Maintenance

The core of it

• Pump on schedule — usually every three to five years, sooner for larger households.
• Clean the outlet filter if your tank has one, at each pumping.
• Keep records of every pump-out and service so you know where you stand.
• Protect the leach field — no driving, parking, or heavy structures over it.
• Watch what goes down the drain (see below).

What not to flush or pour

A septic system runs on the natural bacteria that break down waste. The fastest way to damage it is to send down things that don't belong or that kill those bacteria:

• "Flushable" wipes, paper towels, feminine products, cigarette butts
• Grease, fats, and cooking oil
• Coffee grounds, egg shells, and other kitchen solids
• Paint, solvents, drain cleaners, and harsh chemicals
• Excessive antibacterial cleaners, which harm the good bacteria

Many NH towns also discourage or prohibit garbage disposals on septic systems, since they push far more solids into the tank.

Go easy on the water

A system can only absorb so much water at once. Fix running toilets and dripping faucets promptly, spread out laundry loads across the week rather than doing them all on one day, and you'll extend the life of the leach field by not flooding it.

Your legal responsibility

New Hampshire law makes the property owner responsible for operating and maintaining a septic system so it doesn't become a nuisance or health hazard. Regular maintenance isn't just about saving money — it's the owner's duty under the state's rules.

General guidance summarized from NHDES recommendations and NH RSA 485-A:37, current as of the date shown in the footer. Not legal advice — confirm specifics with NHDES.

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