Environmental Rules in Tigard, OR (2026)
2 verified environmental rules for Tigard, Oregon, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
TMC Chapter 12.02 (Sanitary Sewer and Surface Water Management) adopts the ordinances, rules, and Design and Construction Standards of Clean Water Services (CWS) as Tigard's stormwater code. All new development must obtain a CWS stormwater connection permit and meet CWS water-quality, detention, and erosion-control requirements.
Tigard Stormwater: TMC 12.02 Adopts Clean Water Services Standards
Some RestrictionsFlood Zones
TMC Title 9, Chapter 9.10 (Areas of Special Flood Hazard) implements Tigard's NFIP participation and applies to FEMA Zones A, AO, AH, A1-30, AE, A99, and AR. The chapter enforces a stricter-than-federal zero-foot rise floodway standard anchored to the October 19, 2018 effective FIRM. Floodway development requires engineer certification.
Tigard Flood Zones: TMC 9.10 Zero-Foot Rise Floodway
Heavy RestrictionsLooking for Washington County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Tigard city rules.
Environmental Rules in Washington County →