Off-Grid Living in Washington County, Iowa

Washington County, Iowa is one of the more unusual counties I've researched for off-grid purposes, because it currently has no countywide zoning ordinance. The county's prior zoning ordinance was rescinded back in 2013 and never replaced. That's a big deal if you're eyeing raw land here, but it's not a blank check either, so let me walk through what I found.

Zoning and building. With no county zoning ordinance in force, Washington County's own Building & Development page states plainly that a county zoning permit is not required for buildings, additions, sheds, mobile home placement, grading, or similar activity on unincorporated land. That's the county government's own framing, not my interpretation. But this only applies outside incorporated towns. The City of Washington and other incorporated towns in the county keep their own zoning and building codes, so if your parcel is inside city limits, none of this rescinded-ordinance benefit applies to you.

Dwellings, tiny homes, RVs. Because mobile home placement is explicitly named in that rescinded-ordinance language, placing a manufactured home, tiny home, or RV on unincorporated land isn't blocked by county zoning. I couldn't confirm any Washington County-specific rule on long-term RV occupancy though, so I'd call the county's Planning & Development office before assuming anything.

Septic. Even without zoning, septic is still very much regulated. Washington County administers onsite wastewater systems under a mix of state rules (Iowa Administrative Code 567 Chapter 69) and a county ordinance, enforced through the county's Environmental Health office. This covers new installs, time-of-sale inspections, and replacements. Composting toilets fall under this same state framework as far as I can tell, but I'd confirm directly with Environmental Health since I found no county-specific composting toilet page.

Wells. Private wells are permitted, but you need a Private Well Construction Permit issued by the county health department, per Iowa DNR's statewide private well program. The county reviews your proposed site against contamination sources before approving.

Greywater and rainwater. Genuinely unclear. I found no Washington County or Iowa DNR page addressing residential greywater reuse or rainwater catchment one way or the other. Ask Environmental Health directly if either is central to your plan.

Utilities and floodplain. Living fully off municipal utilities isn't prohibited by county zoning, since there isn't any. But floodplain construction still needs a separate Floodplain Development Permit, and Iowa's statewide electrical code still requires inspection of new electrical work regardless of zoning status.

Bottom line: unincorporated Washington County is unusually permissive on paper, but septic, wells, floodplain, and electrical rules are all still live, and towns inside the county run their own separate rulebooks.