Onalaska Waterworks
Published drinking-water records and contacts for Onalaska Waterworks. System WI6320327. Review sources and dates; not a real-time water assessment.
- System ID
- WI6320327
- State or territory
- WI
- Published population served
- 18000
- System type (source code)
- CWS
Published records and dates
- PFAS / lithium (EPA UCMR 5): 240 — 2023-01-10 – 2023-07-11
- Lead and copper monitoring summaries: 21 — 1992-07-01 – 2023-09-30
- Wisconsin DNR public-system PFAS records: 1717 — 2023-01-10 – 2026-08-18
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
| Substance | Published result | Reporting limit | Sample date | Sampling location |
|---|---|---|---|---|
| 11Cl-PF3OUdS | < 0.005 µg/L | 0.005 µg/L | 2023-07-11 | Well #7 / 7 |
| 4:2 FTS | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #9 / 9 |
| 6:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2023-07-11 | Well #7 / 7 |
| 8:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2023-07-11 | Well #10 / 10 |
| 9Cl-PF3ONS | < 0.002 µg/L | 0.002 µg/L | 2023-07-11 | Well #8 / 8 |
| ADONA | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #10 / 10 |
| HFPO-DA | < 0.005 µg/L | 0.005 µg/L | 2023-07-11 | Well #9 / 9 |
| NEtFOSAA | < 0.005 µg/L | 0.005 µg/L | 2023-07-11 | Well #9 / 9 |
| NFDHA | < 0.02 µg/L | 0.02 µg/L | 2023-07-11 | Well #9 / 9 |
| NMeFOSAA | < 0.006 µg/L | 0.006 µg/L | 2023-07-11 | Well #7 / 7 |
| PFBA | < 0.005 µg/L | 0.005 µg/L | 2023-07-11 | Well #9 / 9 |
| PFBS | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #7 / 7 |
| PFDA | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #10 / 10 |
| PFDoA | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #10 / 10 |
| PFEESA | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #9 / 9 |
| PFHpA | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #7 / 7 |
| PFHpS | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #7 / 7 |
| PFHxA | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #7 / 7 |
| PFHxS | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #8 / 8 |
| PFMBA | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #8 / 8 |
| PFMPA | < 0.004 µg/L | 0.004 µg/L | 2023-07-11 | Well #7 / 7 |
| PFNA | < 0.004 µg/L | 0.004 µg/L | 2023-07-11 | Well #8 / 8 |
| PFOA | < 0.004 µg/L | 0.004 µg/L | 2023-07-11 | Well #9 / 9 |
| PFOS | < 0.004 µg/L | 0.004 µg/L | 2023-07-11 | Well #10 / 10 |
| PFPeA | < 0.003 µg/L | 0.003 µg/L | 2023-07-11 | Well #7 / 7 |
| PFPeS | < 0.004 µg/L | 0.004 µg/L | 2023-07-11 | Well #10 / 10 |
| PFTA | < 0.008 µg/L | 0.008 µg/L | 2023-07-11 | Well #9 / 9 |
| PFTrDA | < 0.007 µg/L | 0.007 µg/L | 2023-07-11 | Well #9 / 9 |
| PFUnA | < 0.002 µg/L | 0.002 µg/L | 2023-07-11 | Well #10 / 10 |
| lithium | < 9 µg/L | 9 µg/L | 2023-07-11 | Well #9 / 9 |
Download all EPA UCMR 5 records (CSV)
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 mg/L | 2023-06-01 – 2023-09-30 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2020-07-01 – 2020-10-31 | 2026Q3 |
| Lead (PB90) | 0.00145 mg/L | 2017-06-01 – 2017-09-30 | 2026Q3 |
| Lead (PB90) | 0.00149 mg/L | 2015-01-01 – 2015-12-31 | 2026Q3 |
| Lead (PB90) | 0.00178 mg/L | 2014-06-01 – 2014-09-30 | 2026Q3 |
| Copper (CU90) | 1.53 mg/L | 2013-06-01 – 2013-09-30 | 2026Q3 |
| Lead (PB90) | 0.00279 mg/L | 2013-06-01 – 2013-09-30 | 2026Q3 |
| Lead (PB90) | 0.00154 mg/L | 2011-06-01 – 2011-09-30 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| PFDOA | < 0.64 ng/L | 2026-08-18 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFHPA | 0.61 Between LOD and LOQ ng/L | 2026-08-18 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFHXA | 1.2 Between LOD and LOQ ng/L | 2026-08-18 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFHXS | 1.1 Between LOD and LOQ ng/L | 2026-08-18 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFNA | < 0.53 ng/L | 2026-08-18 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFOA | 1.5 Between LOD and LOQ ng/L | 2026-08-18 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFOS | 1.7 ng/L | 2026-08-18 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFTA | < 0.55 ng/L | 2026-08-18 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFTrDA | < 0.55 ng/L | 2026-08-18 | Entry Point / Wisconsin DNR public-system PFAS records |
| PFUNA | < 0.53 ng/L | 2026-08-18 | Entry Point / Wisconsin DNR public-system PFAS records |
| 11CL-PF3OUDS | < 0.31 ng/L | 2026-08-18 | Entry Point / Wisconsin DNR public-system PFAS records |
| 9CL-PF3ONS | < 0.48 ng/L | 2026-08-18 | 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
0 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
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.