How Often Should You Pump a Septic Tank in Westchester and Putnam?
Updated 2026-10-06
If your home in Northern Westchester or Putnam County is on a septic system, pumping the tank is the cheapest thing you can do to protect it. It is also, in Westchester, the law. Here is how often to pump, what the rules are in each county, and how to tell when you are overdue.
The short answer
Most households should pump every 2 to 4 years. Westchester County sets a legal maximum of 5 years between pump-outs, and many Putnam towns have their own schedules. Smaller tanks, bigger households and garbage disposals all push the schedule shorter.
Westchester County: at least every 5 years
Westchester County law requires septic tanks to be pumped at least once every five years. Since 2011, septic companies have had to report every pump-out to the county Health Department, so the county keeps a record of when each property was last pumped, and that status is visible on the county's GIS mapping system (Truesdale Lake Property Owners Association). Keep your receipts in case the county asks.
The county's Septic System Management page lists licensed septic contractors and collectors, and explains the rules contractors follow. If you pay Westchester County sewer tax but your home is on septic, you may be able to get reimbursed for septic maintenance through the county Department of Environmental Facilities.
Putnam County: it depends on your town
Most homes in Putnam County rely on septic systems rather than public sewers, and each town in Putnam has its own local law about pumping. The Putnam County Department of Health recommends routine inspection and pumping every three to five years (Putnam County DOH). Check with your town building or health office for the exact schedule where you live.
Homes in the New York City watershed, and around water bodies the state lists as impaired such as Lake Oscawana in Putnam Valley, fall under additional septic rules. If your system needs repair, Putnam requires a county-licensed contractor unless you do the work yourself.
Why small lake-community tanks need more frequent pumping
Many cottages around Lake Mahopac, Lake Carmel, Putnam Lake and the Lewisboro lakes were built as summer homes with small tanks, some around 250 gallons. Once those homes became year-round, the tanks started filling much faster than they were designed for. Some of the smallest need pumping once a year. If you are not sure of your tank size, ask the pumper to note it on your receipt next time.
Signs you are overdue
- Slow drains in more than one sink, tub or toilet
- Gurgling sounds in the pipes after flushing
- Sewage odor near the tank or over the drain field
- Wet, spongy ground or unusually green grass over the field
- Sewage backing up into the lowest drain in the house
If sewage is coming up into the house, stop running water and call for emergency septic service. Do not open the tank yourself: the gases inside are dangerous.
What happens if you wait too long
A septic tank holds the solids that bacteria cannot break down. When it fills, those solids flow out into the drain field and clog the soil. A pump-out is routine maintenance. A clogged drain field can mean drain field repair or replacement, which is one of the most expensive repairs a septic owner can face, and in watershed areas it usually needs an engineered design and county approval.
What a good pump-out includes
- Pumping both compartments of the tank, not just the inlet side
- A check of the inlet and outlet baffles
- Cleaning the effluent filter, if your tank has one
- A written receipt with the date, tank size and anything unusual the crew noticed
Need a pump-out?
We connect homeowners in Northern Westchester and Putnam County with an independent, county-licensed septic company. Call or request a quote and tell us your town. See septic tank pumping for more on what the service involves.
Sources: Westchester County Department of Health, Putnam County Department of Health, EPA SepticSmart.