Off-grid site report

Suffolk County, NY

40.9452, -72.8424 · 115 ft elevation

Read this before you act on anything below. This is my researched starting point for Suffolk County, NY, not legal advice and not a guarantee. Rules change, and the deciding facts on any specific parcel (setbacks, perc results, overlay districts, deed restrictions, road frontage) live at the county or town office, not in any database. Before you buy land or build, confirm the current rules directly with the local zoning and health offices - the sources on this page tell you exactly who to call.

The local rulesSuffolk County, NY

Zoning & raw-land occupancy

Varies locallySuffolk County has no zoning code of its own; each of the ten towns (and villages within them) sets its own zoning rules. The County Planning Commission only reviews/refers certain town zoning actions. source

Dwellings, tiny homes & RVs

RestrictedNo county-level standard for tiny homes, RVs, or alternative dwellings; enforcement happens at the town level, and towns like Brookhaven have used the courts to remove non-compliant structures. Confirm with your specific town's building department.

Building permits & codes

RestrictedBuilding permits are issued by each town under the NYS Uniform Fire Prevention and Building Code; Southold, for example, requires plans sealed by a licensed engineer or architect. Suffolk County has no separate countywide building code. source

Septic & composting toilets

RestrictedSuffolk County Department of Health Services administers Article 6 of the Suffolk County Sanitary Code, requiring approved sewage disposal systems, with nitrogen-reducing I/A OWTS mandated in many new-construction or replacement cases since 2017-2019. Only county-licensed Liquid Waste contractors can perform the work. source

Greywater reuse

Unclear - verifyNo official Suffolk County page specifically permits or regulates residential greywater reuse; it's only addressed as part of septic hydraulic-load design. Confirm directly with SCDHS Office of Wastewater Management.

Rainwater harvesting

Unclear - verifyNo Suffolk County-specific residential rainwater harvesting permit rule was confirmed; the county's stormwater program focuses on construction/municipal systems. Follow the NYS baseline and check your town code for storage or setback rules. source

Private wells & water rights

Generally allowedPrivate wells follow NYS DOH standards, but Suffolk County adds groundwater protection under Article 7 of its Sanitary Code, including Deep Recharge Area rules and required separation distances from septic systems. Much of the county is served by Suffolk County Water Authority public water instead. source

Living disconnected from utilities

Varies locallyNo countywide rule requiring electric grid connection was found, but the Sanitary Code requires connecting to county sewer and discontinuing a private septic system once county sewer becomes available to a property. Electrical disconnection rules are town-dependent and not confirmed at the county level. source

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 4.8 hrs/day
Worst month (sizes an off-grid array): 3.0 hrs/day
Yearly output per 1 kW of panels: 1,372 kWh

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Weather1991-2020

Precipitation: 48 in/yr
Snowfall: 28 in/yr
Heating degree days: 5,032 (moderate)
Frost-free season: Apr 8 to Nov 8

How far help isstraight-line

Hospital Peconic Bay Medical Center: 8.8 mi
Fire station Rocky Point Fire Department: 4.3 mi
Hardware store Ace Hardware: 0.2 mi
Grocery King Kullen: 0.2 mi

From OpenStreetMap. Road miles will be longer, often much longer in hill country.

Plan this spot

These open with this location's real numbers already filled in (ZIP 11792).

Size a solar system Heat loss & insulation Firewood per winter Rainwater harvest Garden size Panel tilt

Sources: US Census Bureau geocoder; NLR PVWatts v8 (solar); NOAA NCEI 1991-2020 climate normals (nearest station) or Open-Meteo (ZIP-centroid) for weather; Open-Elevation; OpenStreetMap contributors. Public data retrieved Aug 21, 2026; agencies update their layers on their own schedules. Planning data, not a survey or legal advice.