Checked against EPA SepticSmart pages and state statutes and regulations on 2026-10-07. Laws and local rules change; the current law and your local health department win.
"The average household septic system should be inspected at least every three years by a septic service professional."
"Household septic tanks are typically pumped every three to five years."
"Alternative systems with electrical float switches, pumps, or mechanical components should be inspected more often, generally once a year."
What sets your interval
EPA lists four factors: household size, total wastewater generated, volume of solids in wastewater, and septic tank size.
When the tank needs pumping
EPA says a tank should be pumped "if the bottom of the scum layer is within six inches of the bottom of the outlet, if the top of the sludge layer is within 12 inches of the outlet, or if more than 25 percent of the liquid depth is sludge and scum." It also says to "write down the sludge and scum levels found by the septic professional."
Protect the drainfield
"Do not park or drive on your drainfield."
"Keep roof drains, sump pumps, and other rainwater drainage systems away from your drainfield area."
The checklist's pumping and service log and system record sheet keep the dates, levels and companies in one place, alongside the buyer's questions and state rules at sale.
EPA's SepticSmart pages are free (epa.gov/septic), and your state or county health department is free to call. This checklist is a paid planning guide; you don't need it to buy, sell or care for a home with a septic system.