Off-grid site report

Warren County, MO

38.8056, -91.1352 · 833 ft elevation

Read this before you act on anything below. This is my researched starting point for Warren County, MO, 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 rulesWarren County, MO

Zoning & raw-land occupancy

RestrictedWarren County adopted countywide zoning under its Zoning Order, most recently updated with a 2012 map, covering unincorporated land. Towns inside the county set their own separate zoning that overrides the county rule within city limits. source

Dwellings, tiny homes & RVs

Varies locallyThe county requires a permit for all structures regardless of size, and distinguishes manufactured homes from RVs, but no official minimum dwelling size or RV-residency rule was confirmed. Ask Planning & Zoning about tiny homes or RV living specifically. source

Building permits & codes

RestrictedWarren County requires a structure permit for any building project, but official adoption of a specific model building code countywide is not confirmed. Warrenton, as a city, has adopted International Code Council codes within its own limits. source

Septic & composting toilets

RestrictedThe Warren County Sanitarian's office requires a permit, soil evaluation, and final inspection for any on-site septic system, under state minimum standards set by Missouri DHSS. Composting toilets are not addressed in any official source found, so that's unconfirmed, check with the Sanitarian. source

Greywater reuse

Unclear - verifyNo Warren County or Missouri DHSS/DNR source specifically addresses greywater reuse. Not confirmed, contact the Warren County Sanitarian's office for local policy.

Rainwater harvesting

Generally allowedNo Warren County ordinance restricting rainwater harvesting was found, which means it falls under Missouri's general allowance for landowners to collect rainwater absent a local rule against it.

Private wells & water rights

RestrictedPrivate wells in Warren County are governed by the state's Water Well Drillers Act and Missouri DNR's Well Construction Rules, which generally require a permit to construct or repair a well, though landowners can self-install under the law. source

Living disconnected from utilities

Generally allowedUnincorporated Warren County doesn't require a Certificate of Occupancy, but hooking up electric service requires a Permanent Electric Sticker that's withheld until your septic system passes final inspection. No rule found mandates connecting to public water or sewer where none is available. source

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): 3.3 hrs/day
Yearly output per 1 kW of panels: 1,395 kWh

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Weather1991-2020

Precipitation: 42 in/yr
Heating degree days: 5,162 (moderate)
Frost-free season: Apr 15 to Oct 19

How far help isstraight-line

Hospital SSM Health Saint Joseph Hospital: 13.8 mi
Fire station Warrenton Fire Protection District Station 2: 1.2 mi
Hardware store Marthasville Do It Best Lumber: 12.3 mi
Grocery Schnucks: 1.1 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 63380).

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.