Community Water System · PWS WI1130235
Mendota Mental Health Inst
Madison, Wisconsin 53704 - drinking water served from groundwater sources to 2,787 people, tracked in EPA SDWIS and UCMR5.
- 2,787
- People served
- 17
- EPA violations
- 1
- Health-based
- Untested
- UCMR5 result
The verdict
EPA records 17 drinking-water violations at Mendota Mental Health Inst, 6% of them health-based - below the Wisconsin per-system average.
- 17
- Total EPA violations on record
- 6%
- Health-based (MCL / treatment failure)
- 2,787
- People served by this system
- N/A
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: Mendota Mental Health Inst
Mendota Mental Health Inst is a state-owned community water system that delivers drinking water to 2,787 residents in Madison, Wisconsin (Dane County) through 1,032 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 17 total violations for this system , of which 1 (6%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 15 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.
The most frequently cited contaminant at this system is Revised Total Coliform Rule, recorded in 8 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 Wisconsin, EPA tracks 10,988 public water systems serving 5,131,439 people, with 285,161 cumulative violations and 58,688 health-based violations on record. About 72% of systems in the state carry at least one violation, and state-wide the average per system is 26 violations. Statewide, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%).
Mendota Mental Health Inst's 17 violations sit below the Wisconsin 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
- State
- Connections
- 1,032
- County
- Dane
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 15
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | MON | 8 | 2020 |
| Coliform (TCR) | MR | 4 | 2002 |
| Lead and Copper Rule | MR | 3 | 2014 |
| Lead and Copper Rule | TT | 1 | 2012 |
| Public Notice | Other | 1 | 2012 |
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 Mendota Mental Health Inst.
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 WI1130235 on SDWISSource: EPA SDWIS Federal Reports Search
Wisconsin Drinking Water Authority
Wisconsin DNR, Drinking Water and Groundwater is the primacy agency that licenses and inspects Mendota Mental Health Inst under EPA-delegated authority.
Open WI regulator portalViolation 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 |
|---|---|---|---|---|
| 2020 | Revised Total Coliform Rule | MON | 8 | SDWIS / WI1130235 / 8000 |
| 2014 | Lead and Copper Rule | MR | 3 | SDWIS / WI1130235 / 5000 |
| 2012 | Lead and Copper Rule | TT | 1 | SDWIS / WI1130235 / 5000 |
| 2012 | Public Notice | Other | 1 | SDWIS / WI1130235 / 7500 |
| 2002 | Coliform (TCR) | MR | 4 | SDWIS / WI1130235 / 3100 |
How Mendota Mental Health Inst Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | Mendota Mental Health Inst | Wisconsin avg | Federal benchmark |
|---|---|---|---|
| Total violations | 17 | 26 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 1 | 5.3 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 38.6% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 2,787 | 467 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 10,988 regulated public water systems in Wisconsin.
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 Mendota Mental Health Inst water safe to drink? ▼
How many people does Mendota Mental Health Inst serve? ▼
What type of violations does Mendota Mental Health Inst have? ▼
Has PFAS been detected in Mendota Mental Health Inst water? ▼
What water source does Mendota Mental Health Inst 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.