Building permits, zoning and septic rules in Washington County, Iowa

Washington County has not adopted building codes, so a building project in unincorporated Washington County does not need a county building permit^1,10. Owner-builders may build their own homes because there is no county building permit from which to obtain an exemption, although state trade-licensing rules can still apply¹. A project in the mapped floodplain needs a Floodplain Development Permit, and county officials may enter the property for permit and compliance inspections^6,14. A new or changed entrance onto a county road also needs a driveway permit⁷. Land within two miles of an incorporated city may be subject to that city's building or zoning requirements, so contact the city before relying on the county rule¹⁰. Inside Kalona, building erection, moving, additions and structural alterations require a city building permit; private septic and well approvals still go through Washington County Environmental Health^3,5,8.

Washington County has no general building-permit counter because the county has not adopted building codes¹⁰. Washington County Planning & Development, at the courthouse, publishes rural building guidance and administers subdivision review¹⁵. Washington County Environmental Health handles floodplain development permits and well or septic questions, while Engineering & Secondary Roads handles new entrances onto county roads^6,16. Floodplain projects are the inspection exception: county officials may inspect the property while reviewing the application and checking compliance¹⁴. New electrical work remains subject to state inspections and contractor licensing even without a county building permit¹⁰.

Washington County has no current county zoning districts or county zoning permits for unincorporated land because its former zoning ordinance was rescinded in 2013². Unincorporated Washington County therefore has no county zoning minimum for dwelling size, no county zoning setbacks, no county lot-coverage cap and no county zoning building-height limit². County zoning also sets no minimum lot size in unincorporated Washington County². Subdivision review, septic approval, floodplain rules and driveway permits can still shape a project^3,7,11,12. A city may enforce its own rules on land within two miles of its limits, so ask that city before buying or building there¹⁰. Inside Kalona, the city administers its own zoning; Washington County Environmental Health remains the contact for private septic systems and wells^3,5,9.

Washington County Environmental Health is the local authority for private septic systems; Iowa requires a construction permit before installing or altering a private sewage disposal system, and new systems need a final inspection before backfilling^3,4. Repairs that do not change treatment or disposal are not treated as alterations, but discharge restrictions still apply⁴. Washington County has 0% of soils rated “not limited” for a conventional drain field; get a site evaluation rather than assuming a standard system will work, and allow for an engineered alternative if needed¹⁷. Washington County Environmental Health also issues household private-well permits⁵. Construction or reconstruction of a nonpublic water-supply well 20 feet or deeper needs approval before work begins; replacement wells and physical-dimension modifications also require a permit¹⁸. The state rule lists a $125 standard fee but allows delegated counties to set a different fee, so ask Environmental Health for Washington County’s charge^6,18. Iowa generally requires a certified septic inspection before a qualifying property transfer, with the report valid for 2 years¹⁹.

RV occupancy on private land in unincorporated Washington County has no county zoning restriction, but floodplain, septic, nuisance, state and nearby-city rules can still apply¹³. Temporary camping likewise has no county zoning restriction there¹³. The same county-zoning answer applies to tiny homes, manufactured homes and accessory dwellings on private land^10,13. Iowa law adds that a county may not disallow a manufactured home solely because it is a manufactured home, where county zoning applies²⁰. An RV in the regulated floodplain avoids factory-built-home anchoring and elevation requirements only when it stays for less than 180 consecutive days, remains fully licensed and is ready for highway use¹¹. Longer placement or an RV that is not highway-ready must meet the ordinance's anchoring and elevation requirements¹¹. Contact Environmental Health about sanitation and floodplain limits, and ask the relevant city about land within two miles of its limits^6,10.

1. Confirm that the parcel is in unincorporated Washington County, where building projects need neither a county building permit nor a county zoning permit^1,2.
2. If the parcel is within two miles of an incorporated city, ask that city whether it enforces building or zoning rules there¹⁰.
3. Apply to Washington County Environmental Health for the well or septic approval needed for the site; a well 20 feet or deeper needs its permit before drilling^3,6.
4. Check the flood map before choosing a building pad; where more than 10 square miles of land drains to the site, an Iowa DNR Joint Application Form comes first²¹; submit the complete application to the Floodplain Administrator, who normally reviews a compliant application within one week, and pay the $50 fee to the Washington County Treasurer^6,21.
5. Obtain a driveway permit before creating or changing access to a county road, and give the County Engineer written notice at least 48 hours before construction starts⁷.
6. Contact the Iowa Department of Transportation instead when the entrance connects to a state highway²².
7. If dividing land, start with the Subdivision Coordinator; a pre-application conference is recommended and has no fee, while minor subdivision applications are due 30 days before the desired Board meeting²³.
8. Arrange any state-regulated electrical work and inspections that apply even without a county building permit¹⁰.

Soils: Washington County has 0% of soils rated “not limited” for a conventional septic drain field; a site evaluation determines whether a standard or engineered system can work¹⁷. Terrain: 93.9% of county land has slopes of 15% or less, and 10.8% is wooded¹⁷. Flood risk: farmhouses, barns, bins and sheds in the floodplain need a Floodplain Development Permit, with no farmer exemption²¹. Access: a county-road driveway needs the County Engineer’s approval and final inspection, and the owner or tenant pays for construction and materials⁷. Subdividing: minor subdivisions generally have 2–5 lots fronting an existing street without major improvements; major subdivisions include 6 or more lots without improvements or 2 or more requiring major improvements, including streets¹². Agricultural-use survey divisions can skip the usual application, departmental review and fees, but the plat must meet specified requirements and state that the parcel is valid for agricultural use only¹². Taxes: the effective property tax rate is about 1.3%, with a median annual bill around $2,688¹⁷. Farmland value averages about $9,552 an acre¹⁷.