States ›Montana ›Big Horn County ›Wyola

Wyola, MT Tap Water Quality 2026

Water quality report for Wyola, MT — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Wyola's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Wyola Water System PWSID: 083090014 Updated: 2026 Q2
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1 violation currently open

Lead is 1.00 ppb, 7% of the action level. PFAS has never been sampled at this system.

D

Wyola earns a D for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 1.00 ppb — 7% of the federal action level
PFAS never sampled at this system
180 violations since 2015, 3 health-based
1 violation currently open
Wyola's lead level vs. all Montana community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 1.00 ppb — 7% of the federal action level
✓ Lower lead than 99% of Montana utilities
Population Served
105
~64 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
1
1 open of 180 since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
7% of EPA action level
1.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 1.00 ppb, 7% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Revised Total Coliform Rule MONITORING FAILURE — — 2026 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2026 Archived
Consumer Confidence Rule OTHER — — 2025 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2025 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2025 Resolved
Nitrate-Nitrite MONITORING AND REPORTING — — 2025 Archived
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2024 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2024 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2024 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2024 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2024 Resolved
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2024 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2024 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2024 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2024 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2024 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2024 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2024 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2024 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2024 Resolved
Consumer Confidence Rule OTHER — — 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
Consumer Confidence Rule OTHER — — 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2023 Resolved
Nitrate-Nitrite MONITORING AND REPORTING — — 2023 Resolved
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2023 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2023 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2023 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2023 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2023 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2023 Resolved
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2023 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2023 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2023 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2023 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2023 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2023 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2023 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2023 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2023 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2023 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2023 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2023 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2023 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2023 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2023 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2023–2025 Archived
Barium MONITORING AND REPORTING — 2 mg/L 2023–2025 Archived
Cadmium MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
Chromium MONITORING AND REPORTING — 0.1 mg/L 2023–2025 Archived
CYANIDE MONITORING AND REPORTING — 0.2 mg/L 2023–2025 Archived
Fluoride MONITORING AND REPORTING — 4.0 mg/L 2023–2025 Archived
Mercury MONITORING AND REPORTING — 0.002 mg/L 2023–2025 Archived
Nickel MONITORING AND REPORTING — — 2023–2025 Archived
Antimony, Total MONITORING AND REPORTING — 0.006 mg/L 2023–2025 Archived
Beryllium, Total MONITORING AND REPORTING — 0.004 mg/L 2023–2025 Archived
Thallium, Total MONITORING AND REPORTING — 0.002 mg/L 2023–2025 Archived
Selenium MONITORING AND REPORTING — 0.05 mg/L 2023–2025 Archived
Endrin MONITORING AND REPORTING — 0.002 mg/L 2023–2025 Archived
BHC-GAMMA MONITORING AND REPORTING — 0.0002 mg/L 2023–2025 Archived
Methoxychlor MONITORING AND REPORTING — 0.04 mg/L 2023–2025 Archived
Toxaphene MONITORING AND REPORTING — 0.003 mg/L 2023–2025 Archived
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2023–2025 Archived
Diquat MONITORING AND REPORTING — 0.02 mg/L 2023–2025 Archived
Endothall MONITORING AND REPORTING — 0.1 mg/L 2023–2025 Archived
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2023–2025 Archived
Di(2-ethylhexyl) adipate MONITORING AND REPORTING — 0.4 mg/L 2023–2025 Archived
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2023–2025 Archived
Simazine MONITORING AND REPORTING — 0.004 mg/L 2023–2025 Archived
Di(2-ethylhexyl) phthalate MONITORING AND REPORTING — 0.006 mg/L 2023–2025 Archived
Picloram MONITORING AND REPORTING — 0.5 mg/L 2023–2025 Archived
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2023–2025 Archived
Hexachlorocyclopentadiene MONITORING AND REPORTING — 0.05 mg/L 2023–2025 Archived
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2023–2025 Archived
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2023–2025 Archived
LASSO MONITORING AND REPORTING — — 2023–2025 Archived
Heptachlor MONITORING AND REPORTING — 0.0004 mg/L 2023–2025 Archived
Heptachlor epoxide MONITORING AND REPORTING — 0.0002 mg/L 2023–2025 Archived
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2023–2025 Archived
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2023–2025 Archived
HEXACHLOROBENZENE MONITORING AND REPORTING — 0.001 mg/L 2023–2025 Archived
Benzo(a)pyrene MONITORING AND REPORTING — 0.0002 mg/L 2023–2025 Archived
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2023–2025 Archived
Total Polychlorinated Biphenyls (PCB) MONITORING AND REPORTING — 0.0005 mg/L 2023–2025 Archived
1,2-DIBROMO-3-CHLOROPROPANE MONITORING AND REPORTING — 0.0002 mg/L 2023–2025 Archived
ETHYLENE DIBROMIDE MONITORING AND REPORTING — 0.00005 mg/L 2023–2025 Archived
Chlordane MONITORING AND REPORTING — 0.002 mg/L 2023–2025 Archived
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2022 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2022–2024 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2022–2024 Resolved
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2021 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2021 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2021 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2021 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2021 Resolved
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2021 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2021 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2021 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2021 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2021 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2021 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2021 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2021 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2021 Resolved
1,2-DIBROMO-3-CHLOROPROPANE MONITORING AND REPORTING — 0.0002 mg/L 2021 Resolved
ETHYLENE DIBROMIDE MONITORING AND REPORTING — 0.00005 mg/L 2021 Resolved
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2021 Resolved
Simazine MONITORING AND REPORTING — 0.004 mg/L 2021 Resolved
Toxaphene MONITORING AND REPORTING — 0.003 mg/L 2021 Resolved
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2021 Resolved
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2021 Resolved
Heptachlor epoxide MONITORING AND REPORTING — 0.0002 mg/L 2021 Resolved
BHC-GAMMA MONITORING AND REPORTING — 0.0002 mg/L 2021 Resolved
Total Polychlorinated Biphenyls (PCB) MONITORING AND REPORTING — 0.0005 mg/L 2021 Resolved
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2021 Resolved
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2021 Resolved
Hexachlorocyclopentadiene MONITORING AND REPORTING — 0.05 mg/L 2021 Resolved
Picloram MONITORING AND REPORTING — 0.5 mg/L 2021 Resolved
Di(2-ethylhexyl) adipate MONITORING AND REPORTING — 0.4 mg/L 2021 Resolved
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2021 Resolved
Methoxychlor MONITORING AND REPORTING — 0.04 mg/L 2021 Resolved
HEXACHLOROBENZENE MONITORING AND REPORTING — 0.001 mg/L 2021 Resolved
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2021 Resolved
Endothall MONITORING AND REPORTING — 0.1 mg/L 2021 Resolved
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2021 Resolved
Benzo(a)pyrene MONITORING AND REPORTING — 0.0002 mg/L 2021 Resolved
Di(2-ethylhexyl) phthalate MONITORING AND REPORTING — 0.006 mg/L 2021 Resolved
Diquat MONITORING AND REPORTING — 0.02 mg/L 2021 Resolved
Chlordane MONITORING AND REPORTING — 0.002 mg/L 2021 Resolved
Heptachlor MONITORING AND REPORTING — 0.0004 mg/L 2021 Resolved
LASSO MONITORING AND REPORTING — — 2021 Resolved
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2021 Resolved
Endrin MONITORING AND REPORTING — 0.002 mg/L 2021 Resolved
Groundwater Rule TREATMENT TECHNIQUE — — 2020 Unaddressed
Lead and Copper Rule MONITORING AND REPORTING — TT 2020 Resolved
Nitrate-Nitrite MONITORING AND REPORTING — — 2020 Resolved
Nitrite MONITORING AND REPORTING — 1 mg/L 2020 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2020 Resolved
Nitrate-Nitrite MONITORING AND REPORTING — — 2020 Resolved
Nitrite MONITORING AND REPORTING — 1 mg/L 2020 Resolved
Nitrate-Nitrite MONITORING AND REPORTING — — 2020 Resolved
Nitrite MONITORING AND REPORTING — 1 mg/L 2020 Resolved
Revised Total Coliform Rule MCL EXCEEDANCE — — 2019 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2019 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2019 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Groundwater Rule TREATMENT TECHNIQUE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Nitrate-Nitrite MONITORING AND REPORTING — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2017–2020 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2017–2020 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

1 violation remains open, out of 180 recorded since 2015 (3 health-based).

About the Main Water System

Utility Wyola Water System
PWSID 083090014
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 105
Service connections 64
Systems serving this area 1
Regulator US EPA (tribal primacy)
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Wyola tap water safe to drink? ▼
No federal limit is exceeded on record. 1 violation(s) remain open. Lead is 1.00 ppb, 7% of the action level.
Does Wyola water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Wyola? ▼
Wyola Water System (PWSID 083090014). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-09-23. Inspectors recorded 2 significant deficiencies.

What Should Wyola Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Follow the open violation
This system has an unresolved violation. Contact the supplier for its corrective-action schedule.

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