Public water system · WY5600047
ActiveRiverton, City of
At a glance
City of Riverton (PWSID WY5600047) is an active community water system in Fremont County, Wyoming. It reports serving 10,330 people through 4,300 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in January 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
10,330
Service connections
4,300
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does City of Riverton compare with other water systems in Fremont County?
By EPA's size categories, City of Riverton is a large system (10,001 to 100,000 people). Fremont County has 61 active public water systems, and City of Riverton is the largest of them by population served. Its population served is about 24 times the county average of 433 people per system, and accounts for 39% of the 26,380 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 City of Riverton is about 54% above 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 City of Riverton?
EPA lists City of Riverton 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. 8 of the 61 active systems in Fremont County (13%) are also owned by a local government.
Does City of Riverton have drinking water violations?
EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in January 2025. The violations listed here began between July 1976 and January 2025. By type: 7 monitoring and reporting and 2 required treatment not met. The contaminant or rule involved most often is Long Term 2 Enhanced Surface Water Treatment Rule (2 of them). EPA lists 5 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 |
|---|---|---|---|---|
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | No | Resolved |
| 2023-06-01 | Required treatment not metFailure To Address Deficiency · code 45 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbofurancode 2046 | No | Archived |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Oxamylcode 2036 | No | Archived |
| 2021-05-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2004-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 1994-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 1976-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
| 1976-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Archived |
All 9 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.
City of Riverton: frequently asked questions
Who runs City of Riverton?
City of Riverton (PWSID WY5600047) is a community water system owned by a local government. It is regulated by the WY state drinking water program.
How many people does City of Riverton serve?
City of Riverton reports serving 10,330 people through 4,300 service connections in Fremont County, Wyoming.
Where does City of Riverton 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 City of Riverton have any drinking water violations?
EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in January 2025. 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 City of Riverton'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. EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in January 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the WY state drinking water program.
Where can I find City of Riverton's water quality report?
As a community water system, City of Riverton 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 Fremont County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Lander, City of | Fremont | 7,615 | Community | Surface water |
| Dubois, Town of | Fremont | 1,822 | Community | Groundwater |
| Shoshoni, Town of | Fremont | 515 | Community | Groundwater |
| Wy Dot-Sweetwater Rest Area | Fremont | 500 | Transient non-community | Groundwater |
| Hudson, Town of | Fremont | 460 | Community | Groundwater under influence of surface water |
| Wydot-South Pass Rest Area | Fremont | 401 | 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, “Riverton, City of, PWSID WY5600047, Wyoming”, https://aquacensus.com/water-systems/wyoming/riverton-city-of-wy5600047 (data as of October 1, 2026).