Off-grid site report

Benton County, OR

44.5295, -123.3533 · 262 ft elevation

Read this before you act on anything below. This is my researched starting point for Benton County, OR, 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 rulesBenton County, OR

Zoning & raw-land occupancy

Varies locallyBenton County has countywide zoning; Rural Residential zones generally allow one dwelling per parcel with setback standards, while EFU/resource zones sharply restrict new dwellings and require state DLCD notice on applications. source

Dwellings, tiny homes & RVs

Varies locallyFoundation-built tiny homes fall under Oregon's building code as administered by the county; RV or wheeled tiny-home use as a permanent dwelling was not confirmed in official county sources, so ask Planning or Building directly. source

Building permits & codes

RestrictedBenton County requires building permits for most construction, reviewed under current Oregon codes; some project types are exempt, but unpermitted work can trigger county code enforcement. source

Septic & composting toilets

Generally allowedOn-site septic is required where there is no public sewer; the county's Environmental Health Division administers permitting under state DEQ delegation and requires a site feasibility study for a primary and backup system. source

Greywater reuse

Unclear - verifyNo Benton County-specific greywater rule was found; this appears to default to Oregon DEQ's statewide program, so confirm directly with DEQ.

Rainwater harvesting

Unclear - verifyNo county-specific rainwater ordinance was found; the state's general exemption for roof-catchment into a tank appears to apply, but this was not confirmed at the county level.

Private wells & water rights

Generally allowedWells for exempt domestic, lawn/garden, or small commercial use follow Oregon Water Resources Department volume caps and construction standards, echoed on the county's water supply page; all wells must be tagged at sale under OWRD's program. source

Living disconnected from utilities

Generally allowedThere's no county prohibition on going off the electric grid, but building or change-of-use permits require documenting your water source and septic system on the site plan. source

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 4.2 hrs/day
Worst month (sizes an off-grid array): 1.7 hrs/day
Yearly output per 1 kW of panels: 1,194 kWh

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Weather1991-2020

Precipitation: 67 in/yr
Snowfall: 8 in/yr
Heating degree days: 4,947 (moderate)
Frost-free season: Apr 17 to Nov 1

How far help isstraight-line

Hospital Good Samaritan Regional Medical Center: 7.1 mi
Fire station Philomath Fire & Rescue Station 201: 1.2 mi
Hardware store Marys Peak True Value: 0.8 mi
Grocery Safeway: 2.6 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 97370).

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.