RANKING · 2025 ACS 1-YEAR · 500 SHOWN OF 847

Highest share of homes on septic, US counties

US counties 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. Columbia County, Florida leads at 82.1%. 847 counties qualify in total. North Carolina carries 4 of the top 25 entries. The median across all 847 is 22.8%.

All statesAll rankings

SAME RANKING BYCities States Metros

RANKPLACESTATEPOPHOMES ON SEPTICVS –

USUnited States–18.7%–

01Columbia County, FLFL74,09482.1%–

02Barnstable County, MAMA233,53980.4%–

03Matanuska-Susitna, AKAK118,66678.7%–

04Wilkes County, NCNC66,23377.3%–

05Mason County, WAWA71,16575.2%–

06Walker County, ALAL65,14074.9%–

07Lapeer County, MIMI89,51674.6%–

08Franklin County, NCNC82,03774.1%–

09Putnam County, NYNY99,02872.7%–

10DeKalb County, ALAL74,08572.6%–

11Bedford County, VAVA83,05972.4%–

12Calvert County, MDMD94,48470.6%–

13Island County, WAWA85,65769.8%–

14Pender County, NCNC72,11168.8%–

15Surry County, NCNC72,28768.6%–

16Greene County, TNTN73,83168.1%–

17Van Zandt County, TXTX66,13067.7%–

18St. Clair County, ALAL98,20667.3%–

19Geauga County, OHOH95,67667.1%–

20Sussex County, NJNJ148,06366.7%–

21Northeastern Connecticut Planning Region, CTCT98,09666.2%–

22Montcalm County, MIMI69,40665.9%–

23Walton County, GAGA112,69665.8%–

24Pulaski County, KYKY67,38465.7%–

25Van Buren County, MIMI76,07165.4%–

26Putnam County, FLFL77,73465.2%–

27Monroe County, PAPA167,17965.0%–

28Cullman County, ALAL94,00964.6%–

29Citrus County, FLFL171,66664.3%–

30Allegan County, MIMI123,18863.7%–

31Kershaw County, SCSC73,16663.1%–

32Carteret County, NCNC70,46963.1%–

33Sullivan County, NYNY80,58662.9%–

34Oconee County, SCSC83,77562.3%–

35Wise County, TXTX83,77862.0%–

36Cumberland County, TNTN66,30061.9%–

37Rutherford County, NCNC65,74561.7%–

38Laurens County, SCSC71,84861.6%–

39Henderson County, NCNC122,37561.3%–

40Hunterdon County, NJNJ131,78161.2%–

41Rockingham County, NHNH324,07761.1%–

42Lincoln County, NCNC98,65460.6%–

43Robeson County, NCNC119,94160.4%–

44Elmore County, ALAL91,57760.2%–

45Augusta County, VAVA78,94059.9%–

46Washington County, RIRI129,79559.7%–

47Ulster County, NYNY183,33059.5%–

48Carroll County, GAGA131,03658.9%–

49Marshall County, ALAL103,53758.4%–

50Fauquier County, VAVA76,50358.1%–

51Rowan County, NCNC155,09657.8%–

52Davidson County, NCNC180,18257.4%–

53Lewis County, WAWA88,06257.3%–

54Parker County, TXTX184,76756.8%–

55Livingston County, MIMI197,31556.8%–

56Crow Wing County, MNMN69,13256.6%–

57Randolph County, NCNC149,51656.1%–

58Chippewa County, WIWI67,61456.0%–

59Talladega County, ALAL81,60355.9%–

60Sevier County, TNTN101,34255.8%–

61Burke County, NCNC88,65555.7%–

62Paulding County, GAGA190,99655.4%–

63Bastrop County, TXTX118,90855.1%–

64Kennebec County, MEME129,06755.0%–

65Cleveland County, NCNC103,32554.7%–

66St. Lawrence County, NYNY105,48854.4%–

67Calhoun County, ALAL115,83454.3%–

68Clallam County, WAWA78,20254.3%–

69Oswego County, NYNY118,56954.2%–

70Barrow County, GAGA99,77354.2%–

71Stanly County, NCNC68,83054.1%–

72Coweta County, GAGA160,24053.8%–

73Rockingham County, NCNC94,19553.8%–

74Lower Connecticut River Valley Planning Region, CTCT177,31153.6%–

75Hernando County, FLFL221,70153.2%–

76Walker County, GAGA70,25053.2%–

77Hamblen County, TNTN68,84353.2%–

78Blount County, TNTN143,82053.1%–

79Nevada County, CACA101,91152.8%–

80Grand Traverse County, MIMI96,72952.7%–

81Cheshire County, NHNH78,26952.4%–

82Madison County, NYNY67,12052.3%–

83Wayne County, NYNY91,25052.2%–

84Grafton County, NHNH93,22552.1%–

85Harnett County, NCNC150,13752.1%–

86York County, MEME222,43452.0%–

87Aroostook County, MEME66,60951.9%–

88Merrimack County, NHNH158,07851.8%–

89Effingham County, GAGA74,39751.7%–

90Apache County, AZAZ64,44551.6%–

91Suffolk County, NYNY1,546,09051.6%–

92Rogers County, OKOK102,19751.3%–

93Josephine County, OROR87,86751.0%–

94Steuben County, NYNY91,85550.9%–

95St. Mary's County, MDMD116,69250.8%–

96Johnston County, NCNC256,44850.8%–

97Highlands County, FLFL111,12250.8%–

98Morgan County, ININ74,96750.7%–

99Catoosa County, GAGA69,62850.5%–

100Clinton County, NYNY78,13850.4%–

101Marion County, FLFL442,66050.4%–

102Caldwell County, NCNC81,10550.2%–

103Lauderdale County, ALAL97,13549.8%–

104Anderson County, SCSC219,93049.8%–

105Dutchess County, NYNY300,70849.6%–

106Wayne County, NCNC122,27849.6%–

107Kosciusko County, ININ80,89249.3%–

108Warren County, NYNY65,02049.3%–

109Hall County, GAGA226,56849.1%–

110Franklin County, MAMA70,69848.6%–

111Northwest Hills Planning Region, CTCT114,69048.5%–

112Tehama County, CACA64,66548.3%–

113Sherburne County, MNMN104,19447.7%–

114Etowah County, ALAL103,88647.7%–

115Limestone County, ALAL122,92847.6%–

116Kitsap County, WAWA283,37447.6%–

117Penobscot County, MEME157,96747.5%–

118Cattaraugus County, NYNY75,39047.4%–

119Rockingham County, VAVA89,31647.3%–

120White County, ARAR80,08547.2%–

121Hood County, TXTX70,50147.2%–

122Iredell County, NCNC211,79847.2%–

123Moore County, NCNC110,61947.1%–

124Jones County, MSMS66,49647.1%–

125Ionia County, MIMI66,55746.8%–

126Carroll County, MDMD176,67746.6%–

127Henderson County, TXTX88,59546.5%–

128Belknap County, NHNH65,14746.5%–

129Chatham County, NCNC85,11146.2%–

130Lee County, NCNC70,25846.1%–

131Shiawassee County, MIMI67,68146.1%–

132Lincoln County, MOMO66,67646.1%–

133Wicomico County, MDMD106,89946.0%–

134Aiken County, SCSC181,51545.9%–

135Crawford County, PAPA81,79245.9%–

136Strafford County, NHNH135,04345.8%–

137Orangeburg County, SCSC83,17745.8%–

138Fayette County, GAGA125,15645.7%–

139Columbiana County, OHOH99,37745.7%–

140Newton County, GAGA125,58345.6%–

141Bradley County, TNTN115,46545.6%–

142Whitfield County, GAGA106,21245.6%–

143Fairbanks North Star, AKAK93,97245.5%–

144Mendocino County, CACA88,12245.3%–

145Pottawatomie County, OKOK75,10245.3%–

146Bartow County, GAGA120,80045.2%–

147Putnam County, TNTN86,61245.2%–

148Cayuga County, NYNY74,36544.9%–

149Jackson County, GAGA99,26544.7%–

150Lamar County, MSMS67,40344.6%–

151Midland County, MIMI83,75444.4%–

152Armstrong County, PAPA63,69844.4%–

153Salem County, NJNJ66,28044.4%–

154Spartanburg County, SCSC380,85744.3%–

155Bulloch County, GAGA86,94944.1%–

156Plymouth County, MAMA546,82944.0%–

157Pickens County, SCSC139,19844.0%–

158Thurston County, WAWA304,26143.9%–

159Elkhart County, ININ208,77443.8%–

160Isabella County, MIMI64,69143.7%–

161Harrison County, TXTX71,95643.6%–

162Troup County, GAGA72,84443.5%–

163Sullivan County, TNTN163,75942.9%–

164Liberty County, TXTX121,36442.9%–

165Somerset County, PAPA72,00442.7%–

166Santa Rosa County, FLFL211,11542.6%–

167Muskingum County, OHOH87,01442.1%–

168Ashtabula County, OHOH96,71342.0%–

169Columbia County, PAPA66,19341.9%–

170Catawba County, NCNC170,17241.8%–

171St. Croix County, WIWI98,27641.6%–

172Cecil County, MDMD107,13141.6%–

173Wayne County, OHOH116,75841.2%–

174Androscoggin County, MEME116,48741.1%–

175Hanover County, VAVA116,42341.1%–

176Lonoke County, ARAR76,66441.1%–

177Rockdale County, GAGA98,41641.0%–

178Ross County, OHOH76,42941.0%–

179St. Landry Parish, LALA80,76540.8%–

180Flathead County, MTMT115,42940.2%–

181Carbon County, PAPA65,86840.1%–

182Oldham County, KYKY70,98639.8%–

183Nacogdoches County, TXTX66,03539.8%–

184Adams County, PAPA107,59439.5%–

185Clinton County, MIMI80,43239.5%–

186San Juan County, NMNM120,34039.4%–

187Cumberland County, MEME317,22239.4%–

188Nash County, NCNC99,36539.3%–

189Lenawee County, MIMI97,77939.2%–

190Navajo County, AZAZ109,94639.1%–

191Wagoner County, OKOK93,26338.9%–

192Onslow County, NCNC217,17538.6%–

193Douglas County, GAGA154,29338.4%–

194Indiana County, PAPA82,87838.3%–

195Robertson County, TNTN80,17538.0%–

196Scioto County, OHOH71,36537.8%–

197Waller County, TXTX69,85837.6%–

198Henry County, GAGA264,92237.6%–

199Lauderdale County, MSMS70,31737.4%–

200El Dorado County, CACA192,32337.3%–

201Eaton County, MIMI109,58137.3%–

202Bullitt County, KYKY86,45437.3%–

203Floyd County, GAGA101,37837.2%–

204Buncombe County, NCNC277,41737.0%–

205Hawaii County, HIHI210,04337.0%–

206Comal County, TXTX209,16636.8%–

207Southeastern Connecticut Planning Region, CTCT284,01536.8%–

208Lewis and Clark County, MTMT75,33136.7%–

209Belmont County, OHOH64,43436.6%–

210Tompkins County, NYNY104,04736.5%–

211Lafourche Parish, LALA95,50536.5%–

212Franklin County, MOMO108,09036.3%–

213Hunt County, TXTX123,33636.3%–

214Lexington County, SCSC317,58836.3%–

215Portage County, WIWI71,94336.1%–

216Grays Harbor County, WAWA78,14436.1%–

217Newport County, RIRI83,05136.0%–

218Jackson County, MIMI159,55235.5%–

219Forsyth County, GAGA282,80535.4%–

220Yavapai County, AZAZ252,55235.3%–

221Rensselaer County, NYNY160,51035.2%–

222Sumter County, SCSC105,06735.1%–

223Valencia County, NMNM82,01334.9%–

224Marquette County, MIMI68,06434.8%–

225Indian River County, FLFL172,79934.7%–

226Christian County, MOMO96,72534.7%–

227Lake County, CACA67,77234.6%–

228Chautauqua County, NYNY124,12634.5%–

229Sussex County, DEDE277,14034.5%–

230Anderson County, TNTN82,06634.4%–

231LaPorte County, ININ111,29434.4%–

232Nassau County, FLFL106,87934.3%–

233Wilson County, TNTN175,03334.3%–

234Frederick County, VAVA99,95534.2%–

235McKinley County, NMNM68,11934.1%–

236Albemarle County, VAVA118,35634.1%–

237Morgan County, ALAL126,48334.0%–

238Jefferson County, NYNY111,54033.9%–

239Florence County, SCSC138,50433.9%–

240Spalding County, GAGA70,77533.9%–

241Cochise County, AZAZ126,33233.7%–

242Hancock County, ININ90,96933.7%–

243Union County, OHOH73,44633.3%–

244Western Connecticut Planning Region, CTCT640,48233.3%–

245Madera County, CACA167,92733.3%–

246Tangipahoa Parish, LALA141,34633.2%–

247Saratoga County, NYNY241,34333.2%–

248St. Clair County, MIMI160,48633.2%–

249Warren County, NJNJ112,95333.1%–

250Livingston Parish, LALA155,03633.1%–

251Ontario County, NYNY113,13033.0%–

252Lee County, ALAL189,88133.0%–

253Orange County, NCNC152,49833.0%–

254Hillsborough County, NHNH433,41532.8%–

255Cowlitz County, WAWA114,88532.8%–

256Santa Fe County, NMNM156,90732.8%–

257Washington County, TNTN141,19932.7%–

258Wood County, WIWI74,06032.6%–

259Tuscarawas County, OHOH92,37332.6%–

260Angelina County, TXTX88,15432.5%–

261Shasta County, CACA181,64832.4%–

262Johnson County, TXTX218,04832.4%–

263Walton County, FLFL93,28832.3%–

264Madison County, KYKY101,69632.3%–

265Cumberland County, NJNJ157,14832.2%–

266Monroe County, MIMI156,00432.2%–

267Lowndes County, GAGA122,86732.1%–

268Chemung County, NYNY80,41532.1%–

269Portage County, OHOH163,40432.0%–

270Hardin County, KYKY113,48231.8%–

271Washington County, WIWI139,23831.8%–

272Ellis County, TXTX240,86731.8%–

273Calhoun County, MIMI133,40831.8%–

274Saline County, ARAR133,28831.7%–

275Shelby County, ALAL238,55231.7%–

276Fayette County, PAPA123,02131.7%–

277Dodge County, WIWI89,09731.6%–

278Klamath County, OROR70,27431.6%–

279Creek County, OKOK74,96731.6%–

280Lycoming County, PAPA112,58731.4%–

281Garland County, ARAR99,69531.4%–

282Sauk County, WIWI66,65231.4%–

283Muskegon County, MIMI177,90131.3%–

284Spotsylvania County, VAVA155,38831.3%–

285Marathon County, WIWI139,43231.2%–

286Chittenden County, VTVT169,11531.1%–

287Otero County, NMNM70,36831.1%–

288Chelan County, WAWA81,94131.1%–

289Jefferson County, MOMO233,13231.1%–

290Gaston County, NCNC246,55830.9%–

291Alamance County, NCNC186,17730.9%–

292Lee County, MSMS83,73130.9%–

293Vermilion County, ILIL71,25930.9%–

294Cherokee County, GAGA299,27330.8%–

295Richland County, OHOH124,89330.6%–

296Butte County, CACA209,21130.6%–

297Craven County, NCNC105,02530.5%–

298Douglas County, OROR111,95130.5%–

299Walworth County, WIWI106,12730.5%–

300Faulkner County, ARAR133,97930.5%–

301Clark County, OHOH135,34030.4%–

302Mercer County, PAPA107,86030.4%–

303Yakima County, WAWA259,18530.2%–

304Glynn County, GAGA87,59930.2%–

305Lyon County, NVNV65,08830.2%–

306Hampshire County, MAMA164,06530.1%–

307Skagit County, WAWA132,97530.1%–

308St. Joseph County, ININ272,86129.9%–

309Grant County, ININ66,52429.7%–

310Kent County, DEDE194,78629.5%–

311Starr County, TXTX66,31929.4%–

312Grant County, WAWA105,72729.4%–

313Washington County, MDMD157,73129.3%–

314St. Tammany Parish, LALA279,10829.3%–

315Charlotte County, FLFL217,21229.2%–

316Union County, NCNC267,67429.2%–

317Wilson County, NCNC81,15029.0%–

318Kauai County, HIHI73,40028.9%–

319Wright County, MNMN157,55928.8%–

320Orange County, NYNY417,66928.8%–

321Bowie County, TXTX92,69628.7%–

322Mohave County, AZAZ228,10228.7%–

323Lawrence County, PAPA83,91128.7%–

324Berkeley County, WVWV139,52228.6%–

325Bristol County, MAMA593,64028.5%–

326Butler County, PAPA200,16928.4%–

327Jefferson County, WIWI86,50528.3%–

328Leavenworth County, KSKS84,59028.3%–

329Smith County, TXTX252,54928.3%–

330Licking County, OHOH185,56428.2%–

331Lancaster County, SCSC114,29628.2%–

332Clearfield County, PAPA78,10028.1%–

333Muskogee County, OKOK66,70828.1%–

334Charles County, MDMD176,59328.1%–

335Saginaw County, MIMI187,68827.8%–

336Madison County, TNTN100,79027.8%–

337Cape May County, NJNJ93,39027.8%–

338Warren County, KYKY149,37527.8%–

339McHenry County, ILIL317,75127.6%–

340Linn County, OROR132,84327.6%–

341Kaufman County, TXTX209,23527.5%–

342St. Francois County, MOMO67,80927.4%–

343Fairfield County, OHOH169,75227.2%–

344Houston County, ALAL110,31827.2%–

345Schuylkill County, PAPA145,08527.2%–

346McCracken County, KYKY67,55327.1%–

347LaSalle County, ILIL107,77327.0%–

348Rapides Parish, LALA125,87727.0%–

349Tuscaloosa County, ALAL241,36827.0%–

350Missoula County, MTMT123,51327.0%–

351Chester County, PAPA557,11627.0%–

352Guadalupe County, TXTX201,11126.9%–

353Calcasieu Parish, LALA208,46626.8%–

354Rankin County, MSMS162,18126.8%–

355Berrien County, MIMI152,44426.6%–

356Deschutes County, OROR213,07226.6%–

357York County, SCSC306,88726.4%–

358Grayson County, TXTX153,61326.4%–

359Northumberland County, PAPA89,92026.4%–

360Warrick County, ININ66,80326.4%–

361Sandoval County, NMNM159,56526.4%–

362Pierce County, WAWA946,28826.4%–

363Orange County, TXTX86,26626.4%–

364Gallatin County, MTMT128,74026.2%–

365Ascension Parish, LALA135,10526.1%–

366Volusia County, FLFL606,57326.0%–

367Stafford County, VAVA170,80325.9%–

368Ottawa County, MIMI308,45925.9%–

369Terrebonne Parish, LALA104,16325.8%–

370Kent County, RIRI173,49525.6%–

371Forrest County, MSMS79,03425.6%–

372Liberty County, GAGA70,31325.5%–

373Benton County, ARAR332,55425.5%–

374Hamilton County, TNTN390,83325.5%–

375Mobile County, ALAL411,65825.5%–

376Baldwin County, ALAL267,76125.4%–

377Lake County, FLFL456,06825.4%–

378Santa Cruz County, CACA258,85225.3%–

379Worcester County, MAMA888,50225.3%–

380Sutter County, CACA98,78725.2%–

381Maury County, TNTN118,13125.2%–

382Jefferson County, ALAL665,74225.1%–

383Hays County, TXTX304,39025.0%–

384Manitowoc County, WIWI81,71025.0%–

385Ector County, TXTX173,80125.0%–

386York County, PAPA473,19725.0%–

387Oneida County, NYNY226,39224.9%–

388Williamson County, ILIL67,22524.9%–

389Clay County, FLFL239,59324.8%–

390Pitt County, NCNC182,93624.8%–

391Medina County, OHOH185,02524.7%–

392Iberia Parish, LALA66,84624.7%–

393St. Louis County, MNMN200,51824.7%–

394Madison County, ININ135,08824.6%–

395Frederick County, MDMD302,88324.5%–

396Brevard County, FLFL663,98224.5%–

397Franklin County, PAPA160,65224.5%–

398Raleigh County, WVWV71,77524.3%–

399Roanoke County, VAVA97,15024.2%–

400Stearns County, MNMN164,11024.2%–

401Fond du Lac County, WIWI104,66924.0%–

402Bartholomew County, ININ85,72924.0%–

403Berks County, PAPA440,07223.9%–

404Marion County, OHOH65,11523.8%–

405Trumbull County, OHOH198,97223.8%–

406Hendricks County, ININ193,51023.7%–

407Broome County, NYNY195,73623.7%–

408Berkshire County, MAMA128,22423.7%–

409Rutherford County, TNTN386,35223.7%–

410Kankakee County, ILIL105,52523.6%–

411Schenectady County, NYNY162,58123.6%–

412Twin Falls County, IDID97,53923.6%–

413Greenwood County, SCSC70,37923.6%–

414Yamhill County, OROR110,02423.4%–

415Box Elder County, UTUT65,32023.4%–

416Craighead County, ARAR116,95723.4%–

417Madison County, ALAL433,51623.4%–

418Umatilla County, OROR81,11923.2%–

419Harford County, MDMD266,44623.2%–

420Jackson County, MSMS147,66623.1%–

421Rice County, MNMN69,93923.1%–

422Lee County, FLFL875,60723.1%–

423Escambia County, FLFL333,83423.1%–

424Bay County, FLFL204,47922.8%–

425Montgomery County, VAVA98,43422.8%–

426Martin County, FLFL166,27222.6%–

427Kootenai County, IDID191,86422.6%–

428Canyon County, IDID275,12322.5%–

429Miami County, OHOH112,63422.5%–

430Allen County, OHOH100,88122.5%–

431Houston County, GAGA178,21422.4%–

432Wayne County, ININ66,16922.4%–

433Bay County, MIMI102,12322.3%–

434Sumner County, TNTN215,53822.3%–

435Daviess County, KYKY104,89822.3%–

436Clackamas County, OROR426,28022.1%–

437Jefferson County, ARAR62,98721.9%–

438Porter County, ININ176,04921.8%–

439Naugatuck Valley Planning Region, CTCT463,34921.8%–

440Brunswick County, NCNC174,70221.8%–

441Harrison County, WVWV64,22121.7%–

442Beaver County, PAPA166,03221.6%–

443Leon County, FLFL299,04821.6%–

444Montgomery County, TXTX781,19421.5%–

445Whatcom County, WAWA236,39221.5%–

446Buchanan County, MOMO83,54021.4%–

447Clermont County, OHOH216,97721.3%–

448Howard County, ININ83,90421.3%–

449Floyd County, ININ82,15321.2%–

450Humboldt County, CACA131,64721.2%–

451Boone County, ININ80,68921.2%–

452Cabell County, WVWV91,18321.1%–

453Payne County, OKOK83,88921.1%–

454Hancock County, OHOH75,03421.1%–

455Kalamazoo County, MIMI263,79520.9%–

456San Benito County, CACA70,08220.9%–

457Coconino County, AZAZ144,36820.8%–

458Yuma County, AZAZ224,44920.8%–

459Tom Green County, TXTX120,60220.6%–

460Monongalia County, WVWV107,99120.6%–

461Vigo County, ININ106,51220.6%–

462Monroe County, ININ143,34520.5%–

463Cape Girardeau County, MOMO83,99920.5%–

464Snohomish County, WAWA870,65620.4%–

465Polk County, FLFL874,79020.4%–

466Doña Ana County, NMNM229,09120.2%–

467Benton County, OROR97,72820.1%–

468Waukesha County, WIWI417,21020.1%–

469Erie County, OHOH73,29620.0%–

470Forsyth County, NCNC401,71820.0%–

471Eau Claire County, WIWI109,03320.0%–

472Okaloosa County, FLFL221,81019.9%–

473Gwinnett County, GAGA1,018,09919.9%–

474Stark County, OHOH373,77119.9%–

475San Luis Obispo County, CACA282,36719.9%–

476Centre County, PAPA157,39319.8%–

477Yellowstone County, MTMT172,69219.7%–

478Ozaukee County, WIWI94,34619.7%–

479Suffolk, VAVA104,69919.6%–

480Anoka County, MNMN381,60519.5%–

481Walker County, TXTX83,84219.5%–

482Sumter County, FLFL157,77219.3%–

483Ouachita Parish, LALA158,54219.2%–

484Maui County, HIHI160,59219.1%–

485Greenville County, SCSC583,12519.1%–

486Pueblo County, COCO169,27719.0%–

487Christian County, KYKY70,11519.0%–

488Franklin County, WAWA102,61219.0%–

489Cass County, MOMO115,85918.9%–

490Alachua County, FLFL290,02818.9%–

491Lancaster County, PAPA563,15918.9%–

492Rock County, WIWI166,47218.9%–

493Northampton County, PAPA324,41118.8%–

494Guilford County, NCNC562,23418.8%–

495Midland County, TXTX187,85518.8%–

496Lebanon County, PAPA146,38018.7%–

497Lane County, OROR381,58418.5%–

498Cumberland County, NCNC338,47318.4%–

499Washington County, PAPA210,80218.4%–

500Yuba County, CACA88,69118.2%–

SHOWING 1–500 OF 847

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

Frequently asked

Which county has the highest homes on septic?

Columbia County, Florida ranks #1 with 82.1% (2025 American Community Survey 1-year estimates).

What are the top 5 counties by homes on septic?

Columbia County, Florida, Barnstable County, Massachusetts, Matanuska-Susitna, Alaska, Wilkes County, North Carolina, Mason County, Washington.

How many counties are in this ranking?

847 counties 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).