No health-based violations on EPA record since 2016.
Serves about 7,555 people (2,692 connections) with surface water from its own intake.
From EPA's record for MA4065000. PurityMap is independent of Cohasset Water Dept.
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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 March 2025 to September 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 6.7 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluorooctanesulfonic acid (PFOS) | 4.5 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluorohexanoic acid (PFHxA) | 4 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluorobutanoic acid (PFBA) | 7.3 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluoropentanoic acid (PFPeA) | 4.6 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| 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 | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| 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 | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| 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 | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| 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 | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| 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 | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| 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 | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| 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 | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-04 to 2025-09-16 | UCMR5 Analytical Results: COHASSET WATER DEPT (MA4065000) |
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 →Cohasset Water Dept's phone number on EPA record is 7813830057. Its mailing address is 339 KING ST, COHASSET, MA 02025.
According to EPA's record, Cohasset Water Dept uses surface water from its own intake.
No health-based violations on EPA record since 2016. EPA also lists 32 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Cohasset Water Dept's latest lead and copper round, which ended in December 2025, was 2 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Cohasset Water Dept. Its phone number on EPA record is 7813830057. Its mailing address on EPA record is 339 KING ST, COHASSET, MA 02025. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.