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Hog Confinement Safety

Hog confinement buildings contain hazards that can be invisible. Gas, failed ventilation and manure pits have caused deaths, so this is a place for training, planning and respect.

What makes hog confinement hazardous?

Confinement buildings combine animals, manure, mechanical equipment and enclosed air. Manure storage under or beside the building can release gases when disturbed. A failure of ventilation can affect both animals and people.

Some of the gases cannot be seen or smelled at dangerous levels. A person cannot judge safety by smell. This is why official guidance, monitoring and training matter so much.

Alarm systems, written procedures and training are part of the answer, but they only work if everyone follows them every time, including when the job seems routine. Ask your veterinarian and an extension specialist what training exists for your type of operation, and sign up before busy seasons.

• Gases may be invisible and odorless at dangerous levels
• Conditions can change quickly during agitation
• Confined spaces can trap rescuers too

What are manure pits and why are they dangerous?

Manure pits and storage areas are confined spaces. Agitating or pumping manure can release gases quickly. People have died both from the gas and while trying to rescue someone else.

Do not enter a pit or storage space. Do not try to rescue someone who has collapsed in or near one. Call 911 immediately and let trained responders with proper equipment handle it. This site does not describe rescue methods or gas limits; use only official sources such as NIOSH and OSHA for those.

• Danger: confined space hazards can kill quickly
• Never enter a manure pit without proper training and equipment
• Do not attempt improvised rescues
• Call 911 right away

What should you do before pumping or agitating manure?

Follow written procedures from your equipment maker, your veterinarian and extension or industry safety programs. Plan the work so that people and animals are out of the building when required, and ventilate as directed.

Check the weather and make sure everyone nearby knows the plan. Do not let children or visitors be present.

Never rely on memory or habit for a job that can kill. Write the steps down, keep them where workers can see them and review them each year.

• Written procedures posted where workers can see them
• Everyone out of the building when required
• No visitors or children nearby
• Weather and wind considered before starting

How does ventilation affect safety?

Ventilation systems protect animals and workers. A power failure or equipment problem can cause conditions to change quickly. Many operations use backup power and alarms. Ask your equipment dealer and extension specialist about what suits your buildings.

Test alarms and backup systems regularly, and keep records. Never ignore an alarm.

Keep records of tests and repairs. They show patterns and help with planning.

• Test alarms and backup power on schedule
• Keep fans and inlets clean and in good order
• Have a written plan for power failure
• Train all workers to recognize an alarm and respond

What about dust, fire and electrical hazards?

Dust in confinement buildings can irritate lungs. Ask AgriSafe Network or NIOSH about respiratory health and the right protection for your work. Do not guess at respirator types.

Electrical equipment in damp, dusty buildings poses shock and fire risks. Have wiring inspected by a qualified electrician, keep exits clear and place extinguishers where people can reach them. NFPA resources and your local fire department can advise on prevention.

Ask a qualified electrician to inspect wiring in the building and to explain which equipment is rated for damp and dusty areas.

How can workers and families get trained?

Seek confined space and manure handling training from recognized sources. Extension offices, agricultural safety organizations and industry associations offer programs. Ask what is offered in your area.

If you employ workers, OSHA rules may apply to your operation. Rules vary and depend on the size and type of operation, so confirm with OSHA and your state agency. Never send a worker into a confined space without proper training.

Include family members in training, because they may be the ones to call for help if something goes wrong.

What should you do if someone collapses in a hog building?

Call 911 right away and give your address and a clear description of where the person is. Do not rush in. People have died trying to help a collapsed worker in a building or pit where the air was unsafe.

Wait for responders who have the right training and equipment. Never improvise a rescue.

• Call 911 first
• Do not enter alone
• Make sure responders can find you quickly

Last reviewed: November 12, 2026. Written by the Farm Safety Editorial Team. See our editorial policy.