Fremont County, Wyoming — public water systems
At a glance
61 active public water systems are filed under Fremont County, Wyoming in EPA's SDWIS records, together reporting 26,380 people served. The largest is City of Riverton, which reports serving 10,330 people. 21 are community water systems serving people where they live; the other 40 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
61
Population served
26.4K
Community systems
21
Groundwater share
91.8%
How does Fremont County compare with other Wyoming counties?
Fremont County has the 3rd-most active public water systems among the 33 counties listed for active Wyoming systems in EPA records; among the 23 with 3 or more systems, the median has 27. Its systems report 26,380 people served in total, the 9th-largest county figure in the state and 4.1% of the statewide total. The average system here reports serving 433 people, about half of the Wyoming average of 838. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Fremont County's drinking water come from?
By primary water source, Fremont County's active systems draw on groundwater (53, 87%), surface water (4, 6.6%), groundwater under influence of surface water (2, 3.3%) and purchased surface water (1, 1.6%). Overall, 92% rely mainly on groundwater (including purchased groundwater) and 8.2% on surface water, compared with 83% and 17% across Wyoming. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, City of Riverton, draws primarily on surface water.
What kinds of water systems operate in Fremont County?
Fremont County's active systems break down as 21 community systems (34%), 2 non-transient non-community systems (3.3%) and 38 transient non-community systems (62%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (61%), state government (18%), local government (13%) and federal government (8.2%).
The 50 largest water systems in Fremont County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Riverton, City of | Fremont | 10,330 | Community | Surface water |
| 2 | Lander, City of | Fremont | 7,615 | Community | Surface water |
| 3 | Dubois, Town of | Fremont | 1,822 | Community | Groundwater |
| 4 | Shoshoni, Town of | Fremont | 515 | Community | Groundwater |
| 5 | Wy Dot-Sweetwater Rest Area | Fremont | 500 | Transient non-community | Groundwater |
| 6 | Hudson, Town of | Fremont | 460 | Community | Groundwater under influence of surface water |
| 7 | Wydot-South Pass Rest Area | Fremont | 401 | Transient non-community | Groundwater |
| 8 | Gardens North Homeowners Association | Fremont | 300 | Community | Groundwater |
| 9 | Teton Valley Ranch Camp-Dubois | Fremont | 250 | Transient non-community | Groundwater |
| 10 | Pavillion, Town of | Fremont | 230 | Community | Groundwater |
| 11 | Sunridge Estates | Fremont | 220 | Community | Groundwater |
| 12 | Mhvc Sixth Crossing Ranch Rv Park | Fremont | 200 | Transient non-community | Groundwater |
| 13 | B&K Mobile Home Park | Fremont | 200 | Community | Groundwater |
| 14 | Jade Mhc | Fremont | 200 | Community | Groundwater |
| 15 | Mountain View Acres | Fremont | 165 | Community | Groundwater |
| 16 | Line Shack Lodge | Fremont | 150 | Transient non-community | Groundwater |
| 17 | First Fike Subdivision | Fremont | 150 | Community | Groundwater |
| 18 | South Pass City Historical Site | Fremont | 131 | Transient non-community | Groundwater |
| 19 | Crooked Creek Guest Ranch | Fremont | 123 | Transient non-community | Groundwater |
| 20 | Mhvc Sage Cg | Fremont | 120 | Transient non-community | Groundwater |
| 21 | Miners Grubstake, LLC | Fremont | 103 | Transient non-community | Groundwater |
| 22 | A & J Mobile Home Park | Fremont | 100 | Community | Groundwater |
| 23 | Shoshone Nf-Falls Cg | Fremont | 100 | Transient non-community | Purchased groundwater |
| 24 | Rock Creek Hollow LDS Church Cg | Fremont | 100 | Transient non-community | Groundwater |
| 25 | Raintree Estates | Fremont | 100 | Community | Groundwater |
| 26 | Longhorn Rv and Motel | Fremont | 96 | Transient non-community | Groundwater |
| 27 | Whiskey Mountain Conservation Camp | Fremont | 96 | Transient non-community | Groundwater |
| 28 | Boysen St Pk Hdqrts | Fremont | 90 | Transient non-community | Surface water |
| 29 | Alpine Science Institute | Fremont | 85 | Non-transient non-community | Groundwater |
| 30 | Twin Pines Rv Park | Fremont | 77 | Transient non-community | Groundwater |
| 31 | Redd Fox Park Hoa | Fremont | 75 | Community | Purchased surface water |
| 32 | C M Ranch LLC | Fremont | 75 | Transient non-community | Groundwater |
| 33 | Spence Foundation - Thunderhead Ranch | Fremont | 72 | Transient non-community | Groundwater |
| 34 | Fremont County Youth Camp | Fremont | 70 | Transient non-community | Groundwater |
| 35 | Warm Springs Water District | Fremont | 68 | Community | Groundwater |
| 36 | Triangle C Ranch | Fremont | 67 | Transient non-community | Groundwater |
| 37 | Brooks Lake Lodge | Fremont | 67 | Transient non-community | Surface water |
| 38 | Farview Water and Sewer District | Fremont | 60 | Community | Groundwater |
| 39 | Lava Mountain Lodge | Fremont | 52 | Transient non-community | Groundwater |
| 40 | Atlantic City Mercantile | Fremont | 52 | Transient non-community | Groundwater under influence of surface water |
| 41 | Lazy L and B Ranch | Fremont | 50 | Transient non-community | Groundwater |
| 42 | Bitterroot Ranch | Fremont | 47 | Transient non-community | Groundwater |
| 43 | Lost Cabin Gas Plant (Contango Res, LLC) | Fremont | 45 | Non-transient non-community | Groundwater |
| 44 | Juniper Park Water Association | Fremont | 42 | Community | Groundwater |
| 45 | Jeffrey City Water & Sewer District | Fremont | 40 | Community | Groundwater |
| 46 | Paintbrush Motel | Fremont | 40 | Transient non-community | Groundwater |
| 47 | Pleasant Valley Water Association | Fremont | 35 | Community | Groundwater |
| 48 | Absaroka Ranch | Fremont | 35 | Transient non-community | Groundwater |
| 49 | Ring Lake Ranch | Fremont | 34 | Transient non-community | Groundwater |
| 50 | Second Fike Subdivision | Fremont | 34 | Community | Groundwater |
All other water systems in Fremont County (11)
The remaining active systems filed under Fremont County, largest first, with the population each reports serving.
Fremont County water systems: frequently asked questions
How many public water systems are in Fremont County, Wyoming?
EPA's SDWIS records file 61 active public water systems under Fremont County, Wyoming: 21 community systems (34%), 2 non-transient non-community systems (3.3%) and 38 transient non-community systems (62%).
Who supplies drinking water in Fremont County, WY?
The largest community water systems filed under Fremont County are City of Riverton (10,330 people served), City of Lander (7,615 people served) and Town of Dubois (1,822 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Fremont County's drinking water come from groundwater or surface water?
Of the 61 active public water systems in Fremont County, 92% draw mainly on groundwater and 8.2% on surface water, counting purchased supplies. The largest system, City of Riverton, uses surface water.
Where can I find a water quality report for Fremont County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 21 community systems are filed under Fremont County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Fremont County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More Wyoming water systems
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Public water systems in Fremont County, Wyoming”, https://aquacensus.com/water-systems/wyoming/fremont (data as of October 1, 2026).