Cesspool Companies in Suffolk County

Out here a cesspool in the yard is ordinary, and the county’s own count shows it. A 2024 Suffolk Times report, using figures from the county’s 2020 wastewater plan, counted about 365,000 home onsite systems in the county, and 252,530 of them were cesspools with no septic tank in front.

All that wastewater soaks down toward the same groundwater people drink. The U.S. Geological Survey says that in Suffolk, the return of household wastewater to the groundwater through septic systems is a particular concern for the aquifer.

What Suffolk lets you put in

Swapping a dead cesspool for a fresh one has been off the table in Suffolk since July 2019, when the county closed the old in-kind loophole, per The East Hampton Star. Any replacement now goes through the health department first, and it has to include a septic tank. New houses, and the biggest renovations, have needed a nitrogen-reducing unit since July 2021. The installation page lays out each rule and its date.

For permitting questions, the county’s Office of Wastewater Management is at 631-852-5700.

The license to look for

Suffolk licenses cesspool and septic work through its Department of Consumer Affairs under Chapter 563 of the county code. Every company should hold a liquid waste license with the endorsement for your job. Search any company below on the Suffolk license search by choosing “Liquid Waste License.”

Grants and town rebates

Between the county program and the state fund, a qualifying Suffolk homeowner can get as much as $45,000 toward a nitrogen-reducing system, the figure county officials gave when the new online application opened in August 2026. The work has to be done by a company from the county’s own installer list. Three East End towns add rebates of their own; the questions below have the county’s phone numbers for each.

The companies below are grouped by the town their office is in.