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Community Water System · PWS WY5600023

Guernsey, Town Of

Guernsey, Wyoming 82214 - drinking water served from groundwater sources to 1,157 people, tracked in EPA SDWIS and UCMR5.

1,157
People served
121
EPA violations
19
Health-based
Untested
UCMR5 result

The verdict

EPA records 121 drinking-water violations at Guernsey, Town Of, 16% of them health-based - above the Wyoming per-system average.

121
Total EPA violations on record
16%
Health-based (MCL / treatment failure)
1,157
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Guernsey, Town Of

Guernsey, Town Of is a local-owned community water system that delivers drinking water to 1,157 residents in Guernsey, Wyoming (Platte County) through 630 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 121 total violations for this system , of which 19 (16%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 99 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 19 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%).

Guernsey, Town Of's 121 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
1,157
Total Violations
121
Health-Based Violations
19
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
630
County
Platte
School/Daycare
No
MCL Violations
19
Monitoring Violations
99
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 19 2011
Coliform (TCR) MR 6 2003
Nitrate MR 4 2010
BHC-GAMMA MR 2 2008
Toxaphene MR 2 2008
Di(2-ethylhexyl) adipate MR 2 2008
Dinoseb MR 2 2008
Hexachlorocyclopentadiene MR 2 2008
Carbofuran MR 2 2008
LASSO MR 2 2008
Heptachlor MR 2 2008
Pentachlorophenol MR 2 2008
ETHYLENE DIBROMIDE MR 2 2008
Chlordane MR 2 2008
Revised Total Coliform Rule MON 2 2025
Endrin MR 2 2008
Total Polychlorinated Biphenyls (PCB) MR 2 2008
Methoxychlor MR 2 2008
Di(2-ethylhexyl) phthalate MR 2 2008
OXAMYL MR 2 2008
2,4-D MR 2 2008
Atrazine MR 2 2008
Simazine MR 2 2008
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2008
Dalapon MR 2 2008
Benzo(a)pyrene MR 2 2008
2,4,5-TP MR 2 2008
Heptachlor epoxide MR 2 2008
Picloram MR 2 2008
HEXACHLOROBENZENE MR 2 2008

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 Guernsey, 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 WY5600023 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
2025 Revised Total Coliform Rule MON 2 SDWIS / WY5600023 / 8000
2024 Lead and Copper Rule MR 1 SDWIS / WY5600023 / 5000
2019 Asbestos MR 1 SDWIS / WY5600023 / 1094
2011 Coliform (TCR) MCL 19 SDWIS / WY5600023 / 3100
2010 Nitrate MR 4 SDWIS / WY5600023 / 1040
2008 BHC-GAMMA MR 2 SDWIS / WY5600023 / 2010
2008 Toxaphene MR 2 SDWIS / WY5600023 / 2020
2008 Di(2-ethylhexyl) adipate MR 2 SDWIS / WY5600023 / 2035
2008 Dinoseb MR 2 SDWIS / WY5600023 / 2041
2008 Hexachlorocyclopentadiene MR 2 SDWIS / WY5600023 / 2042
2008 Carbofuran MR 2 SDWIS / WY5600023 / 2046
2008 LASSO MR 2 SDWIS / WY5600023 / 2051
2008 Heptachlor MR 2 SDWIS / WY5600023 / 2065
2008 Pentachlorophenol MR 2 SDWIS / WY5600023 / 2326
2008 ETHYLENE DIBROMIDE MR 2 SDWIS / WY5600023 / 2946

How Guernsey, Town Of Compares

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

Metric Guernsey, Town Of Wyoming avg Federal benchmark
Total violations 121 42.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 19 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 1,157 835 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 Guernsey, Town Of water safe to drink? ▼
Guernsey, Town Of (PWS ID: WY5600023) has 121 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,157 people using Groundwater sources.
How many people does Guernsey, Town Of serve? ▼
Guernsey, Town Of serves 1,157 people in Guernsey, Wyoming. It is a Local-owned system using Groundwater water sources with 630 service connections.
What type of violations does Guernsey, Town Of have? ▼
Guernsey, Town Of has 121 total violations: 19 health-based violations (MCL exceedances or treatment failures), 99 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Guernsey, Town Of water? ▼
No PFAS testing data is available for Guernsey, Town Of under the EPA's UCMR5 monitoring program.
What water source does Guernsey, Town Of use? ▼
Guernsey, Town Of 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.