Madison Water Quality
Wisconsin
According to EPA SDWIS, Madison, Wisconsin is served by 16 community water systems covering about 13,826 people. The same extract lists 31 health-based violation records, most recently coded 8000 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Madison, Wisconsin is delivered through 16 EPA-regulated community water systems serving an estimated 13,826 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 31 violation records across the 16 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 4 distinct EPA contaminant codes: Revised Total Coliform Rule, LEAD AND COPPER RULE REVISIONS, Combined Radium (-226 and -228), Lead and Copper Rule. 12 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Wisconsin drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| WAUPUN CORRECTIONAL INST | 3,706 | 18 | Health |
| MENDOTA MENTAL HEALTH INST | 2,787 | 1 | Health |
| FOX LAKE CORRECTIONAL INSTITUTION | 1,850 | 4 | Health |
| SHOREWOOD HILLS WATERWORKS | 1,670 | 0 | Clean |
| KETTLE MORAINE CORRECTIONAL INSTITUTION | 1,544 | 0 | Clean |
| MAPLE BLUFF WATERWORKS | 1,342 | 0 | Clean |
| LAKE FOREST WATER COOP | 400 | 4 | Health |
| APPLEWOOD HILL | 125 | 0 | Clean |
| GORDON CORRECTIONAL CENTER | 124 | 1 | Health |
| WOODBRIDGE ESTATES | 48 | 0 | Clean |
| PINE RIDGE APTS | 45 | 0 | Clean |
| DELAFIELD LAKES 402 | 40 | 0 | Clean |
| DELAFIELD LAKES 404 | 40 | 0 | Clean |
| DELAFIELD WOODS 411 | 40 | 0 | Clean |
| DELAFIELD WOODS 828 | 40 | 0 | Clean |
| PIRATES COVE MOBILE HOME COMMUNITY | 25 | 3 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| LAKE FOREST WATER COOP | Revised Total Coliform Rule | 2024-11-17 |
| LAKE FOREST WATER COOP | Revised Total Coliform Rule | 2024-11-17 |
| LAKE FOREST WATER COOP | Revised Total Coliform Rule | 2024-11-17 |
| FOX LAKE CORRECTIONAL INSTITUTION | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| LAKE FOREST WATER COOP | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2023-04-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2023-04-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2023-04-01 |
| PIRATES COVE MOBILE HOME COMMUNITY | Revised Total Coliform Rule | 2022-12-06 |
| PIRATES COVE MOBILE HOME COMMUNITY | Revised Total Coliform Rule | 2022-12-06 |
| PIRATES COVE MOBILE HOME COMMUNITY | Revised Total Coliform Rule | 2022-12-06 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-10-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-10-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-10-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-07-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-07-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-07-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-04-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-04-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-04-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-01-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-01-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2020-01-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2019-10-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2019-10-01 |
| WAUPUN CORRECTIONAL INST | Combined Radium (-226 and -228) | 2019-10-01 |
| FOX LAKE CORRECTIONAL INSTITUTION | Lead and Copper Rule | 2012-04-01 |
| MENDOTA MENTAL HEALTH INST | Lead and Copper Rule | 2012-01-01 |
| FOX LAKE CORRECTIONAL INSTITUTION | Lead and Copper Rule | 2009-01-01 |
| FOX LAKE CORRECTIONAL INSTITUTION | Lead and Copper Rule | 2009-01-01 |
| GORDON CORRECTIONAL CENTER | Lead and Copper Rule | 2008-01-01 |
What are Madison's health-based records for?
Madison's health-based violation records carry 4 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Combined Radium (-226 and -228) | 18 | 1 |
| Revised Total Coliform Rule | 6 | 2 |
| Lead and Copper Rule | 5 | 3 |
| Lead and Copper Rule Revisions | 2 | 2 |
TRI Facilities in Madison
| Facility | Total Releases |
|---|---|
| Mge West Campus Cogeneration Facility | 196.6K lbs |
| Berntsen Brass & Aluminum Foundry Inc | 23.3K lbs |
| Danisco USA Inc | 22.4K lbs |
| Tekni-Plex Flexibles LLC | 18.6K lbs |
| Bell Laboratories Inc. | 14.2K lbs |
| Weir Slurry Group Inc | 8.6K lbs |
| Safc Inc. | 2.0K lbs |
| Safety-Kleen Systems Inc. | 1.1K lbs |
| Madison-Kipp Corp | 396 lbs |
| Boumatic LLC | 285 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Madison, Wisconsin? ▼
How many water violations does Madison have in this EPA extract? ▼
What contaminants were found in Madison water? ▼
How many water systems serve Madison? ▼
Where does Madison get its drinking water? ▼
Are there pollution sources near Madison? ▼
How does Madison compare in Wisconsin?
Of the 492 Wisconsin places with at least one community water system on file, Madison ranks #4 by number of systems (16).
Either side of it: Milwaukee (20), Stevens Point (18), Colfax (9), Delafield (9)
About This Data
Figures here are the current EPA SDWIS extract joined to the 16 community water systems whose service area lists Madison, ranked against the 492 Wisconsin places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.