No open health-based violations on EPA record in the last 10 years.
Serves about 3,682 people (1,363 connections) with groundwater from its own wells.
From EPA's record for WI1140146. PurityMap is independent of Horicon Waterworks.
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1 health-based violation in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From January 2023 | Groundwater Rule | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from March 2025 to September 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-09-29 | UCMR5 Analytical Results: HORICON WATERWORKS (WI1140146) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →According to EPA's record, Horicon Waterworks uses groundwater from its own wells.
EPA's record shows 1 health-based violation for Horicon Waterworks in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. EPA also lists 1 missed or late test or report in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Horicon Waterworks's latest lead and copper round, which ended in September 2023, was 3.2 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Horicon Waterworks. Its mailing address on EPA record is 404 E LAKE ST, HORICON, WI 53032-1260. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.