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Lagoon Warning Signs

A lagoon can look like a calm pond to a visitor, a child or a new employee. Warning signs are the first and cheapest layer of protection, and they only work if people can see and understand them.

Why does a farm lagoon need warning signs?

Many people cannot tell a waste storage lagoon from a pond or a field puddle. The surface may look solid, shallow or even inviting, especially when a crust forms or vegetation grows near the edge. A sign tells a stranger, a delivery driver or a child that this is not a place to walk, play or retrieve something that fell in.

Signs also support the people who work on the farm every day. Familiarity can make a hazard fade into the background, and a visible sign is a steady reminder, particularly for seasonal help and family members who are home only part of the year.

What should a lagoon sign say?

A useful sign is short, plain and readable from a distance. It names the hazard in a few words, says who is affected, and tells people what to do, which is to keep out. Use the word Danger or Warning as a label, then the message, and add a simple picture so that readers who do not read English or who are very young still understand.

Wording and format vary, and some sign designs follow recognized standards. Ask your extension office or OSHA for the guidance that applies to signs and safety colors before you buy or make anything, rather than copying a design from memory.

• Name the hazard in plain words, such as deep liquid waste.
• Add a picture symbol alongside the text.
• Include a second language if workers or neighbors speak one.
• Keep the message to what people must do: stay out and stay back.

Where should the signs go?

Place signs where a person would actually approach: gates, access lanes, the end of a farm road, and any point where someone could walk to the edge. A sign hidden behind equipment or far from the path does nothing. Walk the approach as a stranger would, from the public road and from the yard, and note every spot where you could reach the bank without passing a sign.

Consider the viewing angle, the height of the sign and whether it can be seen in low light, fog or snow. Signs facing the lagoon may be useful, but the main purpose is to stop people before they get there.

Are signs enough on their own?

No. A sign warns, but it does not physically stop anyone. Fencing, locked gates and controlled access are the next layers, and the right combination depends on your site, your state and local rules, and who comes onto your property. Your state environmental or agriculture agency and your extension office can tell you what is required where you farm.

Think about the gases that can come from stored manure and wastewater. Describe them only in general terms to your crew: the air near storage can be hazardous and no one should go near the edge or into related structures without proper training and equipment. Specific limits and procedures come from OSHA, NIOSH and trained professionals, not from a sign or from memory.

How do you keep signs working over time?

Weather fades, cracks and bends signs. Sun, ice, mowing equipment and livestock all take a toll. Add sign checks to a regular walkthrough, and replace anything that is faded, damaged, covered by weeds or knocked down. A missing sign is a gap in your protection even if no one has noticed yet.

When something changes, such as a new access road, a new building or a change in who visits, review whether the sign locations still make sense. Update the signs when you update the farm.

• Check signs when you check the fence.
• Replace faded or missing signs right away.
• Trim vegetation that hides a sign.
• Review placement after any change in layout.

How do you talk about the lagoon with family and workers?

Signs support conversation but do not replace it. Explain to every new worker, relative and regular visitor where the lagoon is, why it is dangerous and what the rule is. Children need a clear, simple, repeated message: this is never a play area. Give the same message to teens who help with chores, and to anyone who might be tempted to cut across the property.

If someone or something falls in, do not attempt a rescue on impulse. Call 911 right away and follow the guidance of emergency responders. Recognized hands-on training from an official source is the right way to learn what to do before an emergency, and your local fire department can point you to it.

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