Off-grid site report

Humphreys County, TN

36.0824, -87.8331 · 476 ft elevation

Read this before you act on anything below. This is my researched starting point for Humphreys County, TN, 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 rulesHumphreys County, TN

Zoning & raw-land occupancy

Unclear - verifyNo official Humphreys County zoning ordinance or planning department page was found; zoning outside city limits is not confirmed and should be checked directly with the county. source

Dwellings, tiny homes & RVs

Varies locallyNo county-specific rule on tiny homes, minimum square footage, or RV occupancy was found; absent local rules, the state building code baseline applies by default.

Building permits & codes

Varies locallyTennessee's State Residential Building Code Enforcement Program (State Fire Marshal's Office) applies unless a county has opted out by local vote; whether Humphreys County has opted out is not confirmed. Waverly's Codes Department handles permits inside city limits. source

Septic & composting toilets

RestrictedHumphreys County is not one of the counties that runs its own septic program, so TDEC's Division of Water Resources issues Septic System Construction Permits through the regional Environmental Field Office. source

Greywater reuse

Unclear - verifyNo Humphreys County-specific greywater ordinance or health department guidance was found; state plumbing code provisions govern by default.

Rainwater harvesting

Generally allowedNo county restriction was found, and Tennessee state law does not restrict rainwater collection.

Private wells & water rights

Generally allowedWells must be drilled and equipped by TDEC-licensed professionals under the Tennessee Water Well Act, with a Notice of Intent filed before drilling; no Humphreys County-specific well ordinance was found. source

Living disconnected from utilities

Varies locallyNo Humphreys County ordinance mandating utility or sewer connection was found; the newly created Humphreys County Water Authority could affect this in the future but has no confirmed rule in force now.

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 4.9 hrs/day
Worst month (sizes an off-grid array): 3.2 hrs/day
Yearly output per 1 kW of panels: 1,351 kWh

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Weather1991-2020

Precipitation: 54 in/yr
Heating degree days: 3,954 (moderate)

How far help isstraight-line

Hospital Ascension Saint Thomas Three Rivers: 2.3 mi
Fire station: none within range
Hardware store Midwest Supply: 0.2 mi
Grocery Walmart Supercenter: 0.1 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 37185).

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.