PlainWater
States → Wyoming

Community Water System · PWS WY5600209

Hyattville S&i District

Hyattville, Wyoming 82428 - drinking water served from groundwater sources to 66 people, tracked in EPA SDWIS and UCMR5.

66
People served
195
EPA violations
2
Health-based
Untested
UCMR5 result

The verdict

EPA records 195 drinking-water violations at Hyattville S&i District, 1% of them health-based - above the Wyoming per-system average.

195
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
66
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Hyattville S&i District

Hyattville S&i District is a local-owned community water system that delivers drinking water to 66 residents in Hyattville, Wyoming (Big Horn County) through 71 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 195 total violations for this system , of which 2 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 181 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Consumer Confidence Rule, recorded in 8 violations (Other). 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%).

Hyattville S&i District's 195 violations sit above 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
66
Total Violations
195
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
71
County
Big Horn
School/Daycare
No
MCL Violations
2
Monitoring Violations
181
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Consumer Confidence Rule Other 8 2020
1,2-Dichloroethane MR 4 2011
Trichloroethylene MR 4 2011
cis-1,2-Dichloroethylene MR 4 2011
1,2-Dichloropropane MR 4 2011
Ethylbenzene MR 4 2011
o-Dichlorobenzene MR 4 2011
Tetrachloroethylene MR 4 2011
Xylenes, Total MR 4 2011
DICHLOROMETHANE MR 4 2011
1,1,2-Trichloroethane MR 4 2011
Nitrate-Nitrite MR 4 2013
1,1-Dichloroethylene MR 4 2011
trans-1,2-Dichloroethylene MR 4 2011
1,1,1-Trichloroethane MR 4 2011
Carbon tetrachloride MR 4 2011
CHLOROBENZENE MR 4 2011
Benzene MR 4 2011
Styrene MR 4 2011
1,2,4-Trichlorobenzene MR 4 2011
p-Dichlorobenzene MR 4 2011
Toluene MR 4 2011
Vinyl chloride MR 4 2011
Arsenic MR 3 2011
CYANIDE MR 3 2011
Fluoride MR 3 2011
Nickel MR 3 2011
Beryllium, Total MR 3 2011
Barium MR 3 2011
Cadmium MR 3 2011

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 Hyattville S&i District.

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 WY5600209 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
2023 Revised Total Coliform Rule MON 2 SDWIS / WY5600209 / 8000
2020 Consumer Confidence Rule Other 8 SDWIS / WY5600209 / 7000
2016 Lead and Copper Rule MR 1 SDWIS / WY5600209 / 5000
2013 Nitrate-Nitrite MR 4 SDWIS / WY5600209 / 1038
2011 1,2-Dichloroethane MR 4 SDWIS / WY5600209 / 2980
2011 Trichloroethylene MR 4 SDWIS / WY5600209 / 2984
2011 cis-1,2-Dichloroethylene MR 4 SDWIS / WY5600209 / 2380
2011 1,2-Dichloropropane MR 4 SDWIS / WY5600209 / 2983
2011 Ethylbenzene MR 4 SDWIS / WY5600209 / 2992
2011 o-Dichlorobenzene MR 4 SDWIS / WY5600209 / 2968
2011 Tetrachloroethylene MR 4 SDWIS / WY5600209 / 2987
2011 Xylenes, Total MR 4 SDWIS / WY5600209 / 2955
2011 DICHLOROMETHANE MR 4 SDWIS / WY5600209 / 2964
2011 1,1,2-Trichloroethane MR 4 SDWIS / WY5600209 / 2985
2011 1,1-Dichloroethylene MR 4 SDWIS / WY5600209 / 2977

How Hyattville S&i District Compares

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

Metric Hyattville S&i District Wyoming avg Federal benchmark
Total violations 195 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 66 835 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 Hyattville S&i District water safe to drink? ▼
Hyattville S&i District (PWS ID: WY5600209) has 195 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 66 people using Groundwater sources.
How many people does Hyattville S&i District serve? ▼
Hyattville S&i District serves 66 people in Hyattville, Wyoming. It is a Local-owned system using Groundwater water sources with 71 service connections.
What type of violations does Hyattville S&i District have? ▼
Hyattville S&i District has 195 total violations: 2 health-based violations (MCL exceedances or treatment failures), 181 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Hyattville S&i District water? ▼
No PFAS testing data is available for Hyattville S&i District under the EPA's UCMR5 monitoring program.
What water source does Hyattville S&i District use? ▼
Hyattville S&i District uses Groundwater 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.