Public water system · WY5600016
ActiveDeaver Municipal Water System
At a glance
Deaver Municipal Water System (PWSID WY5600016) is an active community water system in Big Horn County, Wyoming. It reports serving 176 people through 123 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in March 2012.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
176
Service connections
123
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Deaver Municipal Water System compare with other water systems in Big Horn County?
By EPA's size categories, Deaver Municipal Water System is a very small system (500 people or fewer). Big Horn County has 28 active public water systems. Its population served is about half of the county average of 371 people per system, and accounts for 1.7% of the 10,387 people reported by systems filed under the county. Across Wyoming, the 775 active systems average 838 people each. Nationally, the average active community water system reports serving 6,703 people, so Deaver Municipal Water System is well below that figure.
What does “community water system” mean?
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. Wyoming has 332 active community water systems, 43% of the state's 775 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 79 Wyoming systems (10%) list purchased surface water as their primary source.
Who owns and regulates Deaver Municipal Water System?
EPA lists Deaver Municipal Water System as owned by a local government. The WY state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 12 of the 28 active systems in Big Horn County (43%) are also owned by a local government.
Does Deaver Municipal Water System have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in March 2012. The violations listed here began between August 1982 and March 2012. By type: 11 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 of them). EPA lists 8 as archived and 4 as resolved. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2012-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2010-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2010-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2008-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2007-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2005-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1992-11-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1982-08-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Archived |
| 1982-08-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 1982-08-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Archived |
| 1982-08-01 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Archived |
| 1982-08-01 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Archived |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Deaver Municipal Water System: frequently asked questions
Who runs Deaver Municipal Water System?
Deaver Municipal Water System (PWSID WY5600016) is a community water system owned by a local government. It is regulated by the WY state drinking water program.
How many people does Deaver Municipal Water System serve?
Deaver Municipal Water System reports serving 176 people through 123 service connections in Big Horn County, Wyoming.
Where does Deaver Municipal Water System get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Deaver Municipal Water System have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in March 2012. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Deaver Municipal Water System's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in March 2012. For current results, consult the system's annual water quality report, EPA ECHO, or the WY state drinking water program.
Where can I find Deaver Municipal Water System's water quality report?
As a community water system, Deaver Municipal Water System must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Big Horn County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Lovell, Town of | Big Horn | 2,250 | Community | Purchased surface water |
| Greybull, Town of | Big Horn | 2,080 | Community | Groundwater |
| Basin, Town of | Big Horn | 1,250 | Community | Purchased groundwater |
| South Big Horn County Jpb | Big Horn | 900 | Community | Groundwater |
| Cowley, Town of | Big Horn | 800 | Community | Groundwater |
| Byron, Town of | Big Horn | 561 | Community | Purchased surface water |
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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, “Deaver Municipal Water System, PWSID WY5600016, Wyoming”, https://aquacensus.com/water-systems/wyoming/deaver-municipal-water-system-wy5600016 (data as of October 1, 2026).