Allegheny County stormwater management is governed by PA Act 167 watershed plans administered by ACHD and municipalities. Pittsburgh PWSA enforces green infrastructure under EPA consent decree. Projects over 1 acre require NPDES permits.
Allegheny County has adopted Act 167 Stormwater Management Plans for Chartiers Creek, Turtle Creek, Pine Creek, Deer Creek, Lower Allegheny, and Monongahela watersheds. Developments disturbing 1 or more acres need PA DEP NPDES Construction Permit plus ACHD and municipal approvals. Pittsburgh Water and Sewer Authority (PWSA) operates under a federal EPA consent decree requiring Green First Plan investments in bioswales, rain gardens, and combined sewer overflow (CSO) reduction. Downtown and older neighborhoods have combined sewers subject to CSO regulation under ALCOSAN Clean Water Plan.
NPDES violations: up to 25,000 dollars per day per PA Clean Streams Law. Local stormwater violations: 500 to 10,000 dollars. EPA federal penalties can exceed 50,000 dollars per day.
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See how Allegheny County's stormwater management rules stack up against other locations.
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