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Community Water System · PWS WY5600056

Thermopolis, Town Of

Thermopolis, Wyoming 82443 - drinking water served from surface water sources to 2,775 people, tracked in EPA SDWIS and UCMR5.

2,775
People served
29
EPA violations
2
Health-based
Untested
UCMR5 result

The verdict

EPA records 29 drinking-water violations at Thermopolis, Town Of, 7% of them health-based - below the Wyoming per-system average.

29
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
2,775
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Thermopolis, Town Of

Thermopolis, Town Of is a local-owned community water system that delivers drinking water to 2,775 residents in Thermopolis, Wyoming (Hot Springs County) through 1,630 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 29 total violations for this system , of which 2 (7%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 25 monitoring and reporting violations are on file. The most recent violation on record dates to 2011.

The most frequently cited contaminant at this system is Nitrate, recorded in 4 violations (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%).

Thermopolis, Town Of's 29 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
2,775
Total Violations
29
Health-Based Violations
2
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
1,630
County
Hot Springs
School/Daycare
No
MCL Violations
0
Monitoring Violations
25
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MR 4 1994
Chromium MR 2 1993
Lead and Copper Rule MR 2 2007
Interim Enhanced Surface Water Treatment Rule TT 2 2011
Arsenic MR 1 1982
2,4,5-TP MR 1 1981
Methoxychlor MR 1 1981
Endrin MR 1 1981
Selenium MR 1 1982
Total Haloacetic Acids (HAA5) MR 1 2007
CARBON, TOTAL MR 1 2007
Barium MR 1 1982
Gross Alpha, Excl. Radon and U MR 1 1976
Combined Radium (-226 and -228) MR 1 1976
TTHM MR 1 2007
2,4-D MR 1 1981
Cadmium MR 1 1982
Toxaphene MR 1 1981
Fluoride MR 1 1982
BHC-GAMMA MR 1 1981
Mercury MR 1 1982

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 Thermopolis, Town Of.

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 WY5600056 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
2011 Interim Enhanced Surface Water Treatment Rule TT 2 SDWIS / WY5600056 / 0300
2007 Lead and Copper Rule MR 2 SDWIS / WY5600056 / 5000
2007 Total Haloacetic Acids (HAA5) MR 1 SDWIS / WY5600056 / 2456
2007 CARBON, TOTAL MR 1 SDWIS / WY5600056 / 2920
2007 TTHM MR 1 SDWIS / WY5600056 / 2950
1994 Nitrate MR 4 SDWIS / WY5600056 / 1040
1993 Chromium MR 2 SDWIS / WY5600056 / 1020
1982 Arsenic MR 1 SDWIS / WY5600056 / 1005
1982 Selenium MR 1 SDWIS / WY5600056 / 1045
1982 Barium MR 1 SDWIS / WY5600056 / 1010
1982 Cadmium MR 1 SDWIS / WY5600056 / 1015
1982 Fluoride MR 1 SDWIS / WY5600056 / 1025
1982 Mercury MR 1 SDWIS / WY5600056 / 1035
1981 2,4,5-TP MR 1 SDWIS / WY5600056 / 2110
1981 Methoxychlor MR 1 SDWIS / WY5600056 / 2015

How Thermopolis, Town Of Compares

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

Metric Thermopolis, Town Of Wyoming avg Federal benchmark
Total violations 29 42.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 2 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 2,775 835 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 Thermopolis, Town Of water safe to drink? ▼
Thermopolis, Town Of (PWS ID: WY5600056) has 29 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,775 people using Surface Water sources.
How many people does Thermopolis, Town Of serve? ▼
Thermopolis, Town Of serves 2,775 people in Thermopolis, Wyoming. It is a Local-owned system using Surface Water water sources with 1,630 service connections.
What type of violations does Thermopolis, Town Of have? ▼
Thermopolis, Town Of has 29 total violations: 2 health-based violations (MCL exceedances or treatment failures), 25 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Thermopolis, Town Of water? ▼
No PFAS testing data is available for Thermopolis, Town Of under the EPA's UCMR5 monitoring program.
What water source does Thermopolis, Town Of use? ▼
Thermopolis, Town Of uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
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.