Gresham, OR Environmental Rules: Erosion Control (2026)
Key Facts
- Impervious trigger
- 1,000+ sq ft impervious surface
- Grading standard
- Building Code Appendix J applies
- Large sites
- 1200-C DEQ permit over 1 acre
- Fallback option
- In-lieu fees fund city retrofits
- Approval required
- Stormwater report approved before construction
Summary
Gresham requires approved grading and drainage plans, Building Code Appendix J compliance, and a stormwater report before construction on any development adding 1,000 square feet or more of impervious surface.
Unless otherwise specified in this document, Appendix J of the current edition of the Building Code shall apply to all grading and drainage construction on private property. For any proposed development that will include public facilities, a site plan showing grading, drainage, erosion control, and the other information detailed in the Stormwater Management Manual shall be approved prior to start of construction.
Full Breakdown
Under the Community Development Code, grading and drainage construction on private property must follow Appendix J of the Building Code, and any project adding public facilities needs an approved grading, drainage, and erosion-control site plan before construction starts. Development that adds or replaces 1,000 square feet or more of impervious surface must submit a stormwater report and provide on-site stormwater management facilities, following Green Development Practices such as infiltration. Sites over 1 acre must show a DEQ-approved 1200-C erosion and sediment control permit. If on-site stormwater control is infeasible, the Manager can approve an off-site facility or, as a last resort, impose in-lieu-of fees funding city stormwater retrofit projects.
Violations & Fines
Grading and drainage work that skips required plan approval or erosion controls can be halted mid-construction; the City may order additional erosion and sediment measures until the site is stabilized, with code enforcement following for uncorrected violations.
Frequently Asked Questions
Does Gresham require a stormwater permit for home additions?
What if my lot can't fit an on-site stormwater facility?
Sources & Official References
Other rules in Gresham
Compare Gresham to another location·View the Oregon environmental rules overview
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Erosion Control in Nearby Cities
How other cities in Multnomah County handle erosion control.