The California Water Boards' Annual Performance Report - Fiscal Year 2014-15
REGULATE: NPDES STORMWATER |
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GROUP: |
MUNICIPAL STORMWATER PHASE I & II |
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MEASURE: |
MUNICIPAL SEPARATE STORM SEWER SYSTEMS REGULATED |
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MEASUREMENTS
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WHAT THE MEASURE IS SHOWING
WHY THIS MEASURE IS IMPORTANT
TECHNICAL CONSIDERATIONS
GLOSSARY
- Municipal Stormwater Phase I Facilities
- The Municipal Storm Water Permits regulate storm water discharges from municipal separate storm sewer systems (MS4s). Under Phase I, which began
in 1990, the Regional Water Boards have issued NPDES MS4 permits to permittees serving populations greater than 100,000 people. Many of these permits
are issued to a group of co-permittees encompassing an entire metropolitan area. These permits are reissued as the permits expire.
- Municipal Stormwater Phase II Facilities
- Under Phase II, the State Water Board adopted a General Permit for the Discharge of Storm Water from Small MS4s (WQ Order No. 2003-0005-DWQ) to provide
permit coverage for smaller municipalities (10,000 to 100,000 people), including non-traditional small MS4s which are governmental facilities such
as military bases, public campuses, prisons and hospital complexes.
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