Washington County, AR Environmental Rules: Stormwater Management (2026)
Key Facts
- Permit Trigger
- 1 acre disturbed
- State Permit
- DEQ ARR150000
- Plan
- SWPPP kept on site
- Watersheds
- Illinois River, Beaver Lake
- Local MS4
- Fayetteville, Springdale
Summary
Any construction disturbing one acre or more in Washington County needs coverage under Arkansas DEQ's construction general permit (ARR150000) plus a SWPPP. Fayetteville and Springdale add local MS4 drainage review.
Small Site (AUTOMATIC COVERAGE for 1 Acre or More but Less than 5 Acres)
Full Breakdown
Construction disturbing one acre or more anywhere in Washington County must obtain coverage under Arkansas DEQ's statewide construction general permit ARR150000 and keep a Stormwater Pollution Prevention Plan (SWPPP) on site. Fayetteville and Springdale run MS4 permits and review post-construction detention, water-quality volume, and low-impact design for new development. Because much of the county sits on karst and drains to the Illinois River and Beaver Lake watersheds, sediment and nutrient runoff controls carry real weight. Any stormwater facility you build is maintained at the property owner's expense.
Violations & Fines
Building without ARR150000 coverage or a SWPPP triggers a stop-work order and DEQ penalties. Illicit discharges to storm drains draw fines that climb with the volume and duration involved.
Frequently Asked Questions
Do I need a stormwater permit in Washington County?
Why is runoff such a big deal here?
Sources & Official References
Other rules in Washington County
Compare Washington County to another location·View the Arkansas environmental rules overview
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