West Whittier-Los Nietos, CA · PFAS · forever chemicals
Is There PFAS in West Whittier-Los Nietos Tap Water?
West Whittier-Los Nietos, CA: PFBA 10 ng/L detected (no federal or state limit) in 2024 testing. Every PFAS result and filter certifications per compound.
The measurements · EPA UCMR 5
2 of 29 PFAS detected
Each result is read against its own reference. None of the detected compounds has a federal limit. PFBA and PFPeA have no federal or state limit and are shown for transparency, not graded.
- PFBANo limitPerfluorobutanoic acid10ng/L
No federal or state limit: shown for transparency, not graded.
Detected, no limit · sampled 2025-02-28 to 2025-08-25Evidence - PFPeANo limitPerfluoropentanoic acid5.6ng/L
No federal or state limit: shown for transparency, not graded.
Detected, no limit · sampled 2025-02-28 to 2025-08-25Evidence
All 29 compounds in this record
- PFOAMCLNot detected
- PFOSMCLNot detected
- PFHxSMCLNot detected
- PFNAMCLNot detected
- HFPO-DA (GenX)MCLNot detected
- PFBA10 ng/L
- PFPeA5.6 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
- PFHxANot 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 |
|---|---|---|---|---|---|
| Perfluorobutanoic acid (PFBA) | 10 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluoropentanoic acid (PFPeA) | 5.6 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| 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 | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| 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 | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| 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 | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| 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 | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| 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 | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| 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 | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-28 to 2025-08-25 | UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
How this compares
PFOS across 764 cities with a detected value
4 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 West Whittier-Los Nietos sitsNot on the stripWest Whittier-Los Nietos’s PFOS result was below the lab’s reporting limit.
In California
112of 400 city reports
have a regulated PFAS above the federal limit.
PFAS across California →What this record covers
- SAN GABRIEL VALLEY WATER CO.-EL MONTE's water system as a whole, as reported to EPA UCMR 5.
- 29 PFAS compounds, each with its own result.
- Samples taken 2025-02-28 to 2025-08-25.
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
- 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 →
No product in our catalogue has verified certification for these concerns yet.
Questions
Frequently asked
Follow this water
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Is there PFAS in West Whittier-Los Nietos tap water?
In EPA's UCMR 5 testing of SAN GABRIEL VALLEY WATER CO.-EL MONTE (2025-02-28 to 2025-08-25): PFBA 10 ng/L (no federal or state limit), PFPeA 5.6 ng/L (no federal or state limit) and the other 27 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: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039)US EPA · 2026-01-15View source ↗
- State SDWIS Compliance RecordLead & Copper Rule 90th-percentile: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039)US EPA SDWIS · 2026-07-09View source ↗