Alabama Stormwater Management Law: Statewide Environmental Rules Rules (2026)

Key Facts

Regulator: ADEM
Permit: ALR100000
Trigger: 1+ acres disturbed
Inspection frequency: Weekly plus rain events
Maximum penalty: $25,000 per day

Full Breakdown

Under the federal Clean Water Act and Alabama Code §22-22A, the Alabama Department of Environmental Management (ADEM) administers National Pollutant Discharge Elimination System (NPDES) stormwater permits. Construction operators disturbing one or more acres must obtain ADEM's General Permit ALR100000, prepare a Construction Best Management Practices Plan (CBMPP), and inspect controls weekly and after significant rain events. Municipal Separate Storm Sewer System (MS4) operators in urbanized areas hold their own ADEM permits requiring six minimum control measures. Cities may impose stricter local rules but cannot waive the statewide ADEM permit requirements.

Violations & Penalties

ADEM may issue civil penalties up to $25,000 per day per violation and stop-work orders for unpermitted discharges.

Frequently Asked Questions

Does my small home addition need an ADEM stormwater permit?

Only sites disturbing one or more acres (or part of a larger common plan) need ADEM's NPDES permit. Smaller projects still must follow local erosion ordinances.

What is an MS4 permit?

Alabama cities in urbanized areas hold ADEM Phase II MS4 permits requiring public education, illicit-discharge detection, construction oversight, post-construction controls, and pollution prevention programs.

Alabama ADEM Stormwater NPDES Permit Rules

Key Facts

Full Breakdown

Violations & Penalties

Frequently Asked Questions

Sources

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