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.
Stormwater in Tigard is regulated jointly by the city and Clean Water Services, the regional district for urban Washington County. TMC Chapter 12.02 adopts by reference the CWS Resolution and Order construction standards and operational rules, making CWS Design and Construction Standards the governing technical document. Every proposed development must obtain a CWS stormwater connection permit demonstrating compliance with that manual, which covers water-quality treatment, flow control and detention, erosion and sediment control, and vegetated corridors along streams and wetlands. Disturbed pervious areas must be replanted to prevent erosion. Stormwater easements are required where a watercourse traverses a site. Related land-use chapters include TMC 18.510, 18.420, and 18.910.
Construction without a CWS stormwater connection permit, missing erosion control, untreated discharges to the storm system, or illicit non-stormwater discharges are enforced by Tigard Public Works and CWS. Remedies include stop-work orders, permit suspension, mandatory water-quality measures, and cleanup-cost recovery.
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