Auburn's Environmental Rules: The Rules That Matter
Every city handles environmental rules a little differently. In Auburn, Washington, there are 4 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.
Stormwater Management
Auburn follows the Department of Ecology Western Washington Stormwater Manual through ACC Title 13 surface water code, requiring runoff control for new and redeveloped sites in the Green River watershed.
Key details: Code: ACC 13 + Title 17. Manual: Ecology Western WA Stormwater. Trigger: 2,000 sq ft impervious. LID Required: Where feasible. Hotline: (253) 931-3048.
Contact your local code enforcement office for specific penalty information.
This is one of the stricter rules in Auburn's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.
Erosion Control
Auburn requires temporary erosion and sediment control (TESC) plans for clearing and grading per ACC Title 15 and the Ecology stormwater manual, with wet-season rules limiting soil disturbance from October to April.
Key details: Code: ACC 15 + Ecology Manual. TESC Threshold: 7,000 sq ft typical. Wet Season: Oct 1 to Apr 30. Stabilization: Required after grading pause. Discharge: Muddy water prohibited.
Contact your local code enforcement office for specific penalty information.
Compared to other cities, Auburn takes a harder line on erosion control. The enforcement and penalty structure reflects that.
Grading & Drainage
Grading permits are required in Auburn for fills, cuts, and landscape regrades beyond thresholds in ACC Title 15, with drainage plans reviewed by Public Works under the Ecology Stormwater Manual.
Key details: Permit Trigger: 50 cubic yards or 7,000 sq ft. Retaining Wall: Over 4 feet needs permit. Roof Drains: Must be tightlined. Flow Control: Match pre-development. Code: ACC Title 15 + Ecology.
Contact your local code enforcement office for specific penalty information.
This is not one of those rules that cities tend to ignore. Auburn actively enforces its grading & drainage requirements.
Flood Zones
Auburn regulates construction in FEMA-mapped Zone AE floodplains along the Green River and White River under ACC Title 15.68 and the Critical Areas Ordinance, requiring elevation and flood vents.
Key details: Code: ACC 15.68 + ACC 16. Elevation: 1 foot above BFE. Main Flood Zone: Green River Zone AE. Vents: Required below BFE. Program: FEMA NFIP.
Contact your local code enforcement office for specific penalty information.
This is not one of those rules that cities tend to ignore. Auburn actively enforces its flood zones requirements.
The Bottom Line
Auburn is tougher than many cities when it comes to environmental rules. Out of the 4 rules covered here, 4 are rated strict. If you are a homeowner, renter, or business owner in Auburn, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.
Keep in mind that Auburn can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.