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Big Horn County, Wyoming — public water systems

At a glance

28 active public water systems are filed under Big Horn County, Wyoming in EPA's SDWIS records, together reporting 10,387 people served. The largest is Town of Lovell, which reports serving 2,250 people. 15 are community water systems serving people where they live; the other 13 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

28

Population served

10.4K

Community systems

15

Groundwater share

82.1%

How does Big Horn County compare with other Wyoming counties?

Big Horn County has the 9th-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 10,387 people served in total, the 14th-largest county figure in the state and 1.6% of the statewide total. The average system here reports serving 371 people, about 56% below 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 Big Horn County's drinking water come from?

By primary water source, Big Horn County's active systems draw on groundwater (16, 57%), purchased groundwater (7, 25%), purchased surface water (4, 14%) and surface water (1, 3.6%). Overall, 82% rely mainly on groundwater (including purchased groundwater) and 18% 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, Town of Lovell, draws primarily on purchased surface water.

What kinds of water systems operate in Big Horn County?

Big Horn County's active systems break down as 15 community systems (54%), 3 non-transient non-community systems (11%) and 10 transient non-community systems (36%). 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 local government (43%), private (32%), federal government (21%) and state government (3.6%).

Water systems in Big Horn County

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Active public water systems in Big Horn County, Wyoming
#Water systemCountyPopulation servedTypeSource
1Lovell, Town ofBig Horn2,250CommunityPurchased surface water
2Greybull, Town ofBig Horn2,080CommunityGroundwater
3Basin, Town ofBig Horn1,250CommunityPurchased groundwater
4South Big Horn County JpbBig Horn900CommunityGroundwater
5Cowley, Town ofBig Horn800CommunityGroundwater
6Byron, Town ofBig Horn561CommunityPurchased surface water
7Antelope Butte Ski AreaBig Horn527Transient non-communitySurface water
8Burlington, Town ofBig Horn348CommunityPurchased groundwater
9Deaver Municipal Water SystemBig Horn176CommunityPurchased surface water
10Frannie, Town ofBig Horn160CommunityPurchased surface water
11South End Water Users S&I DistrictBig Horn150CommunityPurchased groundwater
12Shell Town Water Improvement DistrictBig Horn120CommunityPurchased groundwater
13Medicine Lodge St Hist SiteBig Horn115Transient non-communityGroundwater
14Manderson, Town ofBig Horn110CommunityPurchased groundwater
15Bhnf-Sitting Bull CgBig Horn100Transient non-communityGroundwater
16Bhnf-Boulder Park CgBig Horn100Transient non-communityGroundwater
17American Colloid CompanyBig Horn93Non-transient non-communityGroundwater
18Georgia-Pacific Gypsum LLCBig Horn90Non-transient non-communityGroundwater
19Greybull Heights Water UsersBig Horn84CommunityPurchased groundwater
20Bentonite Performance Minerals/LovellBig Horn68Non-transient non-communityGroundwater
21Hyattville S&I DistrictBig Horn60CommunityGroundwater
22Scharen SubdivisionBig Horn50CommunityPurchased groundwater
23Bighorn Canyon Nat'L Rec. AreaBig Horn40Transient non-communityGroundwater
24Bhnf-Ranger Creek CgBig Horn40Transient non-communityGroundwater
25Wyoming High Country, LLCBig Horn35Transient non-communityGroundwater
26Bighorn Nf-Tyrrell Work CenterBig Horn30Transient non-communityGroundwater
27Blm - Five Springs CampgroundBig Horn25Transient non-communityGroundwater
28Camp PaintrockBig Horn25Transient non-communityGroundwater

Also serving Big Horn County

These systems serve several counties, including Big Horn County. EPA lists another county first for them, so they are not included in the counts above.

Multi-county water systems that also serve Big Horn County, Wyoming
Water systemCountyPopulation servedTypeSource
Bighorn Resort LLCWashakie + 1 more154Transient non-communityGroundwater

Big Horn County water systems: frequently asked questions

How many public water systems are in Big Horn County, Wyoming?

EPA's SDWIS records file 28 active public water systems under Big Horn County, Wyoming: 15 community systems (54%), 3 non-transient non-community systems (11%) and 10 transient non-community systems (36%). At least 1 more system is listed under another county but also serve Big Horn County.

Who supplies drinking water in Big Horn County, WY?

The largest community water systems filed under Big Horn County are Town of Lovell (2,250 people served), Town of Greybull (2,080 people served) and Town of Basin (1,250 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 Big Horn County's drinking water come from groundwater or surface water?

Of the 28 active public water systems in Big Horn County, 82% draw mainly on groundwater and 18% on surface water, counting purchased supplies. The largest system, Town of Lovell, uses purchased surface water.

Where can I find a water quality report for Big Horn 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. 15 community systems are filed under Big Horn 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 Big Horn 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 Big Horn County, Wyoming”, https://aquacensus.com/water-systems/wyoming/big-horn (data as of October 1, 2026).