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Transient Non-Community Water System · PWS MT0001957

Greycliff Rest Area Eastbound

Billings, Montana 59104 - drinking water served from groundwater sources to 2,500 people, tracked in EPA SDWIS and UCMR5.

2,500
People served
119
EPA violations
62
Health-based
Untested
UCMR5 result

The verdict

EPA records 119 drinking-water violations at Greycliff Rest Area Eastbound, 52% of them health-based - below the Montana per-system average.

119
Total EPA violations on record
52%
Health-based (MCL / treatment failure)
2,500
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Greycliff Rest Area Eastbound

Greycliff Rest Area Eastbound is a state-owned transient non-community water system that delivers drinking water to 2,500 residents in Billings, Montana (Sweet Grass County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 119 total violations for this system , of which 62 (52%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 57 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 40 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 Montana, EPA tracks 2,263 public water systems serving 1,112,267 people, with 297,270 cumulative violations and 25,922 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 131.4 violations. Statewide, 28 of 45 UCMR5-tested systems have reported PFAS detections (62.2%).

Greycliff Rest Area Eastbound's 119 violations sit below the Montana 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
2,500
Total Violations
119
Health-Based Violations
62
Water Source
Groundwater

System Details

System Type
Transient Non-Community
Owner Type
State
Connections
1
County
Sweet Grass
School/Daycare
No
MCL Violations
62
Monitoring Violations
57
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 40 2014
Coliform (TCR) MR 28 2014
Revised Total Coliform Rule MCL 19 2024
E. COLI MR 18 2025
Nitrate-Nitrite MR 8 2022
Nitrate MCL 3 1981
Revised Total Coliform Rule MON 3 2018

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 Greycliff Rest Area Eastbound.

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 MT0001957 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Montana Drinking Water Authority

Montana'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 MT 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 E. COLI MR 18 SDWIS / MT0001957 / 3014
2024 Revised Total Coliform Rule MCL 19 SDWIS / MT0001957 / 8000
2022 Nitrate-Nitrite MR 8 SDWIS / MT0001957 / 1038
2018 Revised Total Coliform Rule MON 3 SDWIS / MT0001957 / 8000
2014 Coliform (TCR) MCL 40 SDWIS / MT0001957 / 3100
2014 Coliform (TCR) MR 28 SDWIS / MT0001957 / 3100
1981 Nitrate MCL 3 SDWIS / MT0001957 / 1040

How Greycliff Rest Area Eastbound Compares

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

Metric Greycliff Rest Area Eastbound Montana avg Federal benchmark
Total violations 119 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 62 11.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 62.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 2,500 492 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,263 regulated public water systems in Montana.

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 Greycliff Rest Area Eastbound water safe to drink? ▼
Greycliff Rest Area Eastbound (PWS ID: MT0001957) has 119 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,500 people using Groundwater sources.
How many people does Greycliff Rest Area Eastbound serve? ▼
Greycliff Rest Area Eastbound serves 2,500 people in Billings, Montana. It is a State-owned system using Groundwater water sources with 1 service connections.
What type of violations does Greycliff Rest Area Eastbound have? ▼
Greycliff Rest Area Eastbound has 119 total violations: 62 health-based violations (MCL exceedances or treatment failures), 57 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Greycliff Rest Area Eastbound water? ▼
No PFAS testing data is available for Greycliff Rest Area Eastbound under the EPA's UCMR5 monitoring program.
What water source does Greycliff Rest Area Eastbound use? ▼
Greycliff Rest Area Eastbound uses Groundwater as its primary water source. It is classified as a Transient Non-Community Water System, serving transient populations.
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.