Bolthole Index county-legal census · checked 2026-08-08
Septic permitting in Colorado is handled at the county level — county health departments approve systems in 57 of 64 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 → Colorado water rights & wells → Full Colorado profile →
64 counties · county health departments · permit status scouted for 3
Adams County Health Department - Environmental Health (Water Quality / OWTS program)
Adams County Health Department - Septic Systems ↗Alamosa County Land Use and Building Department (OWTS under Colorado Regulation 43 / CDPHE)
Alamosa County Building Department - OWTS ↗Arapahoe County Public Health - Environmental Health
Arapahoe County Public Health - Septic Systems ↗Archuleta County Water Quality Department (Development Services)
Archuleta County - Septic System Information ↗Baca County (local public health agency under CDPHE Regulation 43)
Baca County Colorado - Zoning Permits and Land Use ↗Bent County Public Health
Bent County Public Health - Public Health Services ↗Boulder County Public Health
Boulder County Public Health - OWTS Regulations ↗Broomfield Health Protection Division / Board of Health
Broomfield OWTS / Septic Systems ↗Chaffee County Building Department (Development Services / Environmental Health)
Chaffee County Building Department Applications and Fees (OWTS) ↗Cheyenne County Public Health
Cheyenne County — Zoning & Planning/Land Use (OWTS referral) ↗Clear Creek County Environmental Health Department
Clear Creek County - Onsite Wastewater Treatment Systems ↗Conejos County Land Use / Board of Health (OWTS under CDPHE Regulation 43)
Conejos County - Land Use (OWTS) ↗Costilla County Planning and Zoning / Environmental Health (OWTS)
Costilla County OWTS Application ↗Otero County Health Department (serving Crowley County)
Crowley County - Planning, Zoning and Building Inspection ↗Custer County Planning & Zoning / Environmental Health (OWTS program)
Custer County CO - Building Permits & Applications (OWTS) ↗Delta County Environmental Health (Public Health)
Delta County Septic Systems (OWTS) ↗Denver Department of Public Health & Environment
CDPHE – On-site Wastewater Treatment Systems (local agency permitting) ↗Dolores County (Septic Inspector; OWTS under CDPHE Regulation 43)
Dolores County - Septic Application ↗Douglas County Health Department (On-site Wastewater Treatment System Regulation)
Douglas County Health Department - Septic Systems ↗Eagle County Environmental Health
Eagle County Environmental Health - Water & Waste Water ↗El Paso County Public Health - Onsite Wastewater Treatment Systems (OWTS) Program
El Paso County Public Health - Onsite Wastewater Treatment Systems ↗Elbert County Public Health and Environment (ECPHE) - OWTS
Elbert County Public Health and Environment ↗Fremont County Building Department / Public Health & Environment (OWTS program)
Fremont County Septic Systems ↗Garfield County Public Health - Environmental Health Division
Garfield County Onsite Wastewater Treatment Systems ↗Gilpin County Community Development / Public Health Agency (OWTS under CDPHE Regulation 43)
Gilpin County - Septic and Well Information ↗Grand County Building & Sanitation Division (Grand County Sanitarian)
Grand County Septic Permit Information ↗Gunnison County Community and Economic Development Department
Gunnison County Community and Economic Development ↗Hinsdale County Building Department (OWTS Program)
Hinsdale County Building Department - OWTS ↗Las Animas-Huerfano Counties District Health Department (OWTS program under CDPHE Reg 43)
Las Animas-Huerfano Counties District Health Department OWTS Program ↗Jackson County Environmental Health (OWTS)
Colorado CDPHE - On-site Wastewater Treatment Systems ↗Jefferson County Public Health (Onsite Wastewater Treatment Systems program)
Jefferson County Public Health - Onsite Wastewater Treatment Systems ↗Kiowa County Public Health (under CDPHE Regulation 43)
Kiowa County Colorado - Public Health ↗Kit Carson County Public Health and Environment (Environmental Health)
Kit Carson County Land Use Department ↗La Plata County Public Health, Environmental Health Division
La Plata County Public Health - Septic Systems ↗Lake County Public Health Agency / Community Planning & Development (OWTS under CDPHE)
Lake County - Septic System Permitting ↗Larimer County Department of Health and Environment (OWTS program)
Larimer County - Septic Systems (OWTS) ↗Las Animas-Huerfano Counties District Health Department, Environmental Health (OWTS Program)
Las Animas-Huerfano Counties District Health Department - OWTS Program ↗Lincoln County (local public health agency / Land Use Office) under CDPHE Regulation 43
Colorado Department of Public Health and Environment - OWTS ↗Northeast Colorado Health Department (NCHD)
Northeast Colorado Health Department - OWTS ↗Mesa County Community Development - OWTS (On-Site Wastewater Treatment Systems)
Mesa County Septic Systems Resources ↗Mineral County Land Use Office
Mineral County — On-Site Wastewater Treatment System (OWTS) ↗Craig/Moffat Regional Building Department
Moffat County - Building Permit Information ↗Montezuma County Environmental Health Department (OWTS under CDPHE Regulation 43 plus local regulations)
Montezuma County - Environmental Health ↗Montrose County Board of Health / Montrose County Public Health (OWTS program)
Montrose County Board of Health Resolution - On-Site Wastewater Treatment Systems ↗Northeast Colorado Health Department (NCHD), OWTS program under CDPHE Reg 43
Northeast Colorado Health Department OWTS Program ↗Otero County Environmental Health Services (OWTS under CDPHE Regulation 43)
Otero County - Onsite Wastewater Treatment Systems ↗Ouray County Land Use Department
Ouray County Land Use Department - Building Information ↗Park County Environmental Health Department
Park County - Environmental Health ↗Northeast Colorado Health Department (NCHD) - serves Logan, Phillips & Sedgwick Counties
Northeast Colorado Health Department - Septic Permit Application ↗Pitkin County Environmental Health
Pitkin County OWTS Information ↗Prowers County Public Health and Environment - Environmental Health
Prowers County Environmental Health Services ↗Pueblo Department of Public Health and Environment (under CDPHE)
Pueblo County Public Health - Onsite Wastewater Treatment System ↗Rio Blanco County OWTS / Environmental Health
Rio Blanco County - OWTS / Septic ↗Rio Grande County Department of Building Safety
Rio Grande County Building Department ↗Routt County Department of Environmental Health
Routt County - Septic Permitting Information ↗Saguache County Land Use Office
Saguache County OWTS/Septic Application ↗San Juan County Environmental Health (OWTS permitting administered with La Plata County Public Health)
San Juan County Colorado - Environmental Health ↗San Miguel County OWTS / Environmental Health (under CDPHE)
San Miguel County On-Site Wastewater Treatment Systems ↗Northeast Colorado Health Department (NCHD)
Northeast Colorado Health Department - OWTS ↗Summit County Environmental Health Department (Public Health)
Summit County CO — Onsite Wastewater Treatment Systems (OWTS) ↗Teller County Public Health and Environment (Board of Health, Regulation 43)
Teller County - Septic Services ↗Northeast Colorado Health Department
Northeast Colorado Health Department - OWTS ↗Weld County Department of Public Health and Environment - Environmental Health Services
Weld County Environmental Health - Septic Systems (OWTS) ↗Northeast Colorado Health Department (OWTS Program)
Northeast Colorado Health Department - Onsite Wastewater Treatment System ↗Every county here has a full profile — its index score, water, land prices, and the rest of its building rules. See the Colorado 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.
