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Transient Non-Community Water System · PWS MT0001284

Caseys Corner 9

Miami, Montana 33178 - drinking water served from groundwater sources to 759 people, tracked in EPA SDWIS and UCMR5.

759
People served
131
EPA violations
21
Health-based
Untested
UCMR5 result

The verdict

EPA records 131 drinking-water violations at Caseys Corner 9, 16% of them health-based - below the Montana per-system average.

131
Total EPA violations on record
16%
Health-based (MCL / treatment failure)
759
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Caseys Corner 9

Caseys Corner 9 is a private-owned transient non-community water system that delivers drinking water to 759 residents in Miami, Montana (Gallatin County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 131 total violations for this system , of which 21 (16%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 107 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 Coliform (TCR), recorded in 55 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 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%).

Caseys Corner 9's 131 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
759
Total Violations
131
Health-Based Violations
21
Water Source
Groundwater

System Details

System Type
Transient Non-Community
Owner Type
Private
Connections
1
County
Gallatin
School/Daycare
No
MCL Violations
15
Monitoring Violations
107
Treatment Tech Violations
6

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 55 2013
Revised Total Coliform Rule MON 30 2023
Coliform (TCR) MCL 15 2013
Nitrate-Nitrite MR 15 2022
E. COLI MR 6 2022
Revised Total Coliform Rule TT 6 2023
Nitrate MR 1 1993

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 Caseys Corner 9.

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 MT0001284 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
2023 Revised Total Coliform Rule MON 30 SDWIS / MT0001284 / 8000
2023 Revised Total Coliform Rule TT 6 SDWIS / MT0001284 / 8000
2022 Nitrate-Nitrite MR 15 SDWIS / MT0001284 / 1038
2022 E. COLI MR 6 SDWIS / MT0001284 / 3014
2013 Coliform (TCR) MR 55 SDWIS / MT0001284 / 3100
2013 Coliform (TCR) MCL 15 SDWIS / MT0001284 / 3100
1993 Nitrate MR 1 SDWIS / MT0001284 / 1040

How Caseys Corner 9 Compares

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

Metric Caseys Corner 9 Montana avg Federal benchmark
Total violations 131 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 21 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 759 492 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 Caseys Corner 9 water safe to drink? ▼
Caseys Corner 9 (PWS ID: MT0001284) has 131 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 759 people using Groundwater sources.
How many people does Caseys Corner 9 serve? ▼
Caseys Corner 9 serves 759 people in Miami, Montana. It is a Private-owned system using Groundwater water sources with 1 service connections.
What type of violations does Caseys Corner 9 have? ▼
Caseys Corner 9 has 131 total violations: 21 health-based violations (MCL exceedances or treatment failures), 107 monitoring/reporting violations, and 6 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Caseys Corner 9 water? ▼
No PFAS testing data is available for Caseys Corner 9 under the EPA's UCMR5 monitoring program.
What water source does Caseys Corner 9 use? ▼
Caseys Corner 9 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.