Bolthole Index county-legal census · checked 2026-08-08
Septic permitting in Illinois is handled at the county level — county health departments approve systems in 86 of 102 counties.Every entry below names the approving authority for that county, cited to the authority’s own page.
Septic rules change and some cities run their own programs — treat this as a verified starting point, not legal advice. All states → Illinois water rights & wells → Full Illinois profile →
102 counties · county health departments · permit status scouted for 10
Adams County Health Department
Adams County, IL Health Department Forms ↗Southern Seven Health Department
Southern Seven Health Department - Private Sewage Program ↗Bond County Health Department (Environmental Health)
Bond County Health Department - Environmental Health ↗Boone County Health Department - Environmental Center (under Illinois IDPH private sewage disposal code)
Boone County Health Department - Private Sewage Disposal ↗Brown County Health Department
Brown County Health Department ↗Bureau County Health Department (IDPH Private Sewage Disposal)
Bureau County - Frequently Asked Zoning Questions ↗Calhoun County Health Department
Calhoun County Health Department - Services ↗Carroll County Health Department
Carroll County Health Department ↗Cass County Health Department (under IDPH Private Sewage Disposal Code)
Cass County Health Department ↗Champaign-Urbana Public Health District (C-UPHD)
Champaign-Urbana Public Health District - Onsite Sewage Systems ↗Christian County Health Department (under Illinois Dept. of Public Health Private Sewage Disposal Code)
Illinois Dept. of Public Health - Private Sewage Disposal ↗Clark County Health Department (Illinois), Environmental Health (under Illinois Dept of Public Health)
Clark County Health Department ↗Clay County Health Department, Division of Environmental Health
Clay County Health Department - Private Sewage ↗Clinton County Health Department (Environmental Health / Private Sewage Disposal)
Clinton County Health Department - Private Sewage Disposal ↗Coles County Health Department (Environmental Health - Private Sewage)
Coles County Health Department - Environmental Sewage ↗Cook County Department of Public Health (Environmental Health)
Cook County Department of Public Health — Septic ↗Crawford County Health Department (Private Sewage program, under Illinois Department of Public Health)
Crawford County Health Department - Private Sewage ↗Cumberland County Health Department, Environmental Health (agent of IDPH)
Cumberland County Illinois Health Department - Environmental Health ↗DeWitt-Piatt Bi-County Health Department
DeWitt-Piatt Bi-County Health Department - Septic System ↗DeKalb County Health Department, Environmental Health Division
DeKalb County Health Department - Well & Septic ↗Douglas County Health Department
Douglas County Health Department Septic Systems ↗DuPage County Health Department - Environmental Health (Private Sewage Disposal program)
DuPage County Code - Private Sewage Disposal (Article III) ↗Edgar County Public Health Department (agent of IDPH under 77 Ill. Adm. Code Part 905)
Edgar County Public Health Department ↗Edwards County Health Department (agent of Illinois Department of Public Health)
Illinois Department of Public Health - Private Sewage Disposal ↗Effingham County Health Department (under Illinois DPH)
Effingham County Health Department Private Sewage ↗Fayette County Health Department - Division of Environmental Health (under Illinois Department of Public Health)
Fayette County Health Department, IL - Septic Permits & Inspections ↗Ford County Public Health Department, Well and Septic Program (under Illinois DPH)
Ford County Public Health Department — Well and Septic Program ↗Franklin-Williamson Bicounty Health Department
Franklin-Williamson Bicounty Health Department - Environmental Health ↗Fulton County Health Department, Environmental Health Division
Fulton County Health Department - Environmental Health Services ↗Egyptian Health Department (serves Gallatin, Saline, and White counties)
Egyptian Health Department - Environmental Health ↗Greene County Health Department (Environmental Health)
Greene County Health Department - Private Sewage Disposal ↗Grundy County Health Department, Environmental Health Division
Grundy County Health Department - Environmental Health ↗Hamilton County Health Department (Environmental Health / Private Sewage)
Hamilton County Health Department (IL) - Private Sewage and Water Supplies ↗Hancock County Health Department
Hancock County Health Department — Private Septic ↗Southern Seven Health Department (Private Sewage Disposal Program, under Illinois Department of Public Health)
Southern Seven Health Department - Hardin County Clinic ↗Henderson County Health Department (Environmental Health)
Henderson County Health Department - Environmental Health ↗Henry County Health Department
Henry County FAQ - Septic or Well ↗Iroquois County Public Health Department - Environmental Health
Iroquois County Environmental Health ↗Jackson County Health Department
Jackson County Health Department - Sewage ↗Jasper County Health Department, Environmental Health Division
Jasper County Health Department ↗Jefferson County Health Department (Environmental Health)
Jefferson County IL - Sewage & Water ↗Jersey County Health Department, Environmental Health
Jersey County Health Department — Environmental Programs ↗Jo Daviess County Health Department, Environmental Health (Private Sewage Disposal, under IDPH Part 905)
Jo Daviess County - Private Sewage Disposal ↗Southern 7 Health Department (Environmental Health), under Illinois Department of Public Health
Southern 7 Health Department - Private Sewage Disposal & Water Supply Program ↗Kane County Health Department, Private Sewage Program
Kane County Health Department - Septic/Sewage ↗Kankakee County Health Department (Environmental Health / Septic Program)
Kankakee County Health Department - Septic Program ↗Kendall County Health Department (Environmental Health)
Kendall County Health Department - Onsite Wastewater Systems ↗Knox County Health Department, Environmental Health (Private Sewage Disposal Program)
Knox County Health Department - Septic Systems ↗Lake County Health Department
Lake County IL - Onsite Wastewater Treatment System ↗LaSalle County Health Department, Environmental Health Division (Private Sewage Disposal Program, under Illinois DPH)
LaSalle County - Sewage Disposal ↗Lawrence County Health Department (Environmental Services)
Lawrence County Health Department - Environmental Services ↗Lee County Health Department, Environmental Health Division
Lee County Health Department - Environmental Health ↗Livingston County Health Department, Environmental Health Division
Livingston County Health Department (Private Sewage Disposal) ↗Logan County Department of Public Health, Division of Environmental Health (under IDPH)
Logan County Department of Public Health - Sewage Disposal ↗Macon County Health Department, Environmental Health
Macon County Health Department - Environmental Health ↗Macoupin County Public Health Department (Environmental Health)
Macoupin County Public Health Dept - Private Sewage Disposal Systems ↗Madison County Health Department, Environmental Health (On-Site Wastewater Septic Program)
Madison County Health Department - On-Site Wastewater Septic Program ↗Marion County Health Department, Division of Environmental Health
Marion County Health Department - Environmental Health ↗Bureau, Putnam & Marshall Health Department
Bureau, Putnam & Marshall Health Department ↗Mason County Health Department, Environmental Health
Mason County Health Department Septic Permit ↗Southern Seven Health Department (multi-county health department, agent of IDPH under 77 Ill. Adm. Code Part 905)
Southern Seven Health Department, Private Sewage Disposal Program ↗McDonough County Health Department (under IDPH 77 Ill. Adm. Code Part 905)
Illinois Department of Public Health - Private Sewage Disposal ↗McHenry County Department of Health, Environmental Health Division
McHenry County Health Department - Onsite Wastewater Treatment Systems ↗McLean County Health Department, Environmental Health Division (Private Sewage Disposal Program)
McLean County - Septic Systems ↗Menard County Health Department
Menard County IL Health Department ↗Mercer County Health Department (under Illinois Department of Public Health Private Sewage Disposal Code)
Mercer County Health Department - Programs/Environmental Health ↗Monroe County Health Department - Environmental Health
Monroe County Health Department - Private Sewage Disposal Systems ↗Montgomery County Health Department (Environmental Health), as agent under IDPH
Illinois Department of Public Health - Private Sewage Disposal ↗Morgan County Health Department, Environmental Health / Private Sewage Disposal
Morgan County Health Department - Private Sewage Disposal ↗Moultrie County Health Department - Environmental Health
Moultrie County Health Department - Environmental Health Services ↗Ogle County Health Department
Ogle County Health Department - Septic ↗Peoria City/County Health Department (Onsite Wastewater Treatment Systems)
Peoria City/County Health Department - Onsite Wastewater Treatment Systems ↗Perry County Health Department, Environmental Health (Illinois Private Sewage Disposal Code / IDPH)
Perry County Health Department - Sewage ↗DeWitt-Piatt Bi-County Health Department
DeWitt-Piatt Bi-County Health Department - Septic System ↗Pike County Health Department (agent of Illinois Department of Public Health)
Pike County Illinois - Private Sewage Disposal ↗Southern Seven Health Department
Southern Seven Health Department - Private Sewage Disposal Program ↗Southern Seven Health Department (agent of Illinois Department of Public Health)
Southern Seven Health Department - Private Sewage Disposal Program ↗Bureau, Putnam & Marshall County Health Department (agent of IDPH)
Bureau, Putnam & Marshall Health Dept - Sewage Disposal Permit ↗Randolph County Health Department (Environmental Health)
Randolph County IL — Environmental Health ↗Illinois Department of Public Health (Private Sewage Disposal Program)
Illinois DPH - Private Sewage Disposal ↗Rock Island County Health Department - Private Sewage Disposal
Rock Island County Health Department ↗Egyptian Health Department (serving Gallatin, Saline, and White counties)
Egyptian Health Department - Private Sewage ↗Sangamon County Department of Public Health, Environmental Health
Sangamon County Public Health - Environmental Health ↗Schuyler County Health Department (under Illinois DPH Private Sewage Disposal Code, 77 Ill. Adm. Code 905)
Illinois DPH - Private Sewage Disposal ↗Scott County Health Department, Environmental Health
Scott County Health Department - Environmental Health ↗Shelby County (IL) Public Health Department
Shelby County IL Public Health Department - Environmental Health ↗St. Clair County Health Department
St. Clair County Health Department - Water & Private Sewage ↗Henry & Stark County Health Department (Stark County Private Sewage Disposal Ordinance)
Henry & Stark County Health Department - Private Sewage Disposal Program ↗Stephenson County Health Department
Stephenson County Code - Sewers and Sewage Disposal ↗Tazewell County Health Department
Tazewell County Health Department - Sewage Disposal ↗Southern Seven Health Department (Union County) under IDPH Private Sewage Disposal Code, 77 Ill. Adm. Code 905
Southern Seven Health Department - Private Sewage Disposal Program ↗Vermilion County Health Department (Private Sewage Disposal Program)
Vermilion County Health Department - Private Sewage Disposal ↗Wabash County Health Department (under Illinois Dept of Public Health, 77 Ill. Adm. Code 905)
Illinois Dept of Public Health - Private Sewage Disposal ↗Warren County Health Department (Environmental Health)
Warren County Health Department - Septic Application ↗Washington County Health Department, Environmental Health (agent of Illinois DPH)
Washington County IL - Health Department ↗Wayne County Health Department, Environmental Health Unit
Wayne County Health Department - Environmental / Private Sewage ↗White County Health Department
Illinois Department of Public Health - Private Sewage Disposal ↗Whiteside County Health Department
Whiteside County Health Department ↗Will County Health Department, Private Sewage Program
Will County Health Department - Wells and Septic Systems ↗Franklin-Williamson Bicounty Health Department
Franklin-Williamson Bicounty Health Department - Environmental Health ↗Winnebago County Health Department, Wells and Septic Program
Winnebago County Health Department - Wells and Septic Program ↗Woodford County Health Department
Woodford County Septic Program ↗Every county here has a full profile — its index score, water, land prices, and the rest of its building rules. See the Illinois state page for all counties ranked, or the national septic guide.
General guidance, not legal advice. Off-grid, building, and land-use rules are often set at the county level and change often. Verify with your county and state before acting. Data reviewed 2026-06-26.
