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Municipal
Phase II MS4 Enrollment Strategy
Phase I (1990 - March 9, 2003)
For Region 3, Phase I includes only one individual permit. The City of Salinas holds the only individual municipal storm water permit ( Salinas Municipal Permit ) in the Central Coast Region.
Phase II (began March 10, 2003)
The Phase II Final Rule was published in the Federal Register on December 8, 1999. The SWRCB adopted general permits for Phase II Regulated Small MS4s in 2003. On March 10, 2003, operators of Phase II Regulated Small MS4s were required to obtain permit coverage.
Phase II Small MS4 General Permit
Phase II Regulations required automatically designated small MS4s to obtain coverage under a State Board issued general permit by March 10, 2003. An automatically designated small MS4 is any unpermitted Municipal Separate Storm Sewer System (MS4) located in an Urbanized Area (UA), as defined by the Bureau of the Census (an area of population of 50,000 and a population density of 1,000/square mile). These are listed in Attachment 1 of the permit that can be found on the Phase II Small MS4 General Permit link listed below.
A small MS4 could be designated to be covered by the Phase II permit if it is located in an Urban Cluster (UC), as defined by the Bureau of the Census, or meets one or more of the designation criteria listed in the permit itself. These are listed in Attachment 2 of the permit that can be found on the Phase II Small MS4 General Permit link listed below. California urbanized area maps.
Federal
and State facilities such as universities, military bases, hospitals, and school districts (also known as non-traditional MS4s) located within a designated
MS4, or within a UA or a UC are also required to
obtain permit coverage, either individually, or as
a co-permittee with a/the contiguous municipality(s).
These are listed in Attachment 3 of the permit that
can be found on the Phase II Small MS4 General
Permitlink listed
below.
Phase II Small MS4 General Permit
Region 3 Phase II MS4 Designees
Link to SWRCB Municipal Program web page
Model
Urban Runoff Program Document
