No open EPA violations as of 2026-10-15.
EPA record checked 2026-10-06
From EPA's record for WI1130224. PurityMap is independent of Madison Water Utility.
Your water bill lists the utility's phone number and website.
Every community water system publishes one each year. Your water bill or the utility's website links to it.
As listed in EPA's records. Your water bill names your supplier.
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31 results are on record. These 5 come first, closest to a legal limit first.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorohexanesulfonic acid (PFHxS) | 7.3 ng/L | 10 ng/L federal MCL (2024) | At or below EPA's 2024 limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Lead (90th percentile) | 1.8 µg/L | 15 µg/L federal action level | Below the listed reference | 2023–2023 monitoring period | Lead & Copper Rule 90th-percentile: MADISON WATER UTILITY (WI1130224) |
| Perfluorobutanoic acid (PFBA) | 46.5 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| 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 | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| 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 | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| 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 | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| 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 | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| 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 | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| 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 | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| 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 | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-10-02 to 2024-10-08 | UCMR5 Analytical Results: MADISON WATER UTILITY (WI1130224) |
1health-based violation in the last 10 years · none open as of 2026-10-15
From EPA SDWIS. Counted once per contaminant per year in the Track record subject score. A violation record is a compliance fact, not a health verdict.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure
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.
Tested your own tap? Read your results →
★ Best available: Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M), the best fit here; nothing in this group is certified yet.
| Pick | Product | Certification | Price | Link |
|---|---|---|---|---|
| ★ Best available | Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M) | Not certified for PFHxS and Perfluorobutanoic acid (PFBA) | $$ | Check price at Aquasana |
| Also good | Aquasana Clean Water Machine Countertop Filter (AQ-CWM2) | Not certified for PFHxS and Perfluorobutanoic acid (PFBA) | $$ | Check price at Aquasana |
| Also good | SmartFlow® Reverse Osmosis | Not certified for PFHxS and Perfluorobutanoic acid (PFBA) | $$$ | Check price at Aquasana |
★ Best choice: HealthShield™, certified for PFHxS.
| Pick | Product | Certification | Price | Link |
|---|---|---|---|---|
| ★ Best choice | HealthShield™ | Certified for PFHxS (NSF/ANSI 53, WQA) | $$$$ | Check price at Aquasana |
| $ Budget pick | iSpring WGB32B-PFKS PFAS & Heavy Metals Whole House FilterUse code REFISPRING at checkout: 10% off your first iSpring order. | Brand lab-tested for PFAS, not independently certified for PFHxS and Perfluorobutanoic acid (PFBA) | $$$ | Check price at iSpring |
Also: lead picks →
PurityMap earns a commission from these links. "Best choice" and "Budget pick" go to certified products first; commission never decides them. Affiliate disclosure.
Lead service lines
Madison Water Utility reported 2 lead service lines to replace in EPA’s inventory (2026Q2). Many utilities replace these lines for free or share the cost. Ask Madison Water Utility whether your home’s line is on its list before you pay anyone.
Local help
Call to be connected with a local plumbing provider about lead service lines, repiping or fixture replacement.
One email when a new sampling round is published or a result moves across its reference.
Follow this water →PurityMap has no verified website for Madison Water Utility. Your water bill lists the ways to pay. PurityMap does not take payments.
EPA's records list Madison Water Utility as serving Madison, Wisconsin. Your water bill names your supplier.
PurityMap's record for Madison Water Utility holds results for 29 PFAS substances. 2 were detected, and none is above a federal legal limit. Each result links to its source in the city report.
No open EPA violations as of 2026-10-15: that is what EPA's record shows for Madison Water Utility. The record comes from EPA's SDWIS compliance database.
Madison Water Utility is on EPA record as drawing from groundwater.
Start with the hot-or-cold tap check. Where Madison Water Utility reported something related, it's shown below.
Lead at Madison Water Utility: 1.8 µg/L (90th percentile, 2023 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.