SWPPP Requirements by State

While the EPA sets the baseline through the Construction General Permit, most states administer their own NPDES programs with additional or stricter requirements. Select your state below for a detailed compliance guide.

Click any state to view its SWPPP requirements

AK AL AR AZ CA CO CT DC DE FL GA HI IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NE NH NJ NM NV NY OH OK OR PA RI SC SD TN TX UT VA VT WA WI WV WY

Why State Requirements Matter

Over 45 states have been authorized by the EPA to administer their own NPDES stormwater programs. Some states require SWPPPs for projects disturbing as little as 5,000 square feet, well below the federal one-acre threshold. Others mandate specific BMP types, require certified inspectors, or impose additional reporting obligations.

State-Administered Programs (45 states)

These states administer their own NPDES stormwater programs with state-specific permits, fees, and requirements.

EPA-Administered Programs (6 states/territories)

These states have not been delegated NPDES authority — the EPA directly issues and enforces stormwater permits.

District of ColumbiaEPA

Common State Variations from Federal Requirements

Lower acreage thresholds triggering SWPPP requirements
More frequent inspection schedules
Required certifications for SWPPP preparers or inspectors
Specific BMP requirements for your region's soil and climate
Additional reporting and record-keeping obligations
Higher penalties for non-compliance

State Compliance Comparison Matrix

Compare SWPPP requirements across all states. Choose which columns to show, expand each column for a short definition, and click headers to sort. Your column choices are saved in this browser.

51 states · 7 columns visible


New Mexico(NM)	EPA	EPA Region 6	1 acre	Every 7 calendar days, or every 14 days with an allowable rain event inspection schedule	No	$64,618
Arizona(AZ)	State	ADEQ	1 acre	Every 7 calendar days, or every 14 days with qualifying rain event inspections	No	$25,000
Texas(TX)	State	TCEQ	1 acre; operators disturbing 5+ acres who are also primary operators must file a NOI. Small Construc…	Every 7 calendar days AND within 24 hours of a rain event of 0.5 inches or more. May reduce to every…	Yes	$25,000 per day per violation
Florida(FL)	State	FDEP	1 acre of land disturbance; common plans of development ≥1 acre trigger permit coverage	Every 7 calendar days AND within 24 hours after a rain event of 0.5 inches or more in a 24-hour peri…	Yes	$10,000 per day per violation; up to $50,000 per day for serious violations
Colorado(CO)	State	CDPHE	1 acre	Every 7 calendar days, or every 14 days with qualifying rain/snow event inspections	No	$10,000
New York(NY)	State	NYSDEC	1 acre or more; less than 1 acre if part of a larger common plan of development	At least every 7 days and within 24 hours of a 0.5-inch or greater rain event	Yes	$37,500 per day per violation
Washington(WA)	State	WA Ecology	1 acre or more; less than 1 acre if part of a larger common plan of development	Every 7 days and within 24 hours of a 0.5-inch or greater storm event	Yes	$10,000 per day per violation
Georgia(GA)	State	GA EPD	1 acre; common plans of development ≥1 acre trigger coverage regardless of individual lot size	Every 7 calendar days AND within 24 hours of a rain event of 0.5 inches or more in 24 hours. Georgia…	Yes	$2,500 per day per violation for state EPD violations; up to $25,000 per day for egregious violation…
California(CA)	State	SWRCB	1 acre or more; less than 1 acre if part of a larger common plan of development	Risk Level 1: before/after rain events. Risk Level 2/3: before, during, and after rain events; quali…	Yes	$10,000 per day per violation; up to $25,000/day for serious violations
Alabama(AL)	State	ADEM	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours after any storm event producing 0.5 inch or …	No	$25,000 per day per violation
Alaska(AK)	EPA	EPA Region 10	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying rain or snowmelt event produ…	No	$25,000–$37,500 per day per violation (EPA federal enforcement scale)
Arkansas(AR)	State	ADEQ / ADEE	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or m…	No	$10,000 per day per violation (state); federal enforcement up to $25,000/day
Connecticut(CT)	State	CT DEEP	1 acre or more; less than 1 acre if part of a larger common plan of development	At least every 7 days and within 24 hours of a 0.5-inch or greater storm event	No	$25,000 per day per violation
Delaware(DE)	State	DNREC	5,000 square feet or more of land disturbance (lower than the federal 1-acre threshold)	At least once every 7 calendar days and within 24 hours of a qualifying storm event	Yes	$10,000 per day per violation
District of Columbia(DC)	EPA	EPA Region 3	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.25 inch or …	No	$25,000–$37,500 per day per violation (federal EPA enforcement)
Hawaii(HI)	State	Hawaii DOH CWB	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event	Yes	$25,000 per day per violation
Idaho(ID)	EPA	EPA Region 10	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development excee…	Per EPA CGP 2022: at least once every 7 days and within 24 hours of a 0.25-inch or more rain event. …	Yes	$37,500 per day per violation under current federal CWA penalty adjustments (EPA-enforced)
Illinois(IL)	State	IEPA	1 acre of land disturbance	At least once every 7 days and within 24 hours after a 0.5-inch or greater rain event	Yes	$50,000 per day per violation
Indiana(IN)	State	IDEM	1 acre of land disturbance	At least once every 7 days and within 24 hours after a rainfall event of 0.5 inches or more	Yes	$25,000 per day per violation
Iowa(IA)	State	Iowa DNR	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development excee…	At least every 7 calendar days AND within 24 hours of any storm event of 0.5 inch or more in a 24-ho…	Yes	$10,000 per day per violation under Iowa Code Chapter 455B
Kansas(KS)	State	KDHE	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development excee…	At least every 14 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or more …	Yes	$10,000 per day per violation under Kansas Water Pollution Control Act (KSA 65-165)
Kentucky(KY)	State	KY DOW	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or m…	No	$25,000 per day per violation
Louisiana(LA)	State	LDEQ	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or m…	No	$25,000 per day per violation
Maine(ME)	State	ME DEP	1 acre of land disturbance	At least once every 7 days and within 24 hours after a storm event exceeding 0.5 inches	Yes	$10,000 per day per violation
Maryland(MD)	State	MDE	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or m…	Yes	$10,000 per day per violation (state); up to $25,000/day federal enforcement
Massachusetts(MA)	EPA	EPA Region 1	1 acre or more; less than 1 acre if part of a larger common plan of development	At least every 7 days and within 24 hours of a 0.5-inch or greater storm event (per EPA CGP)	No	$25,000 per day per violation (federal CGP)
Michigan(MI)	State	EGLE	1 acre of land disturbance	At least once every 7 days and within 24 hours after a storm event producing 0.5 inches or more of r…	Yes	$25,000 per day per violation (Part 31 Water Resources Protection Act)
Minnesota(MN)	State	MPCA	1 acre of land disturbance	At least once every 7 days and within 24 hours after a rainfall event of 0.5 inches or more	Yes	$20,000 per day per violation
Mississippi(MS)	State	MDEQ	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or m…	No	$25,000 per day per violation
Missouri(MO)	State	MO DNR	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 14 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or …	No	$10,000 per day per violation (state); up to $25,000/day federal enforcement
Montana(MT)	State	MT DEQ	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development excee…	At least every 14 days and within 24 hours of a qualifying storm event (0.5 inch or more in 24 hours…	Yes	$25,000 per day per violation under MCA 75-5-611
Nebraska(NE)	State	NDEE	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.25 inch or …	No	$10,000 per day per violation (state); up to $25,000/day federal enforcement
Nevada(NV)	State	NDEP	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	Weekly inspections of all BMPs and discharge points. Within 24 hours of a qualifying storm event of …	Yes	$25,000 per day per violation under NRS 445A
New Hampshire(NH)	EPA	EPA Region 1	1 acre or more under EPA CGP; NH Alteration of Terrain (AoT) permit required for 100,000 sq ft (2.3 …	At least every 7 days and within 24 hours of a 0.5-inch or greater storm event (per EPA CGP)	No	$25,000 per day per violation (federal CGP); NH RSA 482-A penalties up to $10,000/day
New Jersey(NJ)	State	NJDEP	1 acre or more; Soil Conservation District SESC approval required for 5,000 sq ft or more	At least every 7 days and within 24 hours of a 0.5-inch or greater storm event	No	$10,000 per day per violation; up to $50,000/day for significant violations
North Carolina(NC)	State	NC DEQ / DEMLR	1 acre; larger common plans of development trigger permit coverage	At least once per 7 calendar days AND within 24 hours after each precipitation event of 0.5 inches o…	Yes	$25,000 per day per violation
North Dakota(ND)	State	ND DEQ	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or m…	No	$10,000 per day per violation (state); federal enforcement up to $25,000/day
Ohio(OH)	State	Ohio EPA	1 acre of land disturbance	At least once every 7 days and within 24 hours of a 0.5-inch or greater storm event	Yes	$10,000 per day per violation (up to $25,000/day for serious violations)
Oklahoma(OK)	State	ODEQ	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or m…	No	$10,000 per day per violation (state); federal enforcement up to $25,000/day
Oregon(OR)	State	OR DEQ	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	Level 1: weekly and within 24 hours of a qualifying rain event (0.5 inch or more in 24 hours). Level…	Yes	$25,000 per day per violation
Pennsylvania(PA)	State	PA DEP	1 acre or more; less than 1 acre if part of a larger common plan of development	At least every 7 days and within 24 hours of a 0.5-inch or greater storm event	No	$10,000 per day per violation; up to $25,000/day for willful violations
Rhode Island(RI)	State	RI DEM	1 acre or more; less than 1 acre if part of a larger common plan of development	At least every 7 days and within 24 hours of a 0.5-inch or greater storm event	No	$10,000 per day per violation; up to $25,000/day for significant violations
South Carolina(SC)	State	SCDES	1 acre; common plans of development ≥1 acre trigger coverage	At least every 7 calendar days AND within 24 hours after each rain event of 0.5 inches or greater in…	Yes	$10,000 per day per violation
South Dakota(SD)	State	SD DANR	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or m…	No	$10,000 per day per violation (state); federal enforcement up to $25,000/day
Tennessee(TN)	State	TDEC	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or m…	No	$10,000 per day per violation (state); federal enforcement up to $25,000/day
Utah(UT)	State	Utah DEQ / DWQ	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development excee…	Every 14 days and within 24 hours after any qualifying storm event of 0.5 inch or more within a 24-h…	Yes	$10,000 per day per violation; up to $25,000 per day for serious violations under UCA 19-5-115
Vermont(VT)	State	VT DEC	1 acre of land disturbance	At least once every 7 calendar days and within 24 hours after a 0.5-inch or greater rain event	Yes	$42,500 per day per violation
Virginia(VA)	State	VA DEQ	1 acre; common plans of development ≥1 acre trigger coverage	At least every 14 calendar days (standard); every 7 calendar days for sites in active grading phases…	Yes	$32,500 per day per violation
West Virginia(WV)	State	WV DEP	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development	At least once every 7 calendar days and within 24 hours of a qualifying storm event of 0.5 inch or m…	No	$25,000 per day per violation
Wisconsin(WI)	State	WI DNR	1 acre of land disturbance	At least once every 7 days and within 24 hours after a rainfall event of 0.5 inches or more	Yes	$10,000 per day per violation
Wyoming(WY)	State	WY DEQ	1 acre of land disturbance, or less than 1 acre if part of a larger common plan of development excee…	At least every 14 days and within 24 hours of a qualifying storm event of 0.5 inch or more in a 24-h…	Yes	$25,000 per day per violation under Wyoming Environmental Quality Act

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