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Industrial Storm Water Compliance Monitoring

CWA Topics

Storm water discharges are generated by runoff from land and impervious areas such as paved streets, parking lots and building rooftops during rainfall and snow events that often contain pollutants in quantities that could adversely affect water quality. Most storm water discharges are considered point sources and require coverage by a National Pollutant Discharge Elimination System (NPDES) permit.

EPA develops national priorities that focus on significant environmental risks and noncompliance patterns. For Fiscal Years 2005 to 2007, the storm water national priority strategy aims to reduce the environmental impact of storm water runoff by undertaking federal enforcement cases in areas likely to produce the greatest environmental and public health benefit.

The primary method to control storm water discharges is through the use of best management practices. In response to the 1987 Amendments to the Clean Water Act (CWA), EPA developed Phase I of the NPDES Storm Water program in 1990. The Phase I program addressed sources of storm water runoff that had the greatest potential to negatively impact water quality.

Under Phase I, EPA required NPDES permit coverage for storm water discharges from:

Operators of the systems, facilities, and construction sites regulated under the Phase I NPDES storm water program must obtain permit coverage for the storm water discharge leaving sites.

The Phase II Final Rule requires NPDES permit coverage for storm water discharges from:

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Compliance Monitoring

EPA conducts inspections of three types of facility operations subject to the storm water regulations:

These inspections involve:

For MS4 operations, EPA also conducts audits designed to provide a comprehensive review of all facets of the Control Authority's storm water program.

Details on storm water inspections can be found in Chapter 11 of the NPDES Compliance Inspection Manual.

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Compliance Assistance | Compliance Monitoring | Compliance Incentives


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