Environmental Rules in Hillsboro, OR (2026)

1 verified environmental rules for Hillsboro, Oregon, sourced directly from the municipal code and official government pages.

Verified from official government sources

Flood Zones

Hillsboro participates in the NFIP and regulates development in FEMA flood zones. Rock Creek and Dairy Creek are primary flood areas. Construction requires elevation above BFE.

Hillsboro Flood Zone Regulations

Heavy Restrictions

Full ordinance details →Official source ↗

Looking for Washington County county-wide rules?

County ordinances apply to unincorporated areas and may supplement Hillsboro city rules.

Environmental Rules in Washington County →