RANKING · 2025 ACS 1-YEAR · 51 SHOWN OF 51

Highest share of homes on septic, US states

US states ranked by the share of occupied homes that drain to a septic tank instead of a public sewer in 2025. The American Community Survey asked this for the first time in 2025, and its 1-year estimates cover only places with 65,000 or more residents. Vermont leads at 54.1%. 51 states qualify in total. The top 25 average 31.3%, against an all-states median of 21.7%.

All statesAll rankings

SAME RANKING BYCities Counties Metros

RANKPLACESTATEPOPHOMES ON SEPTICVS –

USUnited States–18.7%–

01Vermont, VTVT647,10654.1%–

02Maine, MEME1,387,81753.9%–

03New Hampshire, NHNH1,394,86849.1%–

04Alabama, ALAL5,086,76838.8%–

05Mississippi, MSMS2,946,77935.7%–

06West Virginia, WVWV1,778,37335.0%–

07North Carolina, NCNC10,730,40434.4%–

08Montana, MTMT1,116,87534.1%–

09Kentucky, KYKY4,534,82433.0%–

10Alaska, AKAK735,70632.4%–

11Tennessee, TNTN7,066,38332.4%–

12Arkansas, ARAR3,049,39131.9%–

13Georgia, GAGA10,940,40730.3%–

14South Carolina, SCSC5,296,22529.7%–

15Michigan, MIMI10,077,76125.8%–

16Connecticut, CTCT3,624,50825.6%–

17Oklahoma, OKOK4,028,63424.6%–

18Wyoming, WYWY582,39723.7%–

19Wisconsin, WIWI5,914,87223.7%–

20Idaho, IDID1,934,26223.2%–

21Indiana, ININ6,851,07323.2%–

22Washington, WAWA7,816,11622.9%–

23Virginia, VAVA8,705,17022.6%–

24Louisiana, LALA4,611,96121.8%–

25Rhode Island, RIRI1,101,80121.7%–

26New Mexico, NMNM2,120,24621.7%–

27Massachusetts, MAMA7,044,05621.0%–

28South Dakota, SDSD907,42820.8%–

29Minnesota, MNMN5,739,44519.2%–

30Missouri, MOMO6,191,81418.5%–

31North Dakota, NDND784,84118.3%–

32Delaware, DEDE1,021,19118.1%–

33Ohio, OHOH11,810,29318.0%–

34Iowa, IAIA3,210,50718.0%–

35Pennsylvania, PAPA13,018,63917.6%–

36Oregon, OROR4,254,29317.2%–

37Florida, FLFL22,416,07717.2%–

38New York, NYNY19,852,36616.6%–

39Maryland, MDMD6,206,01115.5%–

40Texas, TXTX30,188,42413.0%–

41Kansas, KSKS2,947,19713.0%–

42Nebraska, NENE1,978,70712.0%–

43Hawaii, HIHI1,445,23511.2%–

44Illinois, ILIL12,694,79811.1%–

45Arizona, AZAZ7,378,83810.9%–

46Colorado, COCO5,862,18910.1%–

47New Jersey, NJNJ9,343,8099.1%–

48Nevada, NVNV3,184,6126.9%–

49California, CACA39,287,3776.9%–

50Utah, UTUT3,392,3315.5%–

51District of Columbia, DCDC681,2940.5%–

SHOWING 1–51 OF 51

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UPDATED 2026-10-29 · DATA: US CENSUS BUREAU ACS 1-YEAR ESTIMATES

Frequently asked

Which state has the highest homes on septic?

Vermont ranks #1 with 54.1% (2025 American Community Survey 1-year estimates).

What are the top 5 states by homes on septic?

Vermont, Maine, New Hampshire, Alabama, Mississippi.

How many states are in this ranking?

51 states qualify after filtering for population minimums and data availability. The ranking covers 2025 ACS 1-year data, which the Census Bureau publishes only for places with 65,000 or more residents.

How is homes on septic measured?

Share of occupied homes whose sewage goes to a septic tank or septic system rather than a public sewer (ACS 1-year B25149). Source: US Census Bureau, American Community Survey 1-year estimates (2025).