Managing Runoff from Barns and Pens

Why does barn and pen runoff matter?

Manure carries nutrients and bacteria. When runoff reaches a stream, pond or well area, it can harm water quality, cause algae growth and create health risks. Mud around buildings also wears on animal feet and hooves and makes chores harder.

Even small farms can create problems because animals concentrate in a small area.

Where the runoff goes matters as much as how much there is. A pen draining to a grassy slope that slowly soaks it up is very different from one draining straight to a ditch. Knowing the distance to streams, ponds, wells and neighbors helps you decide how much attention the site needs first.

How do I see where water goes?

Walk the property during a rain. Watch how water moves off roofs, across lots and toward low spots, and mark where it pools or cuts channels. Note how far these paths are from wells, streams, ponds and property lines.

Take photos and make a rough sketch. This map guides every other decision.

Soil type and slope change what works. Sandy ground drains quickly and can carry nutrients down toward groundwater, while heavy clay sheds water and forms mud. A look at your soil map and a talk with your NRCS office help you choose measures that fit your ground.

How do I keep clean water out of the animal area?

Gutters and downspouts on barns move roof water away from pens. Diversion swales or berms above the pen can steer upslope water around it. Directing clean water elsewhere shrinks the amount that needs managing.

Keep the diverted water on stable, vegetated ground so it does not create a new erosion problem.

Keep the number of animals in line with the space. Crowding is a main reason pens turn to mud and generate runoff. If you cannot give animals enough room for the wet season, think about a smaller herd, a sacrifice area with firm footing or rotating animals through more space.

• Add or repair gutters and send downspouts to a stable outlet.
• Divert upslope water around heavy-use areas.
• Keep animals and stored manure away from wells and streams.

How do I reduce mud and manure loss in pens?

A heavy-use pad of firm material gives animals a dry place to stand near gates, feeders and waterers. Rotate or rest paddocks so grass stays dense, since vegetation filters runoff. Scrape and remove manure regularly instead of letting it pile in the open.

Fix leaking waterers and troughs. A small constant drip creates a permanent mud patch.

Vegetated filter strips below pens and lots can slow and filter water. They need to be wide enough, kept in grass and not overloaded, and they do not work well on frozen or saturated ground. Ask your conservation district what width and plants suit your area.

How should I store and use manure?

Store it on a surface and in a spot that keeps it dry and away from water. Cover or contain piles where possible. Compost it if you can, and spread only on ground that can use the nutrients and not on frozen, saturated or sloping ground.

Have soil tested before spreading so you apply to the crop's needs. Rates and timing rules for manure vary by state and county.

Composting is one option for managing manure. A compost pile needs the right mix of materials, moisture and turning, and it should sit on a firm base away from water. Ask your extension office for a local guide, and keep track of volumes so storage does not overflow in wet weather.

Are there rules or help available?

Possibly. Water quality and animal feeding rules are set at state and local levels and vary with herd size, location and distance to water. Contact your state department of agriculture or environmental agency and your county zoning office to ask what applies to you.

Your local NRCS office and conservation district can help with a plan and may offer technical or cost-share assistance. Ask early, before you build anything.

What can I do this month without spending much?

Start with the free steps. Walk the site in rain, clear clogged gutters, fix leaking waterers, move feeders away from low spots and scrape manure from areas where water flows. Each reduces the load on your site without building anything.

Next, write a short list of larger projects in priority order, such as gutters, a heavy-use pad or a manure storage area, and ask your NRCS office about assistance. A staged plan lets you spread cost across seasons and fix the worst problem first.

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