Environmental Rules in Washington County, AR (2026)

3 county-level rules, plus city-specific rules for 1 city in Washington County, Arkansas.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Washington County. If you live within an incorporated city, that city's own rules apply: see the city list below.

Stormwater Management

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.

Washington County Stormwater Management Rules

Some Restrictions

Arkansas DEQ Construction Stormwater General Permit No. ARR150000

Small Site (AUTOMATIC COVERAGE for 1 Acre or More but Less than 5 Acres)

Full ordinance details →Official source ↗

Erosion Control

Construction sites in Washington County must control erosion and sediment under Arkansas DEQ permit ARR150000 once one acre is disturbed. Silt fence, wattles, and stabilized entrances are standard; cities inspect grading.

Washington County Erosion Control Requirements

Some Restrictions

Arkansas DEQ Construction Stormwater General Permit No. ARR150000

Small Site (AUTOMATIC COVERAGE for 1 Acre or More but Less than 5 Acres)

Full ordinance details →Official source ↗

Flood Zones

Washington County regulates development in Special Flood Hazard Areas under its Flood Damage Prevention Program. The ordinance restricts building, filling, grading, mining and other alterations in mapped flood zones and requires full compliance before any structure is built, moved or substantially changed.

Washington County Flood Damage Prevention

Some Restrictions

Washington County Code of Ordinances § 270.00

LANDS TO WHICH THIS ORDINANCE APPLIES. This ordinance shall apply to all Special Flood Hazard Areas within the jurisdiction of Washington County, Arkansas. ... This Ordinance controls floodplain development (structural development, placement of manufactured structures, clearing, grading, mining, drilling, dredging, placement of fill, excavating, watercourse alteration, drainage improvement, roa...

Full ordinance details →Official source ↗

Environmental Rules by City in Washington County

1 cities in Washington County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.

SpringdalePop. 84,161

3 verified rules • Erosion Control, Flood Zones

All Washington County ordinances

See every category we cover for Washington County: parking, noise, fences, fires, animals, pools, and more.

Washington County Ordinance Hub →