How to maintain a leach field
Short answer
Maintain a leach field by keeping the tank pumped, limiting water use and fixing leaks. Keep vehicles, trees and roof runoff away, and keep grass over the field. Mow it, but don't fertilize or water it. Have the system inspected at least every three years, and check the field for wet spots.
Day to day, a leach field asks very little of you. What it needs is protection: from solids, from excess water and from weight.
What does leach field care involve?
Keep solids out
- Pump the tank on schedule. Our pumping calculator gives a rough interval.
- Have the system inspected at least every three years, as the EPA advises.
- Flush only human waste and toilet paper.
- Go easy on the garbage disposal.
Limit water
- Fix leaks. According to the EPA, one running toilet can add as much as 200 gallons a day.
- Spread laundry across the week, and run full loads.
- Send roof drains and sump pumps away from the field.
Protect the ground
- Keep vehicles and heavy equipment off the field.
- Don't build on it or pave over it.
- Keep trees and shrubs away, and ask a professional about safe distances for your system.
- Protect any repair area from digging and construction.
Look after the surface
- Keep grass or other shallow-rooted cover over the field.
- Mow it, but don't fertilize or water it, as the University of Minnesota advises.
- Don't dig below 6 inches, a warning from University of Florida Extension.
- Skip mulch, vegetable gardens and added soil.
What should you check?
| When | What to do |
|---|---|
| After heavy rain | Look for soggy ground, and reduce water use until it dries |
| Yearly | Check for burrowing animals and damaged inspection pipes |
| At each pumping | Have the field looked at |
| Every 3 years or sooner | Have the system inspected |
Ground that stays saturated with no clear cause is a different matter. The University of Minnesota warns it can point to a long-term problem, so contact a licensed professional.
Do you need additives or cleaners?
No. The EPA says additives aren't needed for a system to work properly on household wastewater. The routine care that counts is pumping.
Quick answers
Can you plant grass over a leach field?
Yes. Penn State Extension calls turf grass the safest choice because its roots are shallow.
Can you walk on a leach field?
The University of Minnesota advises keeping all foot and vehicle traffic off the tank, pipes and field.
Rules vary by location
Your county may have its own inspection and maintenance rules. Check with your local health department.
Sources
- How to Care for Your Septic System, US EPA
- Care and maintenance, University of Minnesota Onsite Sewage Treatment Program
- Septic System Owner's Guide (AG-439-22), NC State Extension
- Five Basic Practices to Protect Your Septic System, Penn State Extension
- Landscaping on or near Septic Drain Fields, University of Florida IFAS Extension
Read next
-
How long does a leach field last?
Many leach fields last 20 years or more with good care, but there's no fixed lifespan. See what sources say and what shortens the life of a field.
-
How often should you pump a septic tank?
Most household septic tanks are pumped every three to five years. See what changes that schedule and how to tell when your own tank is due.
-
Signs of a clogged leach field and what to do
Slow drains, soggy ground and sewage smells can point to a clogged leach field. See the causes, what to do first and why pumping may not fix it.