Montclair, CA · PFAS · forever chemicals
Is There PFAS in Montclair Tap Water?
Montclair, CA: PFOS 5.6 ng/L, 1.4× EPA's 4 ng/L limit. Every PFAS result and filter certifications per compound.
The measurements · EPA UCMR 5
5 of 29 PFAS detected
Each result is read against its own reference. Only PFOS and PFHxS have federal limits. PFBA and PFPeA have no federal or state limit and are shown for transparency, not graded.
- PFOSFederal MCLPerfluorooctanesulfonic acid5.6ng/LAbove its limit · sampled 2025-03-18 to 2025-12-22Evidence
- PFHxSFederal MCLPerfluorohexanesulfonic acid7.4ng/LDetected, below its limit · limit under EPA review · sampled 2025-03-18 to 2025-12-22Evidence
- PFHxAState MCL · MichiganPerfluorohexanoic acid3.3ng/LDetected, below its state limit · sampled 2025-03-18 to 2025-12-22Evidence
- PFBANo limitPerfluorobutanoic acid11ng/L
No federal or state limit: shown for transparency, not graded.
Detected, no limit · sampled 2025-03-18 to 2025-12-22Evidence - PFPeANo limitPerfluoropentanoic acid3.5ng/L
No federal or state limit: shown for transparency, not graded.
Detected, no limit · sampled 2025-03-18 to 2025-12-22Evidence
All 29 compounds in this record
- PFOAMCLNot detected
- PFOSMCL5.6 ng/L
- PFHxSMCL7.4 ng/L
- PFNAMCLNot detected
- HFPO-DA (GenX)MCLNot detected
- PFHxA3.3 ng/L
- PFBA11 ng/L
- PFPeA3.5 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
- PFBSNot 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 |
|---|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 5.6 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluorohexanesulfonic acid (PFHxS) | 7.4 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluorohexanoic acid (PFHxA) | 3.3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluorobutanoic acid (PFBA) | 11 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluoropentanoic acid (PFPeA) | 3.5 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| 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 | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| 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 | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| 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 | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| 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 | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| 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 | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| 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 | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-18 to 2025-12-22 | UCMR5 Analytical Results: MONTE VISTA WD (CA3610029) |
How this compares
PFOS across 764 cities with a detected value
Montclair 5.64 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 Montclair sits5.6 ng/L PFOSLower than 68% of 764 cities with a detected value.
In California
112of 400 city reports
have a regulated PFAS above the federal limit.
PFAS across California →What this record covers
- MONTE VISTA WD's water system as a whole, as reported to EPA UCMR 5.
- 29 PFAS compounds, each with its own result.
- Samples taken 2025-03-18 to 2025-12-22.
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
- PFOS · exceeds 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 Montclair’s PFAS, compound by compound
Each filter is checked against the 5 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 Montclair1 of 5 certified
- PFOS5.6 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFHxS7.4 ng/L–No claim on record
- PFBA11 ng/L–No claim on record
- PFPeA3.5 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOS
Certified for PFOS; not established for PFHxA, PFHxS, PFBA, PFPeA.
Under-Sink Filter
Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)
Activated Carbon (Claryum)Detected in Montclair1 of 5 certified
- PFOS5.6 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFHxS7.4 ng/L–No claim on record
- PFBA11 ng/L–No claim on record
- PFPeA3.5 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOS; not established for PFHxA, PFHxS, PFBA, PFPeA.
Countertop System
Aquasana Clean Water Machine Countertop Filter (AQ-CWM2)
Activated Carbon (Claryum)Detected in Montclair1 of 5 certified
- PFOS5.6 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFHxS7.4 ng/L–No claim on record
- PFBA11 ng/L–No claim on record
- PFPeA3.5 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOS; not established for PFHxA, PFHxS, PFBA, PFPeA.
Countertop System
Patriot Pure Ultimate Water Filtration System
Gravity pour-through (Nanomesh filter)Detected in Montclair1 of 5 certified
- PFOS5.6 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFHxS7.4 ng/L–No claim on record
- PFBA11 ng/L–No claim on record
- PFPeA3.5 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOS
Certified for PFOS; not established for PFHxA, PFHxS, PFBA, PFPeA.
Countertop System
AquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100)
Reverse OsmosisDetected in Montclair1 of 5 certified
- PFOS5.6 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFHxS7.4 ng/L–No claim on record
- PFBA11 ng/L–No claim on record
- PFPeA3.5 ng/L–No claim on record
CertifiedNSF/ANSI 58NSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOS; not established for PFHxA, PFHxS, PFBA, PFPeA.
Countertop System
AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)
Reverse OsmosisDetected in Montclair1 of 5 certified
- PFOS5.6 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFHxS7.4 ng/L–No claim on record
- PFBA11 ng/L–No claim on record
- PFPeA3.5 ng/L–No claim on record
CertifiedNSF/ANSI 58NSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOS; not established for PFHxA, PFHxS, PFBA, PFPeA.
Under-Sink Filter
Waterdrop G3P600 Tankless Reverse-Osmosis System
Reverse OsmosisDetected in Montclair1 of 5 certified
- PFOS5.6 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFHxS7.4 ng/L–No claim on record
- PFBA11 ng/L–No claim on record
- PFPeA3.5 ng/L–No claim on record
CertifiedNSF/ANSI 58NSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOS; not established for PFHxA, PFHxS, PFBA, PFPeA.
Under-Sink Filter
Waterdrop G3P800 Tankless Reverse-Osmosis System
Reverse OsmosisDetected in Montclair1 of 5 certified
- PFOS5.6 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFHxS7.4 ng/L–No claim on record
- PFBA11 ng/L–No claim on record
- PFPeA3.5 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 58NSF/ANSI 42
Certified for PFOS; not established for PFHxA, PFHxS, PFBA, PFPeA.
Refrigerator Filter
Whirlpool Filter 3 Refrigerator Water Filter (WHR3RXD1)
Activated CarbonDetected in Montclair1 of 5 certified
- PFOS5.6 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFHxS7.4 ng/L–No claim on record
- PFBA11 ng/L–No claim on record
- PFPeA3.5 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42NSF/ANSI 401
Certified for PFOS; not established for 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 5 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 Montclair tap water?
In EPA's UCMR 5 testing of MONTE VISTA WD (2025-03-18 to 2025-12-22): PFBA 11 ng/L (no federal or state limit), PFHxA 3.3 ng/L (state limit 400,000), PFHxS 7.4 ng/L (limit 10), PFOS 5.6 ng/L (limit 4), PFPeA 3.5 ng/L (no federal or state limit) and the other 24 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: MONTE VISTA WD (CA3610029)US EPA · 2026-01-15View source ↗
- State SDWIS Compliance RecordLead & Copper Rule 90th-percentile: MONTE VISTA WD (CA3610029)US EPA SDWIS · 2026-07-09View source ↗