No health-based violations on EPA record since 2016.
Serves about 6,378 people (2,909 connections) with groundwater from its own wells, and buys water from Putnam Water Pollution Control Authority.
From EPA's record for CT0690011. 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 October 2024 to April 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 9.9 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluorooctanesulfonic acid (PFOS) | 6.8 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluorohexanesulfonic acid (PFHxS) | 4 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluorobutanesulfonic acid (PFBS) | 3.3 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 | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| 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 | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| 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 | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| 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 | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| 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 | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| 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 | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| 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 | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-10-08 to 2025-04-07 | UCMR5 Analytical Results: CTWC - CRYSTAL SYSTEM (CT0690011) |
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 860-944-9655. Its mailing address is 93 W Main Street, CLINTON, CT 06413.
According to EPA's record, CTWC uses groundwater from its own wells, and buys water from Putnam Water Pollution Control Authority.
No health-based violations on EPA record since 2016. EPA also lists 4 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in CTWC's latest lead and copper round, which ended in December 2025, was 0.5 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for CTWC. Its phone number on EPA record is 860-944-9655. Its mailing address on EPA record is 93 W Main Street, CLINTON, CT 06413. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.