SWPPP inspection requirements by state
Every state runs construction stormwater a little differently: different rain triggers, different inspection frequencies, different inspector requirements. This directory summarizes the construction general permit rules for all 50 states, DC, and the federal EPA permit — with links to the official sources. Always verify against the current permit text for your project.
Alabama
0.75″ rain trigger · ADEM
Alaska
0.5″ rain trigger · ADEC
Arizona
0.5″ rain trigger · ADEQ
Arkansas
0.5″ rain trigger · DEQ
California
0.25″ rain trigger · SWRCB
Colorado
0.25″ rain trigger · CDPHE
Connecticut
0.5″ rain trigger · DEEP
Delaware
0.5″ rain trigger · DNREC
District of Columbia
0.25″ rain trigger · EPA CGP
Florida
0.5″ rain trigger · FL DEP
Georgia
0.5″ rain trigger · GA EPD
Hawaii
0.5″ rain trigger · DOH
Idaho
0.25″ rain trigger · IDEQ
Illinois
0.5″ rain trigger · IEPA
Indiana
0.5″ rain trigger · IDEM
Iowa
0.5″ rain trigger · Iowa DNR
Kansas
0.5″ rain trigger · KDHE
Kentucky
0.5″ rain trigger · KY EEC
Louisiana
0.5″ rain trigger · LDEQ
Maine
0.5″ rain trigger · Maine DEP
Maryland
0.5″ rain trigger · MDE
Massachusetts
0.25″ rain trigger · EPA CGP
Michigan
0.5″ rain trigger · EGLE
Minnesota
0.5″ rain trigger · MPCA
Mississippi
0.5″ rain trigger · MDEQ
Missouri
0.25″ rain trigger · MoDNR
Montana
0.5″ rain trigger · MT DEQ
Nebraska
0.5″ rain trigger · NDEE
Nevada
0.5″ rain trigger · NDEP
New Hampshire
0.25″ rain trigger · EPA CGP
New Jersey
0.5″ rain trigger · NJDEP
New Mexico
0.25″ rain trigger · EPA CGP
New York
0.5″ rain trigger · NYSDEC
North Carolina
1″ rain trigger · NC DEQ
North Dakota
0.5″ rain trigger · NDDEQ
Ohio
0.5″ rain trigger · Ohio EPA
Oklahoma
0.5″ rain trigger · OK DEQ
Oregon
0.5″ rain trigger · OR DEQ
Pennsylvania
0.25″ rain trigger · PA DEP
Rhode Island
0.5″ rain trigger · RIDEM
South Carolina
0.5″ rain trigger · SCDES
South Dakota
0.5″ rain trigger · DANR
Tennessee
0.5″ rain trigger · TDEC
Texas
0.25″ rain trigger · TCEQ
Utah
0.5″ rain trigger · UDWQ
Vermont
0.5″ rain trigger · VT DEC
Virginia
0.25″ rain trigger · VA DEQ
Washington
0.5″ rain trigger · Ecology
West Virginia
0.5″ rain trigger · WVDEP
Wisconsin
0.5″ rain trigger · WDNR
Wyoming
0.5″ rain trigger · WY DEQ
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