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.
Federal EPA Construction General Permit
0.25″ rain trigger · U.S. EPA — applies in NH, MA, NM, DC, most territories, and tribal lands, and is the template most state permits follow
Alabama
0.75″ rain trigger · ADEM
Alaska
0.5″ rain trigger · ADEC
Arizona
0.25″ rain trigger · ADEQ
Arkansas
0.25″ rain trigger · DEQ
California
forecast-based inspection trigger · SWRCB
Colorado
discharge-based inspection trigger · CDPHE
Connecticut
discharge-based inspection trigger · DEEP
Delaware
no rain trigger (schedule-based inspections) · 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
0.25″ rain trigger · DOH
Idaho
0.25″ rain trigger · IDEQ
Illinois
0.5″ rain trigger · IEPA
Indiana
0.5″ rain trigger · IDEM
Iowa
no rain trigger (schedule-based inspections) · 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
0.25″ rain trigger · MDE
Massachusetts
0.25″ rain trigger · EPA CGP
Michigan
discharge-based inspection trigger · EGLE
Minnesota
0.5″ rain trigger · MPCA
Mississippi
discharge-based inspection trigger · MDEQ
Missouri
0.25″ rain trigger · MoDNR
Montana
0.25″ rain trigger · MT DEQ
Nebraska
0.25″ rain trigger · NDWEE
Nevada
0.5″ rain trigger · NDEP
New Hampshire
0.25″ rain trigger · EPA CGP
New Jersey
no rain trigger (schedule-based inspections) · NJDEP
New Mexico
0.25″ rain trigger · EPA CGP
New York
no rain trigger (schedule-based inspections) · NYSDEC
North Carolina
1″ rain trigger · NC DEQ
North Dakota
0.25″ rain trigger · NDDEQ
Ohio
0.5″ rain trigger · Ohio EPA
Oklahoma
0.5″ rain trigger · OK DEQ
Oregon
0.25″ rain trigger · OR DEQ
Pennsylvania
0.25″ rain trigger · PA DEP
Rhode Island
0.25″ rain trigger · RIDEM
South Carolina
no rain trigger (schedule-based inspections) · SCDES
South Dakota
0.25″ rain trigger · DANR
Tennessee
0.5″ rain trigger · TDEC
Texas
0.5″ rain trigger · TCEQ
Utah
0.5″ rain trigger · UDWQ
Vermont
discharge-based inspection trigger · VT DEC
Virginia
0.25″ rain trigger · VA DEQ
Washington
discharge-based inspection 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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