Storm Water Phase I
In 1987, Congress amended the Clean Water Act (CWA) to require implementation, in two
phases, of a comprehensive national program for addressing storm water discharges. The
first phase of the program, commonly referred to as "Phase I" was promulgated on November
16, 1990, (55 FR 47990). Phase I in 40 CFR Parts 9, 122, 123, and 124 requires National
Pollutant Discharge Elimination System (NPDES) permits for storm water discharge from a
large number of priority sources. These sources include municipal separate storm sewer
systems (MS4s) generally serving populations of 100,000 or more and several categories
of industrial activity, including construction sites that disturb five or more acres of
land. The SDDOT was issued a joint Phase I permit with the City of Sioux Falls effective
November 1, 1999. The permit expiration is September 30, 2004.
Storm Water Phase I MS4s
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