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Septic requirements by state

Minimum tank size, design flow, and the governing regulation for all 50 states. Each page also covers local geology, which system types actually get built there, and the counties where the rules bite hardest.

AlabamaALAlaskaAKArizonaAZArkansasARCaliforniaCAColoradoCOConnecticutCTDelawareDEFloridaFLGeorgiaGAHawaiiHIIdahoIDIllinoisILIndianaINIowaIAKansasKSKentuckyKYLouisianaLAMaineMEMarylandMDMassachusettsMAMichiganMIMinnesotaMNMississippiMSMissouriMOMontanaMTNebraskaNENevadaNVNew HampshireNHNew JerseyNJNew MexicoNMNew YorkNYNorth CarolinaNCNorth DakotaNDOhioOHOklahomaOKOregonORPennsylvaniaPARhode IslandRISouth CarolinaSCSouth DakotaSDTennesseeTNTexasTXUtahUTVermontVTVirginiaVAWashingtonWAWest VirginiaWVWisconsinWIWyomingWY
StateMin tank (1–3 BR)Design flow / bedroomGoverning regulation
Alabama1,000 gal150 gpdAlabama Administrative Code Chapter 420-3-1
Alaska1,000 gal150 gpdAlaska Administrative Code Title 18
Arizona1,000 gal150 gpdArizona Administrative Code Title 18
Arkansas1,000 gal150 gpdArkansas Department of Health Rules and Regulations Pertaining to Onsite Wastewater Systems
California1,200 gal150 gpdState Water Board OWTS Policy (Water Quality Control Policy for Siting
Colorado1,000 gal150 gpdColorado Regulation 43
Connecticut1,000 gal150 gpdConnecticut Public Health Code Section 19-13-B103
Delaware1,000 gal150 gpdDelaware Regulations Governing the Design
Florida900 gal150 gpdFlorida Administrative Code Chapter 64E-6
Georgia1,000 gal150 gpdGeorgia Rules and Regulations Chapter 511-3-1
Hawaii1,000 gal150 gpdHawaii Administrative Rules Chapter 11-62
Idaho1,000 gal150 gpdIDAPA 58.01.03
Illinois1,000 gal150 gpdIllinois Private Sewage Disposal Licensing Act and Code
Indiana1,000 gal150 gpd410 IAC 6-8.3
Iowa1,000 gal150 gpdIowa Administrative Code 567 Chapter 69
Kansas1,000 gal150 gpdKansas Administrative Regulations Article 3
Kentucky1,000 gal150 gpd902 KAR 10:085
Louisiana1,000 gal150 gpdLouisiana Sanitary Code Title 51
Maine1,000 gal150 gpdMaine Subsurface Wastewater Disposal Rules
Maryland1,000 gal150 gpdCOMAR 26.04.02
Massachusetts1,500 gal110 gpd310 CMR 15.000
Michigan1,000 gal150 gpdMichigan has no statewide residential onsite sewage code; county and district health departments adopt local sanitary codes under authority of the Public Health Code
Minnesota1,000 gal150 gpdMinnesota Rules Chapters 7080 through 7083
Mississippi1,000 gal150 gpdMississippi State Department of Health Regulation Governing Individual On-Site Wastewater Disposal Systems
Missouri1,000 gal150 gpd19 CSR 20-3.060
Montana1,000 gal150 gpdAdministrative Rules of Montana Title 17
Nebraska1,000 gal150 gpdTitle 124
Nevada1,000 gal150 gpdNevada Administrative Code Chapter 444
New Hampshire1,000 gal150 gpdNew Hampshire Code of Administrative Rules Env-Wq 1000
New Jersey1,000 gal150 gpdNew Jersey Administrative Code 7:9A
New Mexico1,000 gal150 gpd20.7.3 NMAC
New York1,000 gal150 gpd10 NYCRR Appendix 75-A
North Carolina1,000 gal120 gpd15A NCAC 18E
North Dakota1,000 gal150 gpdNorth Dakota Administrative Code Article 33.1-03
Ohio1,000 gal150 gpdOhio Administrative Code Chapter 3701-29
Oklahoma1,000 gal150 gpdOklahoma Administrative Code Title 252
Oregon1,000 gal150 gpdOregon Administrative Rules Chapter 340
Pennsylvania1,000 gal150 gpdTitle 25 Pennsylvania Code Chapter 73
Rhode Island1,000 gal150 gpd250-RICR-150-10-6
South Carolina1,000 gal150 gpdSouth Carolina Regulation 61-56
South Dakota1,000 gal150 gpdAdministrative Rules of South Dakota Article 74:53
Tennessee1,000 gal150 gpdTennessee Rules Chapter 0400-48-01
Texas1,000 gal150 gpd30 Texas Administrative Code Chapter 285
Utah1,000 gal150 gpdUtah Administrative Code R317-4
Vermont1,000 gal140 gpdVermont Wastewater System and Potable Water Supply Rules
Virginia1,000 gal150 gpd12VAC5-610
Washington1,000 gal120 gpdWAC 246-272A
West Virginia1,000 gal150 gpdWest Virginia Legislative Rule 64CSR9
Wisconsin1,000 gal150 gpdWisconsin Administrative Code SPS 383
Wyoming1,000 gal150 gpdWyoming Water Quality Rules Chapter 25