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Crook County, Wyoming — public water systems

At a glance

27 active public water systems are filed under Crook County, Wyoming in EPA's SDWIS records, together reporting 8,854 people served. The largest is Devils Tower National Monument, which reports serving 3,071 people. 7 are community water systems serving people where they live; the other 20 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

27

Population served

8.9K

Community systems

7

Groundwater share

100%

How does Crook County compare with other Wyoming counties?

Crook County has the 12th-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 8,854 people served in total, the 17th-largest county figure in the state and 1.4% of the statewide total. The average system here reports serving 328 people, about 61% 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 Crook County's drinking water come from?

By primary water source, Crook County's active systems draw on groundwater (25, 93%), purchased groundwater (1, 3.7%) and groundwater under influence of surface water (1, 3.7%). Overall, all rely mainly on groundwater (including purchased groundwater) and none 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, Devils Tower National Monument, draws primarily on groundwater.

What kinds of water systems operate in Crook County?

Crook County's active systems break down as 7 community systems (26%), 4 non-transient non-community systems (15%) and 16 transient non-community systems (59%). 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 (59%), local government (19%), state government (11%) and federal government (7.4%).

Water systems in Crook County

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Active public water systems in Crook County, Wyoming
#Water systemCountyPopulation servedTypeSource
1Devils Tower National MonumentCrook3,071Transient non-communityGroundwater
2Sundance, City ofCrook1,279CommunityGroundwater
3Moorcroft, Town ofCrook1,009CommunityGroundwater
4Devils Tower Koa-CampstoolCrook516Transient non-communityGroundwater
5Pine Haven, Town ofCrook498CommunityGroundwater
6Hulett, Town ofCrook420CommunityGroundwater
7State Line StationCrook305Transient non-communityGroundwater
8Devil'S Tower Trading PostCrook215Transient non-communityGroundwater
9Bentonite Performance Minerals - ColonyCrook180Non-transient non-communityGroundwater
10Black Hills Nf-Cook Lake CgCrook165Transient non-communityGroundwater
11Vista West Improvement & Serv DistrictCrook120CommunityGroundwater
12Sand Creek Trading PostCrook110Transient non-communityGroundwater
13Keyhole St Park HeadquartersCrook100Transient non-communityGroundwater
14Keyhole St Park Cottonwood CgCrook100Transient non-communityGroundwater
15Beulah CampgroundCrook99Transient non-communityGroundwater
16Devils Tower Forest ProductsCrook90Non-transient non-communityGroundwater
17Vore Buffalo Jump FoundationCrook85Transient non-communityGroundwater
18Wy Trans Dept Aladdin Welcome CtrCrook75Transient non-communityGroundwater
19Aladdin, Town ofCrook62Transient non-communityGroundwater
20American Colloid-Colony WestCrook60Non-transient non-communityGroundwater
21Keyhole Resort/MarinaCrook50Transient non-communityPurchased groundwater
22Beulah Land WaterCrook50CommunityGroundwater
23American Colloid-Colony EastCrook45Non-transient non-communityGroundwater
24Devils Tower ViewCrook43Transient non-communityGroundwater
25Ranch ACrook40Transient non-communityGroundwater under influence of surface water
26Devils Tower GulchCrook34Transient non-communityGroundwater
27Buckmiller Enterprises, LLCCrook33CommunityGroundwater

Crook County water systems: frequently asked questions

How many public water systems are in Crook County, Wyoming?

EPA's SDWIS records file 27 active public water systems under Crook County, Wyoming: 7 community systems (26%), 4 non-transient non-community systems (15%) and 16 transient non-community systems (59%).

Who supplies drinking water in Crook County, WY?

The largest community water systems filed under Crook County are City of Sundance (1,279 people served), Town of Moorcroft (1,009 people served) and Town of Pine Haven (498 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 Crook County's drinking water come from groundwater or surface water?

Of the 27 active public water systems in Crook County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Devils Tower National Monument, uses groundwater.

Where can I find a water quality report for Crook 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. 7 community systems are filed under Crook 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 Crook 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 Crook County, Wyoming”, https://aquacensus.com/water-systems/wyoming/crook (data as of October 1, 2026).