No health-based violations on EPA record since 2016.
Serves about 7,685 people (3,240 connections) with groundwater from its own wells, and buys water from Mattapoisett River Valley W.d..
From EPA's record for MA4173000. PurityMap is independent of Mattapoisett Water Department.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from February 2023 to August 2023.
| 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 | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| 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 | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| 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 | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| 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 | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| 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 | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| 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 | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| 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 | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2023-08-07 | UCMR5 Analytical Results: MATTAPOISETT WATER DEPARTMENT (MA4173000) |
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 →Mattapoisett Water Department's phone number on EPA record is 5087584161. Its mailing address is P.O. BOX 474, MATTAPOISETT, MA 02739.
According to EPA's record, Mattapoisett Water Department uses groundwater from its own wells, and buys water from Mattapoisett River Valley W.d..
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Mattapoisett Water Department's latest lead and copper round, which ended in December 2025, was 4 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Mattapoisett Water Department. Its phone number on EPA record is 5087584161. Its mailing address on EPA record is P.O. BOX 474, MATTAPOISETT, MA 02739. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.