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Community Water System · PWS WY5600022

Greybull, Town Of

Greybull, Wyoming 82426 - drinking water served from groundwater sources to 3,260 people, tracked in EPA SDWIS and UCMR5.

3,260
People served
93
EPA violations
2
Health-based
Untested
UCMR5 result

The verdict

EPA records 93 drinking-water violations at Greybull, Town Of, 2% of them health-based - above the Wyoming per-system average.

93
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
3,260
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Greybull, Town Of

Greybull, Town Of is a local-owned community water system that delivers drinking water to 3,260 residents in Greybull, Wyoming (Big Horn County) through 1,325 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 93 total violations for this system , of which 2 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 86 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 5 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%).

Greybull, Town Of's 93 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
3,260
Total Violations
93
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,325
County
Big Horn
School/Daycare
No
MCL Violations
2
Monitoring Violations
86
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 5 2000
Gross Alpha, Excl. Radon and U MR 4 2022
Combined Uranium MR 4 2022
Radium-228 MR 4 2022
Radium-226 MR 4 2022
Nitrate MR 4 1996
Endrin MR 2 2017
BHC-GAMMA MR 2 2017
Methoxychlor MR 2 2017
Toxaphene MR 2 2017
Diquat MR 2 2017
Di(2-ethylhexyl) adipate MR 2 2017
Di(2-ethylhexyl) phthalate MR 2 2017
Atrazine MR 2 2017
Heptachlor MR 2 2017
Heptachlor epoxide MR 2 2017
2,4-D MR 2 2017
HEXACHLOROBENZENE MR 2 2017
Benzo(a)pyrene MR 2 2017
Pentachlorophenol MR 2 2017
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2017
Chlordane MR 2 2017
Dalapon MR 2 2017
Endothall MR 2 2017
Picloram MR 2 2017
Dinoseb MR 2 2017
Hexachlorocyclopentadiene MR 2 2017
Carbofuran MR 2 2017
2,4,5-TP MR 2 2017
ETHYLENE DIBROMIDE MR 2 2017

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 Greybull, 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 WY5600022 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
2024 Nitrate-Nitrite MR 1 SDWIS / WY5600022 / 1038
2022 Gross Alpha, Excl. Radon and U MR 4 SDWIS / WY5600022 / 4000
2022 Combined Uranium MR 4 SDWIS / WY5600022 / 4006
2022 Radium-228 MR 4 SDWIS / WY5600022 / 4030
2022 Radium-226 MR 4 SDWIS / WY5600022 / 4020
2022 Combined Radium (-226 and -228) MR 2 SDWIS / WY5600022 / 4010
2018 Total Haloacetic Acids (HAA5) MR 1 SDWIS / WY5600022 / 2456
2018 TTHM MR 1 SDWIS / WY5600022 / 2950
2017 Endrin MR 2 SDWIS / WY5600022 / 2005
2017 BHC-GAMMA MR 2 SDWIS / WY5600022 / 2010
2017 Methoxychlor MR 2 SDWIS / WY5600022 / 2015
2017 Toxaphene MR 2 SDWIS / WY5600022 / 2020
2017 Diquat MR 2 SDWIS / WY5600022 / 2032
2017 Di(2-ethylhexyl) adipate MR 2 SDWIS / WY5600022 / 2035
2017 Di(2-ethylhexyl) phthalate MR 2 SDWIS / WY5600022 / 2039

How Greybull, Town Of Compares

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

Metric Greybull, Town Of Wyoming avg Federal benchmark
Total violations 93 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 3,260 835 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 Greybull, Town Of water safe to drink? ▼
Greybull, Town Of (PWS ID: WY5600022) has 93 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,260 people using Groundwater sources.
How many people does Greybull, Town Of serve? ▼
Greybull, Town Of serves 3,260 people in Greybull, Wyoming. It is a Local-owned system using Groundwater water sources with 1,325 service connections.
What type of violations does Greybull, Town Of have? ▼
Greybull, Town Of has 93 total violations: 2 health-based violations (MCL exceedances or treatment failures), 86 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Greybull, Town Of water? ▼
No PFAS testing data is available for Greybull, Town Of under the EPA's UCMR5 monitoring program.
What water source does Greybull, Town Of use? ▼
Greybull, 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.