Public water system · WY5600432
ActiveAtlantic City Mercantile
At a glance
Atlantic City Mercantile (PWSID WY5600432) is an active transient non-community water system in Fremont County, Wyoming. It reports serving 52 people through 5 service connections. Its primary water source is groundwater under influence of surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in June 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
52
Service connections
5
Primary source
GU
Groundwater under influence of surface water
System type
TNCWS
Transient non-community water system
System record
How does Atlantic City Mercantile compare with other water systems in Fremont County?
By EPA's size categories, Atlantic City Mercantile is a very small system (500 people or fewer). Fremont County has 61 active public water systems. Its population served is well below the county average of 433 people per system, and accounts for 0.2% 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 transient non-community water system reports serving 144 people, so Atlantic City Mercantile is about 64% below that figure.
What does “transient non-community water system” mean?
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. Wyoming has 352 active transient non-community water systems, 45% of the state's 775 active systems. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules. 24 Wyoming systems (3.1%) list groundwater under influence of surface water as their primary source.
Who owns and regulates Atlantic City Mercantile?
EPA lists Atlantic City Mercantile as privately owned. 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. 37 of the 61 active systems in Fremont County (61%) are also privately owned.
Does Atlantic City Mercantile have drinking water violations?
Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in June 2023. The violations listed here began between September 2012 and June 2023. By type: 7 monitoring and reporting, 2 required treatment not met, 1 reporting, 1 public notice, recordkeeping or other and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 of them). EPA lists 12 as resolved. 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 |
|---|---|---|---|---|
| 2023-06-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2018-06-13 | Required treatment not metFailure To Address Deficiency · code 45 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2018-01-11 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2017-11-24 | Public notice, recordkeeping or otherSample Siting Plan Errors (RTCR) · code 5A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2015-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-12-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2012-09-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2012-09-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 2012-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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.
Atlantic City Mercantile: frequently asked questions
Who runs Atlantic City Mercantile?
Atlantic City Mercantile (PWSID WY5600432) is a transient non-community water system privately owned. It is regulated by the WY state drinking water program.
How many people does Atlantic City Mercantile serve?
Atlantic City Mercantile reports serving 52 people through 5 service connections in Fremont County, Wyoming.
Where does Atlantic City Mercantile get its water?
EPA SDWIS lists this system's primary water source as groundwater under influence of surface water. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules.
Does Atlantic City Mercantile have any drinking water violations?
Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in June 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 Atlantic City Mercantile'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, 3 are health-based, and the most recent began in June 2023. For current results, consult EPA ECHO, or the WY state drinking water program.
Where can I find Atlantic City Mercantile's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Atlantic City Mercantile is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Fremont County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Riverton, City of | Fremont | 10,330 | Community | Surface water |
| 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 |
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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, “Atlantic City Mercantile, PWSID WY5600432, Wyoming”, https://aquacensus.com/water-systems/wyoming/atlantic-city-mercantile-wy5600432 (data as of October 1, 2026).