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Community Water System · PWS ID1050024

St Maries City Of

St Maries, Idaho 83861 - drinking water served from surface water sources to 4,173 people, tracked in EPA SDWIS and UCMR5.

4,173
People served
28
EPA violations
8
Health-based
Untested
UCMR5 result

The verdict

EPA records 28 drinking-water violations at St Maries City Of, 29% of them health-based - below the Idaho per-system average.

28
Total EPA violations on record
29%
Health-based (MCL / treatment failure)
4,173
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: St Maries City Of

St Maries City Of is a local-owned community water system that delivers drinking water to 4,173 residents in St Maries, Idaho (Benewah County) through 1,669 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 28 total violations for this system , of which 8 (29%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 19 monitoring and reporting violations are on file. The most recent violation on record dates to 2006.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 6 violations (TT, 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 Idaho, EPA tracks 2,005 public water systems serving 1,743,912 people, with 104,850 cumulative violations and 19,965 health-based violations on record. About 96% of systems in the state carry at least one violation, and state-wide the average per system is 52.3 violations. Statewide, 40 of 60 UCMR5-tested systems have reported PFAS detections (66.7%).

St Maries City Of's 28 violations sit below the Idaho 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
4,173
Total Violations
28
Health-Based Violations
8
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
1,669
County
Benewah
School/Daycare
No
MCL Violations
2
Monitoring Violations
19
Treatment Tech Violations
6

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule TT 6 2005
Nitrate MR 3 2002
Coliform (TCR) MR 3 2006
Total Haloacetic Acids (HAA5) MR 2 2005
TTHM MR 2 2005
Coliform (TCR) MCL 2 2001
Dalapon MR 1 1996
2,4-D MR 1 1996
2,4,5-TP MR 1 1996
Arsenic MR 1 2001
Chlorine MR 1 2006
Dinoseb MR 1 1996
Picloram MR 1 1996
Surface Water Treatment Rule MR 1 2004
Gross Alpha, Excl. Radon and U MR 1 1979

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 St Maries City 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 ID1050024 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Idaho Drinking Water Authority

Idaho'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 ID 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
2006 Coliform (TCR) MR 3 SDWIS / ID1050024 / 3100
2006 Chlorine MR 1 SDWIS / ID1050024 / 0999
2005 Surface Water Treatment Rule TT 6 SDWIS / ID1050024 / 0200
2005 Total Haloacetic Acids (HAA5) MR 2 SDWIS / ID1050024 / 2456
2005 TTHM MR 2 SDWIS / ID1050024 / 2950
2004 Surface Water Treatment Rule MR 1 SDWIS / ID1050024 / 0200
2002 Nitrate MR 3 SDWIS / ID1050024 / 1040
2001 Coliform (TCR) MCL 2 SDWIS / ID1050024 / 3100
2001 Arsenic MR 1 SDWIS / ID1050024 / 1005
1996 Dalapon MR 1 SDWIS / ID1050024 / 2031
1996 2,4-D MR 1 SDWIS / ID1050024 / 2105
1996 2,4,5-TP MR 1 SDWIS / ID1050024 / 2110
1996 Dinoseb MR 1 SDWIS / ID1050024 / 2041
1996 Picloram MR 1 SDWIS / ID1050024 / 2040
1979 Gross Alpha, Excl. Radon and U MR 1 SDWIS / ID1050024 / 4000

How St Maries City Of Compares

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

Metric St Maries City Of Idaho avg Federal benchmark
Total violations 28 52.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 8 10 Indicates a contaminant exceeded a federal MCL
PFAS detection None 66.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 4,173 870 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,005 regulated public water systems in Idaho.

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 St Maries City Of water safe to drink? ▼
St Maries City Of (PWS ID: ID1050024) has 28 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 4,173 people using Surface Water sources.
How many people does St Maries City Of serve? ▼
St Maries City Of serves 4,173 people in St Maries, Idaho. It is a Local-owned system using Surface Water water sources with 1,669 service connections.
What type of violations does St Maries City Of have? ▼
St Maries City Of has 28 total violations: 8 health-based violations (MCL exceedances or treatment failures), 19 monitoring/reporting violations, and 6 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in St Maries City Of water? ▼
No PFAS testing data is available for St Maries City Of under the EPA's UCMR5 monitoring program.
What water source does St Maries City Of use? ▼
St Maries City Of uses Surface Water 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.