Williams Bay Waterworks
Published drinking-water records and contacts for Williams Bay Waterworks. System WI2650060. Review sources and dates; not a real-time water assessment.
- System ID
- WI2650060
- State or territory
- WI
- Published population served
- 2601
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 19 — 1993-07-01 – 2026-06-30
- Wisconsin DNR public-system PFAS records: 54 — 2022-06-30 – 2023-08-23
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Published testing results
Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.
“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example
Lead and copper: 90th-percentile summaries
These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | 0.045 mg/L | 2026-01-01 – 2026-06-30 | 2026Q3 |
| Lead (PB90) | 0.016 mg/L | 2025-01-01 – 2025-06-30 | 2026Q3 |
| Lead (PB90) | 0.0065 mg/L | 2024-07-01 – 2024-12-31 | 2026Q3 |
| Lead (PB90) | 0.0023 mg/L | 2020-07-01 – 2020-10-31 | 2026Q3 |
| Lead (PB90) | 0.0072 mg/L | 2019-06-01 – 2019-09-30 | 2026Q3 |
| Lead (PB90) | 0.0074 mg/L | 2018-06-01 – 2018-09-30 | 2026Q3 |
| Lead (PB90) | 0.006 mg/L | 2017-06-01 – 2017-09-30 | 2026Q3 |
| Lead (PB90) | 0.0025 mg/L | 2014-06-01 – 2014-09-30 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| PFDOA | < 0.23 ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFHPA | < 0.44 ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFHXA | < 0.47 ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFHXS | < 0.34 ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFNA | < 0.46 ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFOA | Below a limit; numeric threshold unavailable ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFOS | Below a limit; numeric threshold unavailable ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFTA | < 0.34 ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFTrDA | < 0.43 ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFUNA | < 0.3 ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
| 11CL-PF3OUDS | < 0.31 ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
| 9CL-PF3ONS | < 0.34 ng/L | 2023-08-23 | Entry Point / Wisconsin DNR public-system PFAS records |
State sampling points can include untreated water. Publisher qualifiers and units are retained; consult the full source notes before interpreting a record.
Download state records with source notes (CSV)
Published compliance history
15 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Lead and Copper Rule / Water Quality Parameter M/R | 2026-01-01 – 2026-06-30 | Archived | No | 2026Q3 |
| Lead and Copper Rule / Water Quality Parameter M/R | 2026-01-01 – 2026-06-30 | Archived | No | 2026Q3 |
| Lead and Copper Rule / Initial, Follow-up, or Routine Source Water M/R | 2026-01-01 – — | Unaddressed | No | 2026Q3 |
| Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation | 2025-09-11 – — | Resolved | No | 2026Q3 |
| Lead and Copper Rule / Public Education | 2025-07-01 – — | Resolved | Yes | 2026Q3 |
| Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation | 2025-07-01 – — | Unaddressed | No | 2026Q3 |
| Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation | 2025-07-01 – — | Unaddressed | No | 2026Q3 |
| Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation | 2025-07-01 – — | Unaddressed | No | 2026Q3 |
| Lead and Copper Rule / Initial Tap Sampling for Pb and Cu | 2025-01-01 – — | Unaddressed | No | 2026Q3 |
| Lead and Copper Rule / Water Quality Parameter M/R | 2025-01-01 – 2025-06-30 | Archived | No | 2026Q3 |
| Lead and Copper Rule / Water Quality Parameter M/R | 2025-01-01 – 2025-06-30 | Archived | No | 2026Q3 |
| Consumer Confidence Rule / Consumer Confidence Report Complete Failure to Report | 2021-07-01 – — | Resolved | No | 2026Q3 |
| Consumer Confidence Rule / Consumer Confidence Report Inadequate Reporting | 2021-07-01 – — | Resolved | No | 2026Q3 |
| Consumer Confidence Rule / Consumer Confidence Report Complete Failure to Report | 2020-07-01 – — | Resolved | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2005-04-01 – 2005-06-30 | Archived | No | 2026Q3 |
Source dates and refresh checks
A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.
- EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
- EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
- EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
- Wisconsin DNR public-system PFAS records — last successful check: 2026-10-10
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.