Non-Transient Non-Community Water System · PWS WY5600328
Powder River Coal-Caballo Mine
Gillette, Wyoming 82717 - drinking water served from groundwater sources to 200 people, tracked in EPA SDWIS and UCMR5.
- 200
- People served
- 22
- EPA violations
- 0
- Health-based
- Untested
- UCMR5 result
The verdict
EPA records 22 drinking-water violations at Powder River Coal-Caballo Mine - below the Wyoming per-system average.
- 22
- Total EPA violations on record
- 0%
- Health-based (MCL / treatment failure)
- 200
- People served by this system
- N/A
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: Powder River Coal-Caballo Mine
Powder River Coal-Caballo Mine is a private-owned non-transient non-community water system that delivers drinking water to 200 residents in Gillette, Wyoming (Campbell County) through 8 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 22 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 22 monitoring and reporting violations are on file. The most recent violation on record dates to 2006.
The most frequently cited contaminant at this system is Carbon tetrachloride, recorded in 1 violation (MR). 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%).
Powder River Coal-Caballo Mine's 22 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.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Private
- Connections
- 8
- County
- Campbell
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 22
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Carbon tetrachloride | MR | 1 | 1998 |
| 1,1,1-Trichloroethane | MR | 1 | 1998 |
| Trichloroethylene | MR | 1 | 1998 |
| 1,2-Dichloropropane | MR | 1 | 1998 |
| Styrene | MR | 1 | 1998 |
| trans-1,2-Dichloroethylene | MR | 1 | 1998 |
| Xylenes, Total | MR | 1 | 1998 |
| 1,1,2-Trichloroethane | MR | 1 | 1998 |
| Coliform (TCR) | MR | 1 | 2006 |
| 1,1-Dichloroethylene | MR | 1 | 1998 |
| o-Dichlorobenzene | MR | 1 | 1998 |
| 1,2-Dichloroethane | MR | 1 | 1998 |
| DICHLOROMETHANE | MR | 1 | 1998 |
| p-Dichlorobenzene | MR | 1 | 1998 |
| Benzene | MR | 1 | 1998 |
| Toluene | MR | 1 | 1998 |
| cis-1,2-Dichloroethylene | MR | 1 | 1998 |
| CHLOROBENZENE | MR | 1 | 1998 |
| Tetrachloroethylene | MR | 1 | 1998 |
| Ethylbenzene | MR | 1 | 1998 |
| 1,2,4-Trichlorobenzene | MR | 1 | 1998 |
| Vinyl chloride | MR | 1 | 1998 |
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 Powder River Coal-Caballo Mine.
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 WY5600328 on SDWISSource: EPA SDWIS Federal Reports Search
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 SDWISViolation 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 |
|---|---|---|---|---|
| 2006 | Coliform (TCR) | MR | 1 | SDWIS / WY5600328 / 3100 |
| 1998 | Carbon tetrachloride | MR | 1 | SDWIS / WY5600328 / 2982 |
| 1998 | 1,1,1-Trichloroethane | MR | 1 | SDWIS / WY5600328 / 2981 |
| 1998 | Trichloroethylene | MR | 1 | SDWIS / WY5600328 / 2984 |
| 1998 | 1,2-Dichloropropane | MR | 1 | SDWIS / WY5600328 / 2983 |
| 1998 | Styrene | MR | 1 | SDWIS / WY5600328 / 2996 |
| 1998 | trans-1,2-Dichloroethylene | MR | 1 | SDWIS / WY5600328 / 2979 |
| 1998 | Xylenes, Total | MR | 1 | SDWIS / WY5600328 / 2955 |
| 1998 | 1,1,2-Trichloroethane | MR | 1 | SDWIS / WY5600328 / 2985 |
| 1998 | 1,1-Dichloroethylene | MR | 1 | SDWIS / WY5600328 / 2977 |
| 1998 | o-Dichlorobenzene | MR | 1 | SDWIS / WY5600328 / 2968 |
| 1998 | 1,2-Dichloroethane | MR | 1 | SDWIS / WY5600328 / 2980 |
| 1998 | DICHLOROMETHANE | MR | 1 | SDWIS / WY5600328 / 2964 |
| 1998 | p-Dichlorobenzene | MR | 1 | SDWIS / WY5600328 / 2969 |
| 1998 | Benzene | MR | 1 | SDWIS / WY5600328 / 2990 |
How Powder River Coal-Caballo Mine Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | Powder River Coal-Caballo Mine | Wyoming avg | Federal benchmark |
|---|---|---|---|
| Total violations | 22 | 42.4 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 0 | 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 | 200 | 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 Powder River Coal-Caballo Mine water safe to drink? ▼
How many people does Powder River Coal-Caballo Mine serve? ▼
What type of violations does Powder River Coal-Caballo Mine have? ▼
Has PFAS been detected in Powder River Coal-Caballo Mine water? ▼
What water source does Powder River Coal-Caballo Mine use? ▼
Where does this data come from? ▼
Read our methodology - how this data is sourced, computed, and verified.
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.