Delafield Water Quality
Wisconsin
According to EPA SDWIS, Delafield, Wisconsin is served by 9 community water systems covering about 1,517 people. The same extract lists 8 health-based violation records, most recently coded 5200 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Delafield, Wisconsin is delivered through 9 EPA-regulated community water systems serving an estimated 1,517 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 8 violation records across the 9 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 3 distinct EPA contaminant codes: LEAD AND COPPER RULE REVISIONS, Revised Total Coliform Rule, Stage 1 Disinfectants and Disinfection Byproducts Rule.
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 |
|---|---|---|---|
| NASHOTAH HOUSE | 350 | 0 | Clean |
| ST JOHNS NORTHWESTERN ACADEMIES | 340 | 3 | Health |
| DELAFIELD WATERWORKS | 300 | 0 | Clean |
| ARBORS | 280 | 2 | Health |
| COUNTRY AIRE APARTMENTS 2 | 90 | 0 | Clean |
| COUNTRY AIRE APARTMENTS 3 | 80 | 0 | Clean |
| SANCTUARY OF DELAFIELD | 27 | 3 | Health |
| WELLS ST STATION 425 WEST | 25 | 0 | Clean |
| WELLS ST STATION 435 EAST | 25 | 0 | Clean |
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 |
|---|---|---|
| ARBORS | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| ARBORS | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| ST JOHNS NORTHWESTERN ACADEMIES | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| SANCTUARY OF DELAFIELD | Revised Total Coliform Rule | 2024-06-01 |
| SANCTUARY OF DELAFIELD | Revised Total Coliform Rule | 2024-06-01 |
| SANCTUARY OF DELAFIELD | Revised Total Coliform Rule | 2024-06-01 |
| ST JOHNS NORTHWESTERN ACADEMIES | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2021-12-02 |
| ST JOHNS NORTHWESTERN ACADEMIES | Stage 1 Disinfectants and Disinfection Byproducts Rule | 2021-12-02 |
What are Delafield's health-based records for?
Delafield's health-based violation records carry 3 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 |
|---|---|---|
| Lead and Copper Rule Revisions | 3 | 2 |
| Revised Total Coliform Rule | 3 | 1 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 2 | 1 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Delafield, Wisconsin? ▼
How many water violations does Delafield have in this EPA extract? ▼
What contaminants were found in Delafield water? ▼
How many water systems serve Delafield? ▼
Where does Delafield get its drinking water? ▼
How does Delafield compare in Wisconsin?
Of the 492 Wisconsin places with at least one community water system on file, Delafield ranks #6 by number of systems (9).
Either side of it: Madison (16), Colfax (9), Pewaukee (9), Black River Falls (7)
About This Data
Figures here are the current EPA SDWIS extract joined to the 9 community water systems whose service area lists Delafield, 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.