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Loaders, Excavation & Property MaintenanceWorking Around Septic Systems
A septic system is buried and easy to forget, until a tractor crushes a pipe or compacts the drain field. Know where it is before you move any equipment.
Key points
- Locate and mark the tank, lines and drain field.
- Keep heavy equipment and livestock off the system.
- Ask the county before grading, filling or building nearby.
- Never enter or lean into a septic tank.
- Call a licensed septic professional for repairs.
How do you find your septic system?
Start with paperwork. Your county health department or the person who built the system may have a drawing. Look for access lids, cleanout caps and vent pipes. A septic professional can locate the tank and field for a fee, and 811 will not mark them because they are private.
Mark the tank, the lines and the drain field with stakes or flags, and record the layout on a sketch you keep with your property papers. Many counties also keep permit files on file with a drawing, tank size and installation date. Ask the health department or environmental office if you can get a copy, and request it before you plan any new work on the property.
What parts of the system are most sensitive?
The drain field is the most vulnerable. Soil there needs to stay loose enough to absorb and treat water. Heavy equipment compacts the soil and can crush pipes. Tanks and lids can fail under loads they were not built for, especially older concrete or plastic ones.
Keep tractors, trucks, trailers and livestock off the field and tank area. Do not park equipment on it, and do not store heavy loads there. A lid that has settled, cracked or become loose is a sign of trouble. Keep people and animals away from it and call a professional right away, since a collapsed lid can drop someone into a tank. Plastic and concrete lids vary in strength, and many are not meant to carry vehicles.
- Tank and lids: keep vehicles off
- Drain field: avoid compaction and grading
- Pipes: shallow lines can be crushed
- Vents and risers: mark and mow around
Can you mow or grade near a drain field?
Mowing with a light machine is usually fine, but heavy machinery and repeated passes in wet conditions are not. Grading, filling and digging over the field can change how it works and may violate local rules. Ask your county health department before you change the surface.
Keep trees and large shrubs away, since roots seek out water and can clog lines. Use grass for cover. If you graze animals nearby, fence them off the field when soil is wet, since hooves compact and tear sod. Let the grass grow to a moderate height, because healthy sod helps the field use water and take up nutrients.
What if you need to dig or build nearby?
Projects like fences, outbuildings, ponds and driveways need setbacks from septic components, and rules vary by county and state. Check with your local health department before you design the work. Mark the system and hand dig if you must work close.
Never dig into the tank or open lids without proper training. Septic tanks can hold dangerous gas and are a confined space hazard. Plan driveways and equipment routes so they stay well clear of the system. If a contractor will bring in a concrete truck or a dump truck, show them the layout and mark the no-drive zones clearly with stakes or flags before they arrive.
What are the safety hazards?
Gas from a tank can be toxic or explosive. Do not lean into a tank, and never climb in. A collapsed lid or soft ground over a tank can drop a person or a machine. Keep children away from the area and keep lids secure.
Use ROPS and the seat belt, avoid driving over soft ground, and walk the area before you work. Never use an open flame or a lit cigarette near a septic opening, and do not lean over a tank to look. If a lid must be opened for pumping, let the professional do it with the right equipment and training.
What signs mean the system needs attention?
Slow drains, gurgling, odors, wet spots or unusually green grass over the field are warning signs. Stop using heavy equipment in the area, and call a licensed septic professional. Ask your health department what inspection and pumping advice fits your system and your household. Heavy use, such as lots of laundry in one day or a houseful of guests, can overload a system. If you rent a cabin on the property, ask your professional about advice for the number of people the system can serve.
When should you call a professional?
Call a licensed septic professional for locating, inspection, pumping, repair and any plan that changes the ground over the system. Check local permit rules before the work begins. Before you sell or buy a property, many lenders and counties ask for an inspection. Ask the health department what is needed in your area.
Sources and further reading
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