Off-grid site report

Colleton County, SC

32.4902, -80.3349 · 16 ft elevation

Read this before you act on anything below. This is my researched starting point for Colleton County, SC, 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 rulesColleton County, SC

Zoning & raw-land occupancy

Varies locallyColleton County adopted a comprehensive countywide zoning ordinance (2022, updated 2023) under state enabling authority, with nine base districts; a zoning permit and site plan are required before building or establishing new uses. Incorporated towns like Walterboro have separate codes. source

Dwellings, tiny homes & RVs

RestrictedCounty ordinance caps most lots at two dwellings (houses and/or mobile homes) meeting size/width minimums; mobile homes need a county placement permit. Tiny homes on wheels and long-term RV occupancy are not addressed on official pages, so that's not confirmed, ask the zoning administrator. source

Building permits & codes

Generally allowedThe county enforces the 2021 International Building, Residential, Mechanical, Plumbing, Fuel Gas, and Fire codes plus 2009 IECC, with South Carolina modifications, and requires permits and inspections for construction. source

Septic & composting toilets

RestrictedSeptic permitting is run by the state agency (formerly DHEC, now SCDES), not the county; Colleton's building permit process requires proof of septic approval first. Composting toilets are not separately addressed by the county, not confirmed. source

Greywater reuse

Unclear - verifyNo Colleton County page addresses greywater reuse separately from septic rules, so this falls back to the state baseline; not confirmed at the county level.

Rainwater harvesting

Unclear - verifyNo county zoning, building, or environmental page addresses rainwater harvesting caps or cisterns; this inherits the state baseline and is not confirmed locally.

Private wells & water rights

RestrictedWell permitting runs through the state environmental agency (SCDES) under its well regulations; no distinct county well-permitting office was found, though county setback/floodplain rules may still apply.

Living disconnected from utilities

Varies locallyNo county rule bans disconnecting from grid power or water, but any inhabited dwelling still triggers zoning, building, and septic sign-off, making full off-the-books living difficult in practice. source

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 5.3 hrs/day
Worst month (sizes an off-grid array): 3.8 hrs/day
Yearly output per 1 kW of panels: 1,506 kWh

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Weather1991-2020

Precipitation: 45 in/yr
Heating degree days: 1,854 (mild)

How far help isstraight-line

Hospital Beaufort Memorial Hospital: 21.1 mi
Fire station Edisto Beach Fire Department: 0.5 mi
Hardware store Edisto Ace Hardware: 3.0 mi
Grocery Food Lion: 2.4 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 29438).

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 22, 2026; agencies update their layers on their own schedules. Planning data, not a survey or legal advice.