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Phases of the NPDES Stormwater ProgramPhase I In response to the 1987 Amendments to the Clean Water Act (CWA), the U.S. Environmental Protection Agency (EPA) developed Phase I of the NPDES Stormwater Program in 1990. The Phase I program addressed sources of stormwater runoff that had the greatest potential to negatively impact water quality. Under Phase I, EPA required NPDES permit coverage for stormwater discharges from:
Operators of the systems, facilities, and construction sites regulated under the Phase I NPDES Stormwater Program must obtain permit coverage for the stormwater discharge leaving sites. A summary of the Phase I Program is available in the Overview of the NPDES Stormwater Program [PDF Format] Phase II The Phase II Final Rule, published in the Federal Register on December 8, 1999, requires NPDES permit coverage for stormwater discharges from:
In addition to expanding the NPDES Stormwater Program, the Phase II Final Rule revises the no exposure exclusion and the temporary exemption for certain industrial facilities under Phase I of the NPDES Stormwater Program and certain exemptions relating to ISTEA. The Phase II Rule also established two potential waivers for small construction activities.
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