SPC Water Resource Center
Pennsylvania Stormwater Regulations

The federal Clean Water Act (CWA) prohibits the discharge of pollutants into waterways without the appropriate permits. Pennsylvania’s Stormwater Management Act (better known as Act 167), MS4 Program, Chapter 102 (Erosion and Sediment Control Requirements), and NPDES Permit Program for Stormwater Discharges Associated with Construction Activities are amongst the Commonwealth’s methods for meeting the runoff-related requirements of the Clean Water Act. ‚Äď taken from http://www.stormwaterpa.org/how-to-apply-best-practices.html.

Act 167 Stormwater Management Act

Pennsylvania enacted the Stormwater Management Act (Act 167) in 1978 in an effort to prevent and mitigate the effects of accelerated stormwater runoff.  Act 167 requires counties to create and implement watershed-based or county-based stormwater management plans.  Additionally, municipalities are required to adopt and enforce ordinances to regulate stormwater impacts of development and redevelopment in accordance with the county plans. 

Visit PA DEP's website here to learn more about Act 167.

Policy and Purpose

The policy and purpose of Act 167 is to:

  1. Encourage planning and management of storm water runoff in each watershed that is consistent with sound water and land use practices. 
  2. Authorize a comprehensive program of storm water management designated to preserve and restore the flood carrying capacity of Commonwealth streams; to preserve to the maximum extent practicable natural storm water runoff regimes and natural course, current and cross section of water of the Commonwealth; and to protect and conserve ground waters and groundwater recharge areas.  
  3. Encourage local administration and management of storm water consistent with the Commonwealth's duty as trustee of natural resources and the people's constitutional right to the preservation of natural, economic, scenic, aesthetic, recreational and historic values of the environment. 

- Policy & Purpose information taken from Westmoreland County’s Act 167 Phase 1 report.

For a detailed listing of what is required in an Act 167 plan, see the full Stormwater Management Act here.

To Download the 167 Plans

Roll over a county on the map to the right to view that county's approved 167 Plan!

All plans are in PDF. In order to view them, you must have Adobe Acrobat Reader installed. If you don’t have Acrobat Reader, it’s available as a free download from Adobe.

Get Acrobat Reader

 

Approved Act 167 Plans

Our 10 counties are in various stages of Act 167 planning. Hover over the desired county for more information, completed plans, and model ordinances.

Plans

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 Policy & Regulations

 

Who We Are

Staff
Erin Kepple Adams
Abby Stark

Pennsylvania Stormwater Regulations

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Bulter | Fayette | Greene | Indiana |
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Act 167 Watersheds

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Municipal Separate Stormwater System (MS4)

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SWPA's Homeowner's Guide To Stormwater

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Additional Water
Quality Information

NEW! Quick Resource Guide to the MS4 Program

NEW! Quick Resource Guide for Winter Maintenance BMPs

Allegheny County  

Allegheny County approved their Phase 1 Stormwater Management Plan.

Phase 1 | Draft Phase 2 | Draft Model Ordinance |.

Armstrong County  

Armstrong County, in partnership with the Water Resource Center, is in the process of completing Phase 1 of the Act 167 planning process.

Act 167 work was completed for Glade Run Watershed in 1991.  View the document here.

Beaver County  

Beaver County has completed Phase 1 of the Act 167 planning process.  View the document here.

Butler County  

Butler County has completed the entire Act 167 planning process.  View the finalized Phase 1 and Phase 2 documents as well as the model ordinance:

Phase 1 | Phase 2
Model Ordinance

Fayette County  

Fayette County has completed the entire Act 167 planning process. 

View the finalized Phase 2 document (model ordinance included in Appendix B) here.

Greene County  

The Act 167 Planning Process has not yet been completed in Greene County.

Indiana County  

Indiana County, in partnership with the Water Resource Center, is in the process of completing Phase 1 of the Act 167 planning process.

Lawrence County  

Lawrence County has completed the entire Act 167 planning process.  View the finalized Phase 1 and Phase 2 documents as well as the model ordinance:

Phase 1 | Phase 1 Maps | Phase 2
| Model Ordinance |

Allegheny County  

Washington County has completed the entire Act 167 planning process. View the finalized Phase 2 documents, maps, and model ordinance documents below: 

Phase 2

Plate 1: Base Map | Plate 2: Land Use
Plate 3: Future Growth | Plate 4: Soils
Plate 5: DEM | Plate 6: Geology
Plate 7: Problems | Plate 8: Flood Control
Plate 9: Floodplain | Plate 10: SWM Districts

 

Westmoreland County  

Westmoreland County has completed Phase 1 of the Act 167 planning process.  View the document here.

 

 

Lawrence Butler Armstrong Indiana Beaver Allegheny Westmoreland Washington Greene Fayette