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Phase I MS4 Permits

The Phase I MS4 Permits issued throughout the State are presented below by Regional Water Board.

Regional Water Boards

Region 1

Region 2

Region 3

Region 4

Region 5

The below permits are older and once expired, enrollees will be required to enroll under the above Region-wide MS4 permit. The below permits are included for completeness until such time as they have expired.

Region 6

Region 7

Region 8

Region 9

(Updated 10/10/22)

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