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Community Water System · PWS IA9176019

Saint Marys Water Corporation

Saint Charles, Iowa 50240 - drinking water served from surface water sources to 121 people, tracked in EPA SDWIS and UCMR5.

121
People served
125
EPA violations
56
Health-based
Untested
UCMR5 result

The verdict

EPA records 125 drinking-water violations at Saint Marys Water Corporation, 45% of them health-based - above the Iowa per-system average.

125
Total EPA violations on record
45%
Health-based (MCL / treatment failure)
121
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Saint Marys Water Corporation

Saint Marys Water Corporation is a local-owned community water system that delivers drinking water to 121 residents in Saint Charles, Iowa (Warren County) through 69 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 125 total violations for this system , of which 56 (45%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 62 monitoring and reporting violations are on file. The most recent violation on record dates to 2018.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 24 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 Iowa, EPA tracks 1,795 public water systems serving 3,114,444 people, with 138,271 cumulative violations and 27,946 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 77 violations. Statewide, 127 of 152 UCMR5-tested systems have reported PFAS detections (83.6%).

Saint Marys Water Corporation's 125 violations sit above the Iowa 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
121
Total Violations
125
Health-Based Violations
56
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
69
County
Warren
School/Daycare
No
MCL Violations
56
Monitoring Violations
62
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 24 1991
Carbon tetrachloride MR 24 1994
TTHM MCL 20 2008
Nitrate MR 20 1995
Coliform (TCR) MR 13 2000
Nitrate MCL 12 1995
Revised Total Coliform Rule MON 5 2018
Consumer Confidence Rule Other 3 1999

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 Saint Marys Water Corporation.

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 IA9176019 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Iowa Drinking Water Authority

Iowa'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 IA 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
2018 Revised Total Coliform Rule MON 5 SDWIS / IA9176019 / 8000
2008 TTHM MCL 20 SDWIS / IA9176019 / 2950
2000 Coliform (TCR) MR 13 SDWIS / IA9176019 / 3100
1999 Consumer Confidence Rule Other 3 SDWIS / IA9176019 / 7000
1995 Nitrate MR 20 SDWIS / IA9176019 / 1040
1995 Nitrate MCL 12 SDWIS / IA9176019 / 1040
1994 Carbon tetrachloride MR 24 SDWIS / IA9176019 / 2982
1991 Coliform (TCR) MCL 24 SDWIS / IA9176019 / 3100

How Saint Marys Water Corporation Compares

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

Metric Saint Marys Water Corporation Iowa avg Federal benchmark
Total violations 125 77 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 56 15.6 Indicates a contaminant exceeded a federal MCL
PFAS detection None 83.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 121 1,735 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,795 regulated public water systems in Iowa.

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 Saint Marys Water Corporation water safe to drink? ▼
Saint Marys Water Corporation (PWS ID: IA9176019) has 125 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 121 people using Surface Water sources.
How many people does Saint Marys Water Corporation serve? ▼
Saint Marys Water Corporation serves 121 people in Saint Charles, Iowa. It is a Local-owned system using Surface Water water sources with 69 service connections.
What type of violations does Saint Marys Water Corporation have? ▼
Saint Marys Water Corporation has 125 total violations: 56 health-based violations (MCL exceedances or treatment failures), 62 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Saint Marys Water Corporation water? ▼
No PFAS testing data is available for Saint Marys Water Corporation under the EPA's UCMR5 monitoring program.
What water source does Saint Marys Water Corporation use? ▼
Saint Marys Water Corporation 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.