Public water system · WY5600291
ActiveDave Johnston Power Plant
At a glance
Dave Johnston Power Plant (PWSID WY5600291) is an active non-transient non-community water system in Converse County, Wyoming. It reports serving 201 people through 3 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in April 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
201
Service connections
3
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Dave Johnston Power Plant compare with other water systems in Converse County?
By EPA's size categories, Dave Johnston Power Plant is a very small system (500 people or fewer). Converse County has 19 active public water systems. Its population served is well below the county average of 756 people per system, and accounts for 1.4% of the 14,359 people reported by systems filed under the county. Across Wyoming, the 775 active systems average 838 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Dave Johnston Power Plant is about half of that figure.
What does “non-transient non-community water system” mean?
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. Wyoming has 91 active non-transient non-community water systems, 12% of the state's 775 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 585 Wyoming systems (75%) list groundwater as their primary source.
Who owns and regulates Dave Johnston Power Plant?
EPA lists Dave Johnston Power Plant 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. 11 of the 19 active systems in Converse County (58%) are also privately owned.
Does Dave Johnston Power Plant have drinking water violations?
Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in April 2022. The violations listed here began between July 2010 and April 2022. By type: 7 contaminant level above the legal limit, 3 required treatment not met and 2 monitoring and reporting. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (7 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 |
|---|---|---|---|---|
| 2022-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2016-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2016-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2015-11-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2015-10-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2015-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2015-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2013-10-01 | Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2011-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2010-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2010-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | 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.
Dave Johnston Power Plant: frequently asked questions
Who runs Dave Johnston Power Plant?
Dave Johnston Power Plant (PWSID WY5600291) is a non-transient non-community water system privately owned. It is regulated by the WY state drinking water program.
How many people does Dave Johnston Power Plant serve?
Dave Johnston Power Plant reports serving 201 people through 3 service connections in Converse County, Wyoming.
Where does Dave Johnston Power Plant get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Dave Johnston Power Plant have any drinking water violations?
Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in April 2022. 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 Dave Johnston Power Plant'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, 10 are health-based, and the most recent began in April 2022. For current results, consult EPA ECHO, or the WY state drinking water program.
Where can I find Dave Johnston Power Plant's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Dave Johnston Power Plant is a non-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 Converse County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Douglas, City of | Converse | 6,400 | Community | Surface water |
| Glenrock, Town of | Converse | 2,466 | Community | Groundwater |
| Wydot-Orin Junction Rest Area | Converse | 1,900 | Transient non-community | Groundwater |
| Navajo Trans Engr Co., LLC (Antelope) | Converse | 550 | Non-transient non-community | Groundwater |
| Broken Wheel Truck Stop | Converse | 540 | Non-transient non-community | Groundwater |
| Lone Tree Village MHP | Converse | 475 | Community | Purchased surface water |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Dave Johnston Power Plant, PWSID WY5600291, Wyoming”, https://aquacensus.com/water-systems/wyoming/dave-johnston-power-plant-wy5600291 (data as of October 1, 2026).