Windsor Locks, CT · PFAS · forever chemicals
Is There PFAS in Windsor Locks Tap Water?
Windsor Locks, CT: PFOA 8 ng/L, 2× EPA's 4 ng/L limit; PFOS also above. Every PFAS result and filter certifications per compound.
The measurements · EPA UCMR 5
7 of 29 PFAS detected
Each result is read against its own reference. Only PFOA, PFOS and PFHxS have federal limits. PFBA and PFPeA have no federal or state limit and are shown for transparency, not graded.
- PFOAFederal MCLPerfluorooctanoic acid8ng/LAbove its limit · sampled 2024-03-13 to 2025-07-01Evidence
- PFOSFederal MCLPerfluorooctanesulfonic acid6ng/LAbove its limit · sampled 2024-03-13 to 2025-07-01Evidence
- PFHxSFederal MCLPerfluorohexanesulfonic acid3ng/LDetected, below its limit · limit under EPA review · sampled 2024-03-13 to 2025-07-01Evidence
- PFBSEPA health advisoryPerfluorobutanesulfonic acid3ng/LDetected, below its EPA health advisory · sampled 2024-03-13 to 2025-07-01Evidence
- PFHxAState MCL · MichiganPerfluorohexanoic acid3ng/LDetected, below its state limit · sampled 2024-03-13 to 2025-07-01Evidence
- PFBANo limitPerfluorobutanoic acid5ng/L
No federal or state limit: shown for transparency, not graded.
Detected, no limit · sampled 2024-03-13 to 2025-07-01Evidence - PFPeANo limitPerfluoropentanoic acid3ng/L
No federal or state limit: shown for transparency, not graded.
Detected, no limit · sampled 2024-03-13 to 2025-07-01Evidence
All 29 compounds in this record
- PFOAMCL8 ng/L
- PFOSMCL6 ng/L
- PFHxSMCL3 ng/L
- PFNAMCLNot detected
- HFPO-DA (GenX)MCLNot detected
- PFBS3 ng/L
- PFHxA3 ng/L
- PFBA5 ng/L
- PFPeA3 ng/L
- 11Cl-PF3OUdSNot detected
- 4:2 FTSNot detected
- 6:2 FTSNot detected
- 8:2 FTSNot detected
- 9Cl-PF3ONSNot detected
- ADONANot detected
- NEtFOSAANot detected
- NFDHANot detected
- NMeFOSAANot detected
- PFDANot detected
- PFDoANot detected
- PFEESANot detected
- PFHpANot detected
- PFHpSNot detected
- PFMBANot detected
- PFMPANot detected
- PFPeSNot detected
- PFTANot detected
- PFTrDANot detected
- PFUnANot detected
MCL marks the 5 PFAS given a federal limit in EPA's 2024 rule. EPA has proposed rescinding three of those limits; they apply until a final rule.
Results as a table29 results with limit, status, sample date and source
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 8 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluorooctanesulfonic acid (PFOS) | 6 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluorohexanesulfonic acid (PFHxS) | 3 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluorobutanesulfonic acid (PFBS) | 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 | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluorohexanoic acid (PFHxA) | 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluorobutanoic acid (PFBA) | 5 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluoropentanoic acid (PFPeA) | 3 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| 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 | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| 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 | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| 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 | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| 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 | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| 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 | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-13 to 2025-07-01 | UCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) |
How this compares
PFOS across 764 cities with a detected value
Windsor Locks 64 ng/L federal MCL (2024)
3,396 more were below the lab's 4 ng/L reporting limit and aren't plotted, and 34 have no result on record. 66 cities above 25 ng/L are grouped in the last bar. A position here is not a verdict on the water.
Where Windsor Locks sits6 ng/L PFOSLower than 62% of 764 cities with a detected value.
In Connecticut
15of 26 city reports
have a regulated PFAS above the federal limit.
PFAS across Connecticut →What this record covers
- CTWC - NORTHERN REG-WESTERN SYSTEM's water system as a whole, as reported to EPA UCMR 5.
- 29 PFAS compounds, each with its own result.
- Samples taken 2024-03-13 to 2025-07-01.
What is unknown
- The water at your tap. Building plumbing isn't in this record.
- PFAS not listed in the 29 above were not reported in these records.
- Levels since the last sample have not been published.
Treatment capabilities that apply
Test first, then match a certified method.
A tap test can confirm levels at your home before you choose treatment.
Identified concerns
- PFOA · exceeds the limit
- PFOS · exceeds the limit
- PFBS · detected below the limit
- PFHxA · detected below the limit
- PFHxS · detected below the limit
- PFBA · detected, no federal or state limit
- PFPeA · detected, no federal or state limit
- Reverse osmosisOpen the method →
- Activated carbon (GAC)Open the method →
- Anion exchangeOpen the method →
9 products have a current certification naming a PFAS detected here.See PFAS filters, checked compound by compound ↓
Commercial · PFAS filters
Fit for Windsor Locks’s PFAS, compound by compound
Each filter is checked against the 7 PFAS detected here. A ✓ needs a current certification record that names the compound. A PFAS claim on the box is not enough.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.
- ✓Certified for this compound
- ?Claimed or likely, not established
- –No claim on record
Under-Sink Filter
Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200)
Activated Carbon (Claryum)Detected in Windsor Locks2 of 7 certified
- PFOA8 ng/L✓Certified for this compound
- PFOS6 ng/L✓Certified for this compound
- PFBS3 ng/L–No claim on record
- PFHxA3 ng/L–No claim on record
- PFHxS3 ng/L–No claim on record
- PFBA5 ng/L–No claim on record
- PFPeA3 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOS
Certified for PFOA, PFOS; not established for PFBS, PFHxA, PFHxS, PFBA, PFPeA.
Under-Sink Filter
Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)
Activated Carbon (Claryum)Detected in Windsor Locks2 of 7 certified
- PFOA8 ng/L✓Certified for this compound
- PFOS6 ng/L✓Certified for this compound
- PFBS3 ng/L–No claim on record
- PFHxA3 ng/L–No claim on record
- PFHxS3 ng/L–No claim on record
- PFBA5 ng/L–No claim on record
- PFPeA3 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOA, PFOS; not established for PFBS, PFHxA, PFHxS, PFBA, PFPeA.
Countertop System
Aquasana Clean Water Machine Countertop Filter (AQ-CWM2)
Activated Carbon (Claryum)Detected in Windsor Locks2 of 7 certified
- PFOA8 ng/L✓Certified for this compound
- PFOS6 ng/L✓Certified for this compound
- PFBS3 ng/L–No claim on record
- PFHxA3 ng/L–No claim on record
- PFHxS3 ng/L–No claim on record
- PFBA5 ng/L–No claim on record
- PFPeA3 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOA, PFOS; not established for PFBS, PFHxA, PFHxS, PFBA, PFPeA.
Countertop System
Patriot Pure Ultimate Water Filtration System
Gravity pour-through (Nanomesh filter)Detected in Windsor Locks2 of 7 certified
- PFOA8 ng/L✓Certified for this compound
- PFOS6 ng/L✓Certified for this compound
- PFBS3 ng/L–No claim on record
- PFHxA3 ng/L–No claim on record
- PFHxS3 ng/L–No claim on record
- PFBA5 ng/L–No claim on record
- PFPeA3 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOS
Certified for PFOA, PFOS; not established for PFBS, PFHxA, PFHxS, PFBA, PFPeA.
Countertop System
AquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100)
Reverse OsmosisDetected in Windsor Locks2 of 7 certified
- PFOA8 ng/L✓Certified for this compound
- PFOS6 ng/L✓Certified for this compound
- PFBS3 ng/L–No claim on record
- PFHxA3 ng/L–No claim on record
- PFHxS3 ng/L–No claim on record
- PFBA5 ng/L–No claim on record
- PFPeA3 ng/L–No claim on record
CertifiedNSF/ANSI 58NSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOA, PFOS; not established for PFBS, PFHxA, PFHxS, PFBA, PFPeA.
Countertop System
AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)
Reverse OsmosisDetected in Windsor Locks2 of 7 certified
- PFOA8 ng/L✓Certified for this compound
- PFOS6 ng/L✓Certified for this compound
- PFBS3 ng/L–No claim on record
- PFHxA3 ng/L–No claim on record
- PFHxS3 ng/L–No claim on record
- PFBA5 ng/L–No claim on record
- PFPeA3 ng/L–No claim on record
CertifiedNSF/ANSI 58NSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOA, PFOS; not established for PFBS, PFHxA, PFHxS, PFBA, PFPeA.
Under-Sink Filter
Waterdrop G3P600 Tankless Reverse-Osmosis System
Reverse OsmosisDetected in Windsor Locks2 of 7 certified
- PFOA8 ng/L✓Certified for this compound
- PFOS6 ng/L✓Certified for this compound
- PFBS3 ng/L–No claim on record
- PFHxA3 ng/L–No claim on record
- PFHxS3 ng/L–No claim on record
- PFBA5 ng/L–No claim on record
- PFPeA3 ng/L–No claim on record
CertifiedNSF/ANSI 58NSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOA, PFOS; not established for PFBS, PFHxA, PFHxS, PFBA, PFPeA.
Under-Sink Filter
Waterdrop G3P800 Tankless Reverse-Osmosis System
Reverse OsmosisDetected in Windsor Locks2 of 7 certified
- PFOA8 ng/L✓Certified for this compound
- PFOS6 ng/L✓Certified for this compound
- PFBS3 ng/L–No claim on record
- PFHxA3 ng/L–No claim on record
- PFHxS3 ng/L–No claim on record
- PFBA5 ng/L–No claim on record
- PFPeA3 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 58NSF/ANSI 42
Certified for PFOA, PFOS; not established for PFBS, PFHxA, PFHxS, PFBA, PFPeA.
Refrigerator Filter
Whirlpool Filter 3 Refrigerator Water Filter (WHR3RXD1)
Activated CarbonDetected in Windsor Locks2 of 7 certified
- PFOA8 ng/L✓Certified for this compound
- PFOS6 ng/L✓Certified for this compound
- PFBS3 ng/L–No claim on record
- PFHxA3 ng/L–No claim on record
- PFHxS3 ng/L–No claim on record
- PFBA5 ng/L–No claim on record
- PFPeA3 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42NSF/ANSI 401
Certified for PFOA, PFOS; not established for PFBS, PFHxA, PFHxS, PFBA, PFPeA.
- Browse, not a match:
- Brita Elite Water Filter Pitcher
- Clearly Filtered Pitcher (lab-tested, not NSF 53 certified)
- Culligan ZeroWater 10-Cup Pitcher (ZEROP10)
- Frizzlife SP99 Under-Sink Filter
None of these is certified for all 7 compounds detected here. A tap test first tells you which ones reach your glass.
Questions
Frequently asked
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Is there PFAS in Windsor Locks tap water?
In EPA's UCMR 5 testing of CTWC - NORTHERN REG-WESTERN SYSTEM (2024-03-13 to 2025-07-01): PFBA 5 ng/L (no federal or state limit), PFBS 3 ng/L (EPA health advisory 2,000), PFHxA 3 ng/L (state limit 400,000), PFHxS 3 ng/L (limit 10), PFOA 8 ng/L (limit 4), PFOS 6 ng/L (limit 4), PFPeA 3 ng/L (no federal or state limit) and the other 22 PFAS tested not detected. "Not detected" means below the lab's reporting limit, not proven zero.
What are the federal PFAS limits?
EPA's 2024 drinking-water rule set maximum contaminant levels of 4.0 ng/L for PFOA and for PFOS, and 10 ng/L for PFHxS, PFNA and HFPO-DA (GenX). In May 2026 EPA proposed keeping the PFOA and PFOS limits, with the option of until 2031 to comply, and rescinding the other three. Until a final rule, all five limits apply. Results above them today are above the limits in force.
How do I remove PFAS from my tap water?
Reverse-osmosis systems and filters certified to NSF/ANSI 53 or 58 for PFOA/PFOS reduction are the proven options at the tap. Check the certifier's listing (NSF, WQA or IAPMO) for the exact model, and replace cartridges on schedule.
- UCMR5 Analytical ResultsUCMR5 Analytical Results: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011)US EPA · 2026-01-15View source ↗
- State SDWIS Compliance RecordLead & Copper Rule 90th-percentile: CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011)US EPA SDWIS · 2026-07-09View source ↗