No open health-based violations on EPA record in the last 10 years.
Serves about 3,469 people (1,567 connections) with groundwater from its own wells.
From EPA's record for WV3305412. PurityMap is independent of Williamstown Water Dept.
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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 December 2020 | Groundwater Rule | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from May 2023 to November 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 32 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluorohexanesulfonic acid (PFHxS) | 31.3 ng/L | 10 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluorobutanesulfonic acid (PFBS) | 9.4 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluorohexanoic acid (PFHxA) | 9.1 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluorobutanoic acid (PFBA) | 6 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluoroheptanoic acid (PFHpA) | 3.9 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluoropentanoic acid (PFPeA) | 3.5 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| 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 | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| 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 | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| 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 | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| 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 | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| 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 | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| 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 | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-16 to 2023-11-14 | UCMR5 Analytical Results: WILLIAMSTOWN WATER DEPT (WV3305412) |
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 →Williamstown Water Dept's phone number on EPA record is 304-375-7761. Its mailing address is 100 WEST 5TH STREET, WILLIAMSTOWN, WV 26187.
According to EPA's record, Williamstown Water Dept uses groundwater from its own wells.
EPA's record shows 1 health-based violation for Williamstown Water Dept in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. EPA also lists 38 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Williamstown Water Dept's latest lead and copper round, which ended in December 2022, was 3.4 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Williamstown Water Dept. Its phone number on EPA record is 304-375-7761. Its mailing address on EPA record is 100 WEST 5TH STREET, WILLIAMSTOWN, WV 26187. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.