Off-grid site report
Johnston County, NC
35.6644, -78.4976 · 364 ft elevationRead this before you act on anything below. This is my researched starting point for Johnston County, NC, 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 rulesJohnston County, NC
Zoning & raw-land occupancy
Varies locallyJohnston County has had countywide zoning since 1992; most land is Agricultural-Residential, but if the parcel is in a town or its ETJ, the town controls zoning instead of the county. A new Unified Development Ordinance is in progress and could change specifics. source
Dwellings, tiny homes & RVs
Varies locallyManufactured/mobile homes and RVs are recognized use categories with their own siting rules and follow state manufactured-home setup regulations; permanent RV living outside a licensed park is not confirmed as allowed county-wide. source
Building permits & codes
Generally allowedFollows the statewide NC building code, but Johnston County requires a bundled permit package including a Land Use/Zoning Permit, well/septic permits, and utility hookup approval before construction proceeds. source
Septic & composting toilets
Generally allowedJohnston County Environmental Health administers septic permitting locally under the state's 15A NCAC 18E rules; composting toilets aren't separately addressed in county materials reviewed, so state baseline likely applies, but that's not confirmed. source
Greywater reuse
Unclear - verifyNo county-specific greywater ordinance was found; it inherits the state wastewater framework under G.S. 143-350 and would be handled through Johnston County Environmental Health's on-site wastewater permitting process.
Rainwater harvesting
Generally allowedState law bars any state, county, or local building code from prohibiting cistern use, and the NC Building Code has a rainwater recycling appendix; no additional Johnston County restriction was found. source
Private wells & water rights
Generally allowedJohnston County has run its own local well rules since the early 1970s under NC General Statutes Chapter 130A-39, covering drinking, semi-public, and irrigation wells, administered by Environmental Health. source
Living disconnected from utilities
RestrictedCounty practice ties permanent power hookup to passing all inspections and receiving a Certificate of Occupancy, which itself requires an approved well/septic or public water-sewer connection; status for unoccupied structures without any hookups is not confirmed. source
Sun30-year normals
- Peak-sun hours, annual average
- 5.2 hrs/day
- Worst month (sizes an off-grid array)
- 3.9 hrs/day
- Yearly output per 1 kW of panels
- 1,452 kWh
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Weather1991-2020
- Precipitation
- 46 in/yr
- Snowfall
- 3 in/yr
- Heating degree days
- 3,540 (moderate)
- Frost-free season
- Apr 5 to Nov 2
How far help isstraight-line
- Hospital
Cherry Hospital - 32.7 mi
- Fire station
Raleigh Fire Station Number 10 - 8.4 mi
- Hardware store
Ace Hardware - 7.7 mi
- Grocery
Compare Foods - 2.5 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 27528).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in Johnston County, NC?The rules above are the jurisdiction. The land check runs the parcel itself: flood zone, soils and septic suitability, wetlands, slope, access, climate, and these verdicts, from a parcel number or coordinates.
Check a parcel →Share or save this report:New report
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.
New here, or not sure where this fits? Start here walks through the whole thing in order.