Short answer: Nassau's health department puts Muttontown among the North Shore communities without public sewer. Nassau's S.E.P.T.I.C. grant for eligible nitrogen-reducing upgrades is up to $35,000 per its administrator (details below).
Muttontown in numbers
| Town | Town of Oyster Bay |
|---|---|
| Status | Incorporated village |
| Area | 6.08 sq mi |
| Sewer (county list) | Not publicly sewered |
| Parcels / median parcel | about 1,479 / 2.00 ac |
| Building permits | Village of Muttontown |
Area and parcels computed 2026-11-07 from Nassau County GIS (place boundary; all tax parcels touching it, any use). Sewer status from the Nassau County Department of Health list of sewer districts by community, which is by community, not street.
Sewer status and lots
Nassau's health department puts Muttontown among the North Shore communities without public sewer. About 1,479 tax parcels touch Muttontown's 6.08 square miles, with a median of 2.00 acres (about 87,000 sq ft). That is the 11th-largest median parcel of the 133 Nassau places we measured, so most lots have room for a replacement system and its setbacks to plan around. Nearby: Syosset (on public sewer, median parcel 0.20 ac); Brookville (not publicly sewered, median parcel 2.04 ac); East Norwich (not publicly sewered, median parcel 0.23 ac).
Grant and permits
Because the county lists Muttontown outside public sewer, its homes fall in the area Nassau's S.E.P.T.I.C. grant was designed for, subject to the program's property test. Permits come from the Village of Muttontown; the contractor needs a Nassau County Home Improvement License, and no county rule we found requires an I/A system for an existing home.
For Muttontown properties, Nassau grant amount and no-stacking details are on the Nassau County overview and Long Island grants guide.
Who handles what in Muttontown
- Building permits: Village of Muttontown
- S.E.P.T.I.C. grants: 516-364-5861 ([email protected])
Frequently asked questions
Is Muttontown on public sewer?
Nassau's health department puts Muttontown among the North Shore communities without public sewer.
Who issues permits for septic work in Muttontown?
The Village of Muttontown building department, with a contractor holding a Nassau County Home Improvement License.
Rules and grant steps: Town of Oyster Bay overview, Nassau regulations, S.E.P.T.I.C. details. More nearby: East Norwich, Oyster Bay Cove, Old Westbury, Locust Valley.
Sources
Each source was re-read on November 7, 2026. Program amounts and rules change; the agency page is the authority.
- Nassau County DOH: Public sewer districts by community
- Nassau County GIS map service (place boundaries, tax parcels)
- Nassau County Soil & Water Conservation District: S.E.P.T.I.C. program (program administrator)
- Nassau County: S.E.P.T.I.C. program
Need cesspool or septic work in Muttontown?
Submit a request with your address. We match it to an independent operator with a Nassau County Home Improvement License who serves that address; the operator confirms the time and price with you.
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