Off-grid site report

Harrison County, MS

30.4225, -89.0912 · 30 ft elevation

Read this before you act on anything below. This is my researched starting point for Harrison County, MS, 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 rulesHarrison County, MS

Zoning & raw-land occupancy

Varies locallyHarrison County has countywide zoning under its Unified Development Code, administered by the county Office of Zoning; the A-1 Agriculture District (15+ acres) is most permissive for off-grid uses, but other districts are more restrictive. Incorporated cities within the county have their own separate zoning. source

Dwellings, tiny homes & RVs

Unclear - verifyMobile/manufactured homes go through a defined county permit process tied to septic approval, but whether tiny homes on wheels can be occupied full-time outside RV parks is not confirmed in official county sources. Confirm with Code Administration. source

Building permits & codes

RestrictedHarrison County Code Administration requires soil evaluation and septic certificates as part of the building/mobile home permit process, and power hookup is withheld until final septic certification is filed. source

Septic & composting toilets

Generally allowedSeptic systems are permitted through the Harrison County Health Department (for lots under three acres) under Mississippi State Department of Health on-site wastewater rules; soil evaluation and final inspection certificates are required. source

Greywater reuse

RestrictedNo Harrison County-specific greywater ordinance was found; greywater disposal appears to fall under the same state/county wastewater permitting as septic systems. source

Rainwater harvesting

Generally allowedNo Harrison County ordinance restricting rain barrels or cisterns was found, so the general state allowance applies.

Private wells & water rights

Generally allowedPrivate wells are permitted; the Harrison County Health Department handles water sampling, and drilling follows state licensing requirements. No additional county-specific well ordinance was found. source

Living disconnected from utilities

RestrictedThe county's permitting workflow ties final power hookup to septic certificate approval by Code Administration, meaning the system is built around eventual grid connection, though this doesn't explicitly ban solar generation. source

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 5.4 hrs/day
Worst month (sizes an off-grid array): 4.2 hrs/day
Yearly output per 1 kW of panels: 1,526 kWh

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Weather1991-2020

Precipitation: 65 in/yr
Heating degree days: 1,628 (mild)
Frost-free season: Feb 27 to Dec 4

How far help isstraight-line

Hospital Singing River Gulfport: 1.5 mi
Fire station Gulfport Fire Department Station 12: 1.4 mi
Hardware store The Home Depot: 0.5 mi
Grocery Walmart Supercenter: 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 39502).

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.