Short answer: No measured result is above a legal limit. Wannacomet Water Company serves 27,703 residents.
This report uses the largest, WANNACOMET WATER COMPANY. Your water bill or annual water quality report names your actual supplier.
Source: EPA SDWIS 2026Q2.
WANNACOMET WATER COMPANY (EPA PWSID MA4197000) delivers groundwater to 27,703 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.
0health-based violations in the last 10 years
From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit.
No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.
Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
lead 2 µg/L, below the 15 µg/L action level (detected below the limit); 168 lead service lines (context, not a tap measurement)
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
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
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.
When your results arrive, read them here →
Each card names which Nantucket findings its current certification covers, and which it doesn't.
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PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Nantucket, no regulated PFAS were detected in EPA's 2024 testing; the lead 90th-percentile result was 2 µg/L against the 15 µg/L action level. WANNACOMET WATER COMPANY (PWSID MA4197000) has a Purity Score of 98/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.
WANNACOMET WATER COMPANY (PWS ID MA4197000) is the public water system on record for Nantucket, Massachusetts, serving about 27,703 people. Confirm the utility on your water bill before acting on a specific finding.
Groundwater (primary source of record in EPA SDWIS).
None of the 29 PFAS in EPA's UCMR 5 testing (2025-01-28 to 2026-05-12) was detected. "Not detected" means below the lab's reporting limit, not proven zero.
WANNACOMET WATER COMPANY's most recent lead 90th-percentile result (2023–2025) was 2 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
PurityMap's current record for Nantucket holds 31 findings: 1 detected within the reference and 30 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.
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| Contaminant | Result | Benchmark | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lead (90th percentile) | 2 µg/L | 15 µg/L federal action level | Below the listed reference | 2023–2025 monitoring period | Lead & Copper Rule 90th-percentile: WANNACOMET WATER COMPANY (MA4197000) |
| Contaminant | Result | Benchmark | 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 | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| 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 | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| 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 | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| 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 | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| 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 | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| 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 | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| 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 | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-28 to 2026-05-12 | UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000) |
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorooctanesulfonic acid (PFOS)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)
Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.
UCMR5 Analytical Results
UCMR5 Analytical Results: WANNACOMET WATER COMPANY (MA4197000)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: WANNACOMET WATER COMPANY (MA4197000)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Start with the hot-or-cold tap check. Where Wannacomet Water Company reported something related, it's shown below.
Lead at Wannacomet Water Company: 2 µg/L (90th percentile, 2023–2025 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.
A ZIP code is a postal area, not a water service area. Your water bill names your supplier.