5 county-level rules, plus city-specific rules for 3 cities in Allegheny County, Pennsylvania.
Verified from official government sources
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.
Erosion and sediment (E&S) control required for all earth disturbance in Allegheny County under 25 Pa. Code Ch. 102. ACHD and municipalities enforce with NPDES Construction Permits for disturbances of 1+ acre.
PA DEP Construction Stormwater - 25 Pa. Code Chapter 102 Program
DEP's Bureau of Clean Water administers the statewide Chapter 102 program for earth disturbance activities including erosion and sediment control (E&S) and post-construction stormwater management (PCSM). Chapter 102 requires a permit from DEP for the following activities: Construction activities with earth disturbances greater than or equal to one acre, not including agricultural plowing or til...
Allegheny County is inland and has no ocean coast — Pennsylvania's only coastal-zone counties under the federal Coastal Zone Management Act are Erie (Lake Erie) and the Delaware estuary counties. Allegheny's analogous regulatory regime is floodplain management for the Three Rivers (Allegheny, Monongahela, Ohio). Floodplain ordinances are administered by each of the 130 municipalities under PA Act 166 of 1978 (32 P.S. 679.101) and 12 Pa. Code Chapter 113, and reviewed against the FEMA County-Wide Flood Insurance Study revised September 26, 2014.
Allegheny County has extensive FEMA-mapped floodplains along the Allegheny, Monongahela, and Ohio Rivers plus dozens of tributary creeks. Downtown Pittsburgh Point area sits in 100-year floodplain. NFIP participation required countywide.
Grading and drainage in Allegheny County regulated under municipal codes, PA Chapter 102 E&S, and county stormwater ordinances. Steep slopes over 25% trigger enhanced review in many Pittsburgh hillside neighborhoods.
3 cities in Allegheny County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
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Allegheny County Ordinance Hub →