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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

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Active public water systems in Fremont County, Wyoming
#Water systemCountyPopulation servedTypeSource
1Riverton, City ofFremont10,330CommunitySurface water
2Lander, City ofFremont7,615CommunitySurface water
3Dubois, Town ofFremont1,822CommunityGroundwater
4Shoshoni, Town ofFremont515CommunityGroundwater
5Wy Dot-Sweetwater Rest AreaFremont500Transient non-communityGroundwater
6Hudson, Town ofFremont460CommunityGroundwater under influence of surface water
7Wydot-South Pass Rest AreaFremont401Transient non-communityGroundwater
8Gardens North Homeowners AssociationFremont300CommunityGroundwater
9Teton Valley Ranch Camp-DuboisFremont250Transient non-communityGroundwater
10Pavillion, Town ofFremont230CommunityGroundwater
11Sunridge EstatesFremont220CommunityGroundwater
12Mhvc Sixth Crossing Ranch Rv ParkFremont200Transient non-communityGroundwater
13B&K Mobile Home ParkFremont200CommunityGroundwater
14Jade MhcFremont200CommunityGroundwater
15Mountain View AcresFremont165CommunityGroundwater
16Line Shack LodgeFremont150Transient non-communityGroundwater
17First Fike SubdivisionFremont150CommunityGroundwater
18South Pass City Historical SiteFremont131Transient non-communityGroundwater
19Crooked Creek Guest RanchFremont123Transient non-communityGroundwater
20Mhvc Sage CgFremont120Transient non-communityGroundwater
21Miners Grubstake, LLCFremont103Transient non-communityGroundwater
22A & J Mobile Home ParkFremont100CommunityGroundwater
23Shoshone Nf-Falls CgFremont100Transient non-communityPurchased groundwater
24Rock Creek Hollow LDS Church CgFremont100Transient non-communityGroundwater
25Raintree EstatesFremont100CommunityGroundwater
26Longhorn Rv and MotelFremont96Transient non-communityGroundwater
27Whiskey Mountain Conservation CampFremont96Transient non-communityGroundwater
28Boysen St Pk HdqrtsFremont90Transient non-communitySurface water
29Alpine Science InstituteFremont85Non-transient non-communityGroundwater
30Twin Pines Rv ParkFremont77Transient non-communityGroundwater
31Redd Fox Park HoaFremont75CommunityPurchased surface water
32C M Ranch LLCFremont75Transient non-communityGroundwater
33Spence Foundation - Thunderhead RanchFremont72Transient non-communityGroundwater
34Fremont County Youth CampFremont70Transient non-communityGroundwater
35Warm Springs Water DistrictFremont68CommunityGroundwater
36Triangle C RanchFremont67Transient non-communityGroundwater
37Brooks Lake LodgeFremont67Transient non-communitySurface water
38Farview Water and Sewer DistrictFremont60CommunityGroundwater
39Lava Mountain LodgeFremont52Transient non-communityGroundwater
40Atlantic City MercantileFremont52Transient non-communityGroundwater under influence of surface water
41Lazy L and B RanchFremont50Transient non-communityGroundwater
42Bitterroot RanchFremont47Transient non-communityGroundwater
43Lost Cabin Gas Plant (Contango Res, LLC)Fremont45Non-transient non-communityGroundwater
44Juniper Park Water AssociationFremont42CommunityGroundwater
45Jeffrey City Water & Sewer DistrictFremont40CommunityGroundwater
46Paintbrush MotelFremont40Transient non-communityGroundwater
47Pleasant Valley Water AssociationFremont35CommunityGroundwater
48Absaroka RanchFremont35Transient non-communityGroundwater
49Ring Lake RanchFremont34Transient non-communityGroundwater
50Second Fike SubdivisionFremont34CommunityGroundwater

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).