Public water system · WY5600202
ActiveDayton, Town of
At a glance
Town of Dayton (PWSID WY5600202) is an active community water system in Sheridan County, Wyoming. It reports serving 824 people through 413 service connections. Its primary water source is 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 July 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
824
Service connections
413
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Town of Dayton compare with other water systems in Sheridan County?
By EPA's size categories, Town of Dayton is a small system (501 to 3,300 people). Sheridan County has 21 active public water systems, and Town of Dayton is the 3rd-largest of them by population served. Its population served is about 38% below the county average of 1,322 people per system, and accounts for 3% of the 27,770 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 Town of Dayton 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 50 Wyoming systems (6.5%) list surface water as their primary source.
Who owns and regulates Town of Dayton?
EPA lists Town of Dayton 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. 6 of the 21 active systems in Sheridan County (29%) are also owned by a local government.
Does Town of Dayton have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2023. The violations listed here began between February 2009 and July 2023. By type: 12 monitoring and reporting. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (4 of them). EPA lists 9 as resolved and 3 as archived. 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. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2023-07-01 | Monitoring and reportingFailure Submit Filter Profile/CPE Report · code 29 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Archived |
| 2023-05-01 | Monitoring and reportingFailure Submit Filter Profile/CPE Report · code 29 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Archived |
| 2023-04-01 | Monitoring and reportingFailure Submit Filter Profile/CPE Report · code 29 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2012-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2012-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2010-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2010-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2009-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2009-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2009-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
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.
Town of Dayton: frequently asked questions
Who runs Town of Dayton?
Town of Dayton (PWSID WY5600202) is a community water system owned by a local government. It is regulated by the WY state drinking water program.
How many people does Town of Dayton serve?
Town of Dayton reports serving 824 people through 413 service connections in Sheridan County, Wyoming.
Where does Town of Dayton get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Town of Dayton 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 July 2023. 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 Town of Dayton'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 July 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the WY state drinking water program.
Where can I find Town of Dayton's water quality report?
As a community water system, Town of Dayton 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 Sheridan County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Sheridan, City of | Sheridan | 22,700 | Community | Surface water |
| Ranchester, Town of | Sheridan | 1,297 | Community | Surface water |
| Veterans Administration Medical Center | Sheridan | 685 | Community | Surface water |
| Ucross Guest Ranch | Sheridan | 441 | Transient non-community | Groundwater |
| Downer Neighborhood I&S District | Sheridan | 400 | Community | Purchased surface water |
| Eaton'S Dude Ranch | Sheridan | 210 | Transient non-community | Groundwater |
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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, “Dayton, Town of, PWSID WY5600202, Wyoming”, https://aquacensus.com/water-systems/wyoming/dayton-town-of-wy5600202 (data as of October 1, 2026).