Hot Springs County, Wyoming
Town of Thermopolis is a town in Hot Springs County, Wyoming. Town of Thermopolis adopts its own zoning, so inside its limits Town of Thermopolis’s rules apply, not the county’s. Septic permits inside Town of Thermopolis come from the county and state together. 20 rules below are quoted from official sources and independently re-checked, most recently on November 11, 2026. Rules for unincorporated land are on the Hot Springs County page.
Building construction inside Thermopolis town
“current codes in effect for the town of thermopolis, ordinance no. 884, effective may 8, 2026”
Land inside Thermopolis town limits
“uses-by-right are subject to the riverfront performance standards and to a lot coverage limitation of 5%.”
Zoning districts inside Thermopolis town
“the ldr is established to protect stable neighborhoods of detached singlefamily dwellings with relatively low land use intensities.”
Low Density Residential (LDR) district, inside Thermopolis town
minimum lot area: >= 7000 sq ft · minimum lot width: >= 60 ft
“river channel stabilization or modification 7000 60 ft 20 ft 10 ft 5 ft 40% 30 ft.”
“mdr as in ldr as in ldr plus two plus high family density dwellings residential 5000 50 ft. 20 ft. 10 ft. 5 ft. 60% 30 ft.”
“gr as in mdr as in mdr plus mobile plus nursing homes on homes, lots rooming houses, 4200 45 ft. 20 ft. 10 ft. 5 ft. 60% 40 ft.”
General Residential (GR) district, inside Thermopolis town
front yard: >= 20 ft · rear yard: >= 10 ft · side yard: >= 5 ft
“gr as in mdr as in mdr plus mobile plus nursing homes on homes, lots rooming houses, 4200 45 ft. 20 ft. 10 ft. 5 ft. 60% 40 ft.”
“river channel stabilization or modification 7000 60 ft 20 ft 10 ft 5 ft 40% 30 ft.”
“mdr as in ldr as in ldr plus two plus high family density dwellings residential 5000 50 ft. 20 ft. 10 ft. 5 ft. 60% 30 ft.”
Agricultural (AG) district, inside Thermopolis town
lot coverage limitation: <= 5 percent
“uses-by-right are subject to the riverfront performance standards and to a lot coverage limitation of 5%.”
“river channel stabilization or modification 7000 60 ft 20 ft 10 ft 5 ft 40% 30 ft.”
“mdr as in ldr as in ldr plus two plus high family density dwellings residential 5000 50 ft. 20 ft. 10 ft. 5 ft. 60% 30 ft.”
General Residential (GR) district, inside Thermopolis town (MDR is 30 ft)
maximum building height: <= 40 ft
“gr as in mdr as in mdr plus mobile plus nursing homes on homes, lots rooming houses, 4200 45 ft. 20 ft. 10 ft. 5 ft. 60% 40 ft.”
“river channel stabilization or modification 7000 60 ft 20 ft 10 ft 5 ft 40% 30 ft.”
Mobile/manufactured homes in the General Residential (GR) district inside Thermopolis town
“the gr is established to include transitional residential areas where conventional and mobile homes are mixed, along with higher density residential uses and some nonconforming businesses.”
Private sewage disposal systems inside Thermopolis town where public sewer is unavailable
“before commencement of construction of a private sewage disposal system, the owner shall first obtain a written permit signed by the town engineer.”
Private sewage disposal systems inside Thermopolis town
minimum lot area for subsurface soil absorption system: >= 43560 sq ft
“no permit shall be issued for any private sewage disposal system employing subsurface soil absorption facilities where the area of the lot is less than 43,560 square feet.”
Privies, septic tanks and cesspools inside Thermopolis town
“except as hereinafter provided, it shall be unlawful to construct or maintain any privy, privy vault, septic tank, cesspool, or other facility intended or used for the disposal of sewage.”
Existing buildings for human occupancy abutting a street, alley or right of way with a town public sewer, inside Thermopolis town
sewer distance to property line: <= 100 ft · time to connect after notice: 90 days
“is hereby required at his expense to install suitable toilet facilities therein, and to connect such facilities directly with the proper public sewer in accordance with the provisions of this article, within 90 days after date of official notice to do so, provided that said public sewer is within 100 feet of the property line.”
Subdivisions inside Thermopolis town
“no subdivision shall be permitted which is not connected to the town sewage treatment system.”
We looked and could not find an official answer yet. Silence is not permission; ask Town of Thermopolis or Hot Springs County directly.
Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.
Unanswered questions are usually a sign that Town of Thermopolis publishes no rule on the point, not that none exists. Hot Springs County’s page lists the county offices to call.
Off-grid gear
Going off-grid in Town of Thermopolis means bringing your own water and power. The kit we’d start with:
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