Community Water System · PWS KS2014914
St Marys, City Of
St Marys, Kansas 66536 - drinking water served from groundwater sources to 2,781 people, tracked in EPA SDWIS and UCMR5.
- 2,781
- People served
- 36
- EPA violations
- 20
- Health-based
- Untested
- UCMR5 result
The verdict
EPA records 36 drinking-water violations at St Marys, City Of, 56% of them health-based - below the Kansas per-system average.
- 36
- Total EPA violations on record
- 56%
- Health-based (MCL / treatment failure)
- 2,781
- People served by this system
- N/A
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: St Marys, City Of
St Marys, City Of is a local-owned community water system that delivers drinking water to 2,781 residents in St Marys, Kansas (Pottawatomie County) through 981 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 36 total violations for this system , of which 20 (56%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 5 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 Nitrate, recorded in 20 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 Kansas, EPA tracks 957 public water systems serving 2,894,673 people, with 84,344 cumulative violations and 33,424 health-based violations on record. About 99% of systems in the state carry at least one violation, and state-wide the average per system is 88.1 violations. Statewide, 89 of 103 UCMR5-tested systems have reported PFAS detections (86.4%).
St Marys, City Of's 36 violations sit below the Kansas average.
All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 981
- County
- Pottawatomie
- School/Daycare
- No
- MCL Violations
- 20
- Monitoring Violations
- 5
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MCL | 20 | 1997 |
| Lead and Copper Rule | MR | 5 | 2020 |
| Groundwater Rule | Other | 4 | 2018 |
| Consumer Confidence Rule | Other | 1 | 2001 |
| LEAD AND COPPER RULE REVISIONS | RPT | 1 | 2025 |
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 Marys, City Of.
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 KS2014914 on SDWISSource: EPA SDWIS Federal Reports Search
Kansas Drinking Water Authority
Kansas'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 KS regulator via EPA SDWISViolation 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 | LEAD AND COPPER RULE REVISIONS | RPT | 1 | SDWIS / KS2014914 / 5200 |
| 2020 | Lead and Copper Rule | MR | 5 | SDWIS / KS2014914 / 5000 |
| 2018 | Groundwater Rule | Other | 4 | SDWIS / KS2014914 / 0700 |
| 2001 | Consumer Confidence Rule | Other | 1 | SDWIS / KS2014914 / 7000 |
| 1997 | Nitrate | MCL | 20 | SDWIS / KS2014914 / 1040 |
How St Marys, City Of Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | St Marys, City Of | Kansas avg | Federal benchmark |
|---|---|---|---|
| Total violations | 36 | 88.1 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 20 | 34.9 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 86.4% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 2,781 | 3,025 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 957 regulated public water systems in Kansas.
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 Marys, City Of water safe to drink? ▼
How many people does St Marys, City Of serve? ▼
What type of violations does St Marys, City Of have? ▼
Has PFAS been detected in St Marys, City Of water? ▼
What water source does St Marys, City Of use? ▼
Where does this data come from? ▼
Read our methodology - how this data is sourced, computed, and verified.
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.