No health-based violations on EPA record since 2016.
Serves about 33,975 people (18,424 connections) with surface water from its own intake, and buys water from Regional Water Authority and CTWC.
From EPA's record for CT0608011. PurityMap is independent of CTWC.
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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 2024 to September 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 12 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluorooctanoic acid (PFOA) | 6 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluorohexanesulfonic acid (PFHxS) | 4 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluorobutanesulfonic acid (PFBS) | 5 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 | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluorohexanoic acid (PFHxA) | 4 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluorobutanoic acid (PFBA) | 12 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluoropentanoic acid (PFPeA) | 4 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| 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 | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| 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 | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| 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 | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| 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 | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| 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 | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| 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 | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-21 to 2025-09-22 | UCMR5 Analytical Results: CTWC - SHORELINE REGION-GUILFORD SYSTEM (CT0608011) |
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 →CTWC's phone number on EPA record is 860-664-6125. Its mailing address is 93 West Main Street, CLINTON, CT 06413.
According to EPA's record, CTWC uses surface water from its own intake, and buys water from Regional Water Authority and CTWC.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in CTWC's latest lead and copper round, which ended in December 2026. The federal action level is 15 µg/L.
PurityMap has no verified website for CTWC. Its phone number on EPA record is 860-664-6125. Its mailing address on EPA record is 93 West Main Street, CLINTON, CT 06413. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.