Ontario Waterworks
Published drinking-water records and contacts for Ontario Waterworks. System WI6630259. Review sources and dates; not a real-time water assessment.
- System ID
- WI6630259
- State or territory
- WI
- Published population served
- 554
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 14 — 1993-07-01 – 2023-09-30
- Wisconsin DNR public-system PFAS records: 72 — 2023-04-10 – 2026-09-14
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) | 0.00127 mg/L | 2023-06-01 – 2023-09-30 | 2026Q3 |
| Lead (PB90) | 0.00145 mg/L | 2020-07-01 – 2020-10-31 | 2026Q3 |
| Lead (PB90) | 0.00109 mg/L | 2017-06-01 – 2017-09-30 | 2026Q3 |
| Lead (PB90) | 0.00144 mg/L | 2014-06-01 – 2014-09-30 | 2026Q3 |
| Lead (PB90) | 0.002765 mg/L | 2011-06-01 – 2011-09-30 | 2026Q3 |
| Lead (PB90) | 0.00248 mg/L | 2008-01-01 – 2008-12-31 | 2026Q3 |
| Lead (PB90) | 0.001605 mg/L | 2005-01-01 – 2005-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2002-01-01 – 2002-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| PFBS | < 0.419 ng/L | 2026-09-14 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFHXA | < 0.479 ng/L | 2026-09-14 | Entry Point / Wisconsin DNR public-system PFAS records |
| HFPO-DA | < 0.433 ng/L | 2026-09-14 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFHPA | < 0.433 ng/L | 2026-09-14 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFHXS | < 0.397 ng/L | 2026-09-14 | Entry Point / Wisconsin DNR public-system PFAS records |
| ADONA | < 0.380 ng/L | 2026-09-14 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFNA | < 0.419 ng/L | 2026-09-14 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFOS | < 0.403 ng/L | 2026-09-14 | Entry Point / Wisconsin DNR public-system PFAS records |
| 9CL-PF3ONS | < 0.338 ng/L | 2026-09-14 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFDA | < 0.418 ng/L | 2026-09-14 | Entry Point / Wisconsin DNR public-system PFAS records |
| NMEFOSAA | < 0.457 ng/L | 2026-09-14 | Entry Point / Wisconsin DNR public-system PFAS records |
| NETFOSAA | < 0.486 ng/L | 2026-09-14 | 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
5 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 |
|---|---|---|---|---|
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2025-07-01 – 2025-07-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2025-01-01 – 2025-12-31 | Archived | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2025-01-01 – 2025-12-31 | Archived | No | 2026Q3 |
| Lead and Copper Rule Revisions / LSL Inventory | 2024-10-17 – — | Resolved | Yes | 2026Q3 |
| Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation | 2024-10-17 – — | Unaddressed | 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: 2026-10-17
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.