A Phase II MS4 is any MS4 not already covered by the Phase I Program as a medium or large MS4. Phase II MS4s are automatically designated if any parts or the entire MS4 is located in an urbanized area as defined by the U.S. Bureau of the Census (based on the latest decennial census). An urbanized area (UA) is a central place (or places) and the adjacent densely surrounding territory that together has a minimum residential population of 50,000 and a minimum average density of 1,000 people/square mile.
MS4s that are located outside of the UA may also have potential for being designated by the NPDES Permitting Authority (DEP). For more information on Phase II MS4 designation, see Rule 62-624.800, F.A.C.
Operators of a regulated MS4 are required to:
Reduce the discharge of pollutants to the "maximum extent practicable" (MEP)
Protect water quality
Satisfy the water quality requirement of the Clean Water Act
The Phase II MS4 GP requires regulated MS4 operators to develop, implement and enforce a Stormwater Management Program (SWMP) that includes the six minimum control measures:
Public Education and Outreach
Illicit Discharge Detection and Elimination
Construction Site Stormwater Runoff Control
Post-Construction Stormwater Management in New Development and Redevelopment
Pollution Prevention/Good Housekeeping for Municipal Operations
The GP also requires activities to address impaired water bodies with Total Maximum Daily Loads (TMDLs) for regulated MS4s that discharge into TMDL water bodies.
Annual reports are required using the measurable goals for each minimum control measure for evaluating program effectiveness. During the first term of coverage, regulated Phase II MS4s must submit reports annually as specified in the GP. Reports are due within six months of the anniversary of the date of permit coverage. In subsequent terms, the permittee must submit reports in years two and four, unless otherwise requested by DEP. Reports are required to be submitted using DEP Form 62-621.300(7)(d).
Obtaining Permit Coverage Under the Generic Permit
NPDES Stormwater Program Florida Department of Environmental Protection 2600 Blair Stone Road, MS 3585 Tallahassee, FL 32399-2400 Phone: 866-336-6312 (toll-free) Email: NPDESemail@example.com
January 19, 2023 - 1:27pm
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The Florida Department of Environmental Protection is the state’s lead agency for environmental management and stewardship – protecting our air, water and land. The vision of the Florida Department of Environmental Protection is to create strong community partnerships, safeguard Florida’s natural resources and enhance its ecosystems.