No health-based violations on EPA record since 2016.
Serves about 9,999 people (338 connections) with groundwater from its own wells.
From EPA's record for RI1858430. PurityMap is independent of Block Island Water Company.
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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 June 2024 to December 2024.
| 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 | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| 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 | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| 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 | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| 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 | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| 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 | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| 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 | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| 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 | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-06-18 to 2024-12-17 | UCMR5 Analytical Results: BLOCK ISLAND WATER COMPANY (RI1858430) |
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 →According to EPA's record, Block Island Water Company uses groundwater from its own wells.
No health-based violations on EPA record since 2016. EPA also lists 63 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Block Island Water Company's latest lead and copper round, which ended in December 2023. The federal action level is 15 µg/L.
PurityMap has no verified website for Block Island Water Company. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.