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Non-Transient Non-Community Water System · PWS MT0004918

Garnet USA

Alder, Montana 59710 - drinking water served from groundwater sources to 45 people, tracked in EPA SDWIS and UCMR5.

45
People served
99
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 99 drinking-water violations at Garnet USA, 3% of them health-based - below the Montana per-system average.

99
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
45
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Garnet USA

Garnet USA is a private-owned non-transient non-community water system that delivers drinking water to 45 residents in Alder, Montana (Madison County) through 3 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 99 total violations for this system , of which 3 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 96 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 Revised Total Coliform Rule, recorded in 21 violations (MON). 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%).

Garnet USA's 99 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
45
Total Violations
99
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
3
County
Madison
School/Daycare
No
MCL Violations
0
Monitoring Violations
96
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Revised Total Coliform Rule MON 21 2023
Groundwater Rule TT 3 2018
Lead and Copper Rule MR 3 2017
Endrin MR 3 2017
BHC-GAMMA MR 3 2017
Methoxychlor MR 3 2017
Toxaphene MR 3 2017
OXAMYL MR 3 2017
Simazine MR 3 2017
Di(2-ethylhexyl) phthalate MR 3 2017
Atrazine MR 3 2017
LASSO MR 3 2017
Heptachlor MR 3 2017
Heptachlor epoxide MR 3 2017
2,4,5-TP MR 3 2017
HEXACHLOROBENZENE MR 3 2017
Pentachlorophenol MR 3 2017
Chlordane MR 3 2017
Benzo(a)pyrene MR 3 2017
Dalapon MR 3 2017
Di(2-ethylhexyl) adipate MR 3 2017
Hexachlorocyclopentadiene MR 3 2017
Dinoseb MR 3 2017
Asbestos MR 3 2020
2,4-D MR 3 2017
Picloram MR 3 2017
Carbofuran MR 3 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 Garnet USA.

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 MT0004918 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 21 SDWIS / MT0004918 / 8000
2020 Asbestos MR 3 SDWIS / MT0004918 / 1094
2018 Groundwater Rule TT 3 SDWIS / MT0004918 / 0700
2017 Lead and Copper Rule MR 3 SDWIS / MT0004918 / 5000
2017 Endrin MR 3 SDWIS / MT0004918 / 2005
2017 BHC-GAMMA MR 3 SDWIS / MT0004918 / 2010
2017 Methoxychlor MR 3 SDWIS / MT0004918 / 2015
2017 Toxaphene MR 3 SDWIS / MT0004918 / 2020
2017 OXAMYL MR 3 SDWIS / MT0004918 / 2036
2017 Simazine MR 3 SDWIS / MT0004918 / 2037
2017 Di(2-ethylhexyl) phthalate MR 3 SDWIS / MT0004918 / 2039
2017 Atrazine MR 3 SDWIS / MT0004918 / 2050
2017 LASSO MR 3 SDWIS / MT0004918 / 2051
2017 Heptachlor MR 3 SDWIS / MT0004918 / 2065
2017 Heptachlor epoxide MR 3 SDWIS / MT0004918 / 2067

How Garnet USA Compares

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

Metric Garnet USA Montana avg Federal benchmark
Total violations 99 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 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 45 492 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 Garnet USA water safe to drink? ▼
Garnet USA (PWS ID: MT0004918) has 99 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 45 people using Groundwater sources.
How many people does Garnet USA serve? ▼
Garnet USA serves 45 people in Alder, Montana. It is a Private-owned system using Groundwater water sources with 3 service connections.
What type of violations does Garnet USA have? ▼
Garnet USA has 99 total violations: 3 health-based violations (MCL exceedances or treatment failures), 96 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Garnet USA water? ▼
No PFAS testing data is available for Garnet USA under the EPA's UCMR5 monitoring program.
What water source does Garnet USA use? ▼
Garnet USA uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.