By Granite Trusted Pros · Last updated October 16, 2026
What does NHDES recommend?
On its Get Pumped! New Hampshire page, NHDES says "Septic tanks should be pumped every three to five years for optimal function," and tells homeowners to contact an NHDES-licensed septage hauler. EPA gives the same range for household tanks: "typically pumped every three to five years."
You may also see an older NHDES fact sheet from 2011 that says to inspect your tank every year and pump at least every two to three years. The current NHDES page says three to five years. If your last pumping was a while ago, a pro can tell you where your tank stands.
What changes how often you need to pump?
EPA lists four things: household size, total wastewater generated, the volume of solids in the wastewater, and septic tank size. Both NHDES and EPA say a garbage disposal means more frequent pumping. NHDES also suggests fixing leaky faucets and toilets and spacing out laundry loads to go easier on the system.
How do you know it is time?
The best way is to have a pro look. EPA says that during a service visit the pro will inspect for leaks and examine the scum and sludge layers, and it suggests writing those levels down to track when to pump next. The older NHDES fact sheet says to pump when sludge and scum together reach one third of the tank's liquid depth. EPA also says systems with electrical float switches, pumps or other mechanical parts should be inspected more often, generally once a year.
How much does septic pumping cost in NH?
NHDES says you can expect to pay $350 to $500 every three to five years for regular maintenance, and that replacing a typical residential leach field after a failure can cost around $25,000 or more. Those are NHDES's figures; actual prices vary by company and tank, so ask for a quote.
Does pumping matter when you sell your home?
NHDES notes that home and septic inspections are part of most real estate transactions in New Hampshire, so a record of regular maintenance helps.
Where can I find a septic company near me?
Our septic service directory lists local septic pumping and service companies in Milford, Nashua, Bedford, Merrimack, Amherst, Manchester, Concord and nearby towns, with phone numbers you can call directly. Ask any company to confirm it is an NHDES-licensed septage hauler.
Frequently asked questions
How often should a septic tank be pumped in New Hampshire?
NHDES says every three to five years for optimal function. Your household may need it more or less often depending on household size, water use, tank size and garbage disposal use.
How much does septic pumping cost in NH?
On its Get Pumped! New Hampshire page, NHDES says you can expect to pay $350 to $500 every three to five years for regular maintenance. Prices vary, so ask a few licensed haulers for a quote.
Does a garbage disposal mean more pumping?
Yes. NHDES says waste from garbage disposals fills your system more rapidly and requires more frequent pumping, and EPA says the same.
Who can pump my septic tank in NH?
NHDES says to contact an NHDES-licensed septage hauler, and it publishes a list of approved haulers.
Is a septic inspection the same as pumping?
No. Pumping empties the tank. EPA says a household system should be inspected by a septic service professional at least every three years, and the pro will check for leaks and look at the scum and sludge layers.
Sources
- NHDES: Get Pumped! New Hampshire
- EPA: How to Care for Your Septic System
- NHDES fact sheet WD-SSB-13, You and Your Septic System (2011, copy hosted by the Town of New London)
This guide is general information, not professional advice. Talk to a licensed pro about your own system.