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Non-Transient Non-Community Water System · PWS WY5600291

Dave Johnston Power Plant

Glenrock, Wyoming 82637 - drinking water served from groundwater sources to 165 people, tracked in EPA SDWIS and UCMR5.

165
People served
39
EPA violations
32
Health-based
Untested
UCMR5 result

The verdict

EPA records 39 drinking-water violations at Dave Johnston Power Plant, 82% of them health-based - below the Wyoming per-system average.

39
Total EPA violations on record
82%
Health-based (MCL / treatment failure)
165
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Dave Johnston Power Plant

Dave Johnston Power Plant is a private-owned non-transient non-community water system that delivers drinking water to 165 residents in Glenrock, Wyoming (Converse County) through 3 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 39 total violations for this system , of which 32 (82%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 7 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is TTHM, recorded in 18 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Wyoming, EPA tracks 766 public water systems serving 639,288 people, with 32,465 cumulative violations and 4,023 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 42.4 violations. Statewide, 18 of 33 UCMR5-tested systems have reported PFAS detections (54.5%).

Dave Johnston Power Plant's 39 violations sit below the Wyoming average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
165
Total Violations
39
Health-Based Violations
32
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
3
County
Converse
School/Daycare
No
MCL Violations
23
Monitoring Violations
7
Treatment Tech Violations
9

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 18 2016
Long Term 2 Enhanced Surface Water Treatment Rule TT 6 2015
Total Haloacetic Acids (HAA5) MCL 5 2005
Interim Enhanced Surface Water Treatment Rule TT 3 2013
Coliform (TCR) MR 3 1993
Interim Enhanced Surface Water Treatment Rule MR 2 2015
Nitrate MR 1 1993
Chlorine MR 1 2022

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Dave Johnston Power Plant.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID WY5600291 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Wyoming Drinking Water Authority

Wyoming's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find WY regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2022 Chlorine MR 1 SDWIS / WY5600291 / 0999
2016 TTHM MCL 18 SDWIS / WY5600291 / 2950
2015 Long Term 2 Enhanced Surface Water Treatment Rule TT 6 SDWIS / WY5600291 / 0800
2015 Interim Enhanced Surface Water Treatment Rule MR 2 SDWIS / WY5600291 / 0300
2013 Interim Enhanced Surface Water Treatment Rule TT 3 SDWIS / WY5600291 / 0300
2005 Total Haloacetic Acids (HAA5) MCL 5 SDWIS / WY5600291 / 2456
1993 Coliform (TCR) MR 3 SDWIS / WY5600291 / 3100
1993 Nitrate MR 1 SDWIS / WY5600291 / 1040

How Dave Johnston Power Plant Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Dave Johnston Power Plant Wyoming avg Federal benchmark
Total violations 39 42.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 32 5.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 54.5% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 165 835 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 766 regulated public water systems in Wyoming.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Dave Johnston Power Plant water safe to drink? ▼
Dave Johnston Power Plant (PWS ID: WY5600291) has 39 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 165 people using Groundwater sources.
How many people does Dave Johnston Power Plant serve? ▼
Dave Johnston Power Plant serves 165 people in Glenrock, Wyoming. It is a Private-owned system using Groundwater water sources with 3 service connections.
What type of violations does Dave Johnston Power Plant have? ▼
Dave Johnston Power Plant has 39 total violations: 32 health-based violations (MCL exceedances or treatment failures), 7 monitoring/reporting violations, and 9 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Dave Johnston Power Plant water? ▼
No PFAS testing data is available for Dave Johnston Power Plant under the EPA's UCMR5 monitoring program.
What water source does Dave Johnston Power Plant use? ▼
Dave Johnston Power Plant uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.