-covered ground. If you must spread, use injection or incorporation and stay far from waterways.

How do I know if my storage is leaking?

Look for wet spots, unusual vegetation growth, or odors near the storage. Check the area around earthen ponds for seepage. Monitor the water level in the storage and compare it to expected levels. If you suspect a leak, call your extension agent or a consultant.

What should I do if I smell rotten eggs near my manure pit?

A rotten egg smell indicates hydrogen sulfide. This is a serious hazard. Leave the area immediately and warn others. Ventilate the area and test gas levels before anyone approaches. If someone is down in the pit, do not enter. Call 911 and wait for trained responders.

How close can I build manure storage to a well?

Setback distances vary by state and local regulations. Common requirements are 100 to 300 feet from wells, 100 to 200 feet from waterways, and 50 to 100 feet from property lines. Check your local regulations before you build.

What is the difference between a nutrient management plan and a manure management plan?

A manure management plan covers the storage, handling, and application of manure. A nutrient management plan is broader and covers all nutrient sources, including commercial fertilizer, to meet crop needs while protecting water quality. Many operations need both.

Related Farming Guides

This section will be populated with related farming guides that complement the information on manure storage and handling. Check back for updates or explore the farm management category for additional resources on livestock operations, nutrient management, and environmental stewardship.

Related Clinical & Scientific Guides

• Animal Welfare Audits: Building a Useful Farm Program
• Total Mixed Ration (TMR) for Dairy: Mixing and Feeding Management
• Feed Additives for Livestock: Probiotics, Enzymes, and More

References

• USDA Farm Management: https://www.farmers.gov/
• FAO Farm Management: https://www.fao.org/farmer-field-schools/en/
• FAO Animal Production and Health: https://www.fao.org/animal-production/en/
• WOAH (World Organisation for Animal Health): https://www.woah.org/en/home/

This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.