Tigard, OR Environmental Rules: Erosion Control (2026)

Two provisions of the Tigard Municipal Code carry erosion and sediment control in the City of Tigard, Washington County, Oregon. The first is § 10.32.205, titled Physical Erosion, in the traffic chapter of Title 10. It bars any person from dragging, dropping, tracking or otherwise placing or depositing, or permitting the deposit of, mud, dirt, rock or other debris upon a public street or into any part of the public storm and surface water system. The rule reaches deposits a person makes directly and deposits a person permits. Cleanup is the responsibility of the person who caused the deposit: the material must be removed immediately, using hand labor or mechanical means. Washing or flushing material into any part of the storm and surface water system is not a permitted cleanup, and the section says any such action is an additional violation on top of the original deposit.

The second provision is § 15.16.050.D.3 in the encroachment permit chapter. When material or equipment is staged in the public right-of-way, the city engineer can require approval of an erosion control and pollution prevention plan before the encroachment permit issues. Section 15.16.015 defines construction material as any privately owned dirt, rock, mulch, bark, landscaping and irrigation materials, rebar, lumber, siding, roofing, and other building materials. Those materials cannot be placed within the right-of-way or public area unless the required erosion control and pollution prevention best management practice measures are in place to protect the downgradient storm and surface water collection and conveyance system. Under § 15.16.050.D.1 the materials must also sit between six to 12 inches from the curb and stay out of any vehicle or bicycle travel lane.

The permit itself adds pressure to comply. Under § 15.16.070.B an encroachment permit is automatically revoked if the permittee fails to comply with its conditions or fails to begin installation within 60 days after issuance, unless an extension is requested before the 60 days end. An applicant or affected property owner can appeal the city engineer's decision to the city hearings officer, but the appeal must be filed within 15 days of the decision (§ 15.16.040).