Bolthole Index county-legal census · checked 2026-07-08
Septic permitting in Wyoming is handled at the county level — county health departments approve systems in 19 of 23 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 → Wyoming water rights & wells → Full Wyoming profile →
23 counties · county health departments · permit status scouted for 2
Albany County Planning Department (Small Wastewater / Water & Wastewater program, under WY DEQ Water Quality Division framework)
Albany County - Water & Wastewater ↗Big Horn County Land Planning Department (small wastewater systems, delegated under WY DEQ)
Big Horn County - Septic Systems ↗Campbell County Public Works (Building, Planning & Zoning) - delegated by Wyoming DEQ
Campbell County - Small Wastewater (Septic) Systems ↗Wyoming Department of Environmental Quality (WY DEQ), Water Quality Division
WY DEQ Small Wastewater Systems ↗Converse County (Minimum Standards Governing Individual Small Wastewater Systems)
Converse County Minimum Standards for Small Wastewater Systems ↗Crook County Planning (Growth & Development)
Crook County Small Wastewater (Septic Systems) ↗Fremont County Planning Department - Small Wastewater program (systems <2,000 gpd; WY DEQ handles larger)
Fremont County - Building Codes & Certificates of Occupancy ↗Goshen County Planning & GIS (small wastewater under DEQ delegation)
Wyoming DEQ - Small Wastewater Systems ↗Hot Springs County Planning Office
Hot Springs County - Planner ↗Johnson County Planning Department (Small Wastewater / Septic Permitting)
Johnson County WY — Septic System Permitting ↗Laramie County Division of Environmental Health
Wyoming DEQ - Small Wastewater Systems ↗Lincoln County Office of Planning & Development
Lincoln County Office of Planning & Development ↗Casper-Natrona County Health Department, Environmental Health Division
Natrona County Small Wastewater System Regulations (Casper-Natrona County Health Dept) ↗Wyoming Department of Environmental Quality, Water Quality Division
Wyoming DEQ - Small Wastewater Systems ↗Park County Planning & Zoning (Small Wastewater Systems Administrator)
Park County Planning & Zoning - Small Wastewater Systems ↗Wyoming Department of Environmental Quality (DEQ), Water Quality Division - Small Wastewater Systems
Platte County - Planning & Zoning FAQs ↗Sheridan County Public Works Department
Sheridan County Public Works Department ↗Sublette County Planning & Zoning Department (delegated by Wyoming DEQ)
Sublette County Planning & Zoning ↗Sweetwater County Environmental Health (District Board of Health)
Sweetwater County Land Use Office ↗Teton County Engineering Department (Sanitarian) under WY DEQ Title 9
Teton County - Small Wastewater Facility Permit Portal ↗Uinta County Planning & Zoning (Small Wastewater program)
Uinta County - Wastewater / Septic System ↗Washakie County Planner (Small Wastewater, DEQ-delegated)
Wyoming DEQ — Small Wastewater Systems (permitting authority) ↗Wyoming Department of Environmental Quality (DEQ), Small Wastewater Systems
Wyoming DEQ - Small Wastewater Systems ↗Every county here has a full profile — its index score, water, land prices, and the rest of its building rules. See the Wyoming 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.
