Is West Whittier-Los Nietos Tap Water Safe? 2026 Water Quality Report
Short answer: No measured result is above a legal limit. San Gabriel Valley Water Co.-El Monte serves 240,000 residents.
SAN GABRIEL VALLEY WATER CO.-EL MONTE serves West Whittier-Los Nietos
Your water bill or annual water quality report names your actual supplier.
- Source
- Groundwater
- SAN GABRIEL VALLEY WATER CO.-EL MONTEThis reportCA1910039 · 240,000 served
Also supplies: South El Monte
2 detected results
SAN GABRIEL VALLEY WATER CO.-EL MONTE (EPA PWSID CA1910039) delivers groundwater to 240,000 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.
- Perfluorobutanoic acid (PFBA)EPA UCMR 5 · 2025No federal or state limit; shown for transparency10ng/LDetected · no limit
- Perfluoropentanoic acid (PFPeA)EPA UCMR 5 · 2025No federal or state limit; shown for transparency5.6ng/LDetected · no limit
29 other contaminants tested, none detected
- 11Cl-PF3OUdS
- 4:2 FTS
- 6:2 FTS
- 8:2 FTS
- 9Cl-PF3ONS
- ADONA
- HFPO-DA (GenX)
- NEtFOSAA
- NFDHA
- NMeFOSAA
- PFBS
- PFDA
- PFDoA
- PFEESA
- PFHpA
- PFHpS
- PFHxA
- PFHxS
- PFMBA
- PFMPA
- PFNA
- PFOA
- PFOS
- PFPeS
- PFTA
- PFTrDA
- PFUnA
- Lithium
- Lead (90th percentile)
Coverage by group
31 results on record- PFAS (forever chemicals)2 detected · 27 not detected
- Metals & lead1 not detected
- Disinfection by-productsNot monitored
- Other1 not detected
2health-based violations in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score.
No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.
Health-based violations, last 10 years
Every filing is listed; the Track record score counts at most one per contaminant per year.
- Groundwater Rule
Resolved
- Groundwater RuleTT
to Resolved
- Groundwater RuleTT
to Resolved
Test first, then treat what was found
- 01 · TestTest your own tap
A tap test can confirm levels at your home before you choose treatment.
Certified labHow to test your tap → - 02 · PFASReverse osmosis, or carbon certified for PFAS
PFBA 10 ng/L detected (no federal or state limit) (+1 more PFAS detected)
NSF/ANSI 58 or 53, with PFBA/PFPeA named on the listingTreatment for PFAS →
No certified match for these concerns yet
Each card names which West Whittier-Los Nietos findings its current certification covers, and which it doesn't.
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.
No product in our catalogue has verified certification for these concerns yet.
Frequently asked questions
Is West Whittier-Los Nietos tap water safe to drink?
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For West Whittier-Los Nietos, PFBA 10 ng/L and PFPeA 5.6 ng/L were detected, with no federal or state limit. SAN GABRIEL VALLEY WATER CO.-EL MONTE (PWSID CA1910039) has a Purity Score of 98/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.
Who provides tap water in West Whittier-Los Nietos?
SAN GABRIEL VALLEY WATER CO.-EL MONTE (PWS ID CA1910039) is the public water system on record for West Whittier-Los Nietos, California, serving about 240,000 people. Confirm the utility on your water bill before acting on a specific finding.
Where does West Whittier-Los Nietos get its drinking water?
Groundwater (primary source of record in EPA SDWIS).
Are PFAS "forever chemicals" in West Whittier-Los Nietos's water?
Yes. In EPA's UCMR 5 testing (2025-02-28 to 2025-08-25), PFBA was detected at 10 ng/L and PFPeA was detected at 5.6 ng/L. They have no federal or state limit, so PurityMap shows them without grading them. No PFAS with a limit was detected.
Is there lead in West Whittier-Los Nietos's tap water?
Lead is not in West Whittier-Los Nietos's current published record. Lead usually enters from a building's own pipes and fixtures, so a certified home test is the way to know yours.
What does the latest West Whittier-Los Nietos water report show?
PurityMap's current record for West Whittier-Los Nietos holds 31 findings: 2 detected with no limit and 29 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.
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Sources and dataAll 31 records and their sourcesEPA UCMR 5 · EPA SDWIS (Lead & Copper Rule)
| Contaminant | Result | Benchmark | 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) |
29 other contaminants tested — none detected
| Contaminant | Result | Benchmark | Status | Sampled | Source |
|---|---|---|---|---|---|
| 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) |
| Lead (90th percentile) | Non-Detect (ND) | 15 µg/L federal action level | Not detected above the reporting limit | 2024–2026 monitoring period (still open) | Lead & Copper Rule 90th-percentile: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039) |
| 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 | 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) |
- Result
- 10 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Detected, no limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluoropentanoic acid (PFPeA)
- Result
- 5.6 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Detected, no limit
- Sampled
- 2025-02-28 to 2025-08-25
29 other contaminants tested — none detected
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Result
- < 2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Result
- < 5 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
- Result
- Non-Detect (ND)
- Benchmark
- 15 µg/L federal action level
- Status
- Not detected above the reporting limit
- Sampled
- 2024–2026 monitoring period (still open)
- Result
- < 9 µg/L
- Benchmark
- 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Result
- < 6 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Result
- < 20 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluoro-3-methoxypropanoic acid (PFMPA)
- Result
- < 4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluoro-4-methoxybutanoic acid (PFMBA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluorobutanesulfonic acid (PFBS)
- Result
- < 3 ng/L
- Benchmark
- 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluorododecanoic acid (PFDoA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluoroheptanesulfonic acid (PFHpS)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluoroheptanoic acid (PFHpA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluorohexanesulfonic acid (PFHxS)
- Result
- < 3 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluorohexanoic acid (PFHxA)
- Result
- < 3 ng/L
- Benchmark
- 400,000 ng/L Michigan EGLE state MCL (strictest US state)
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
- Result
- < 4 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluorooctanesulfonic acid (PFOS)
- Result
- < 4 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
- Result
- < 4 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluoropentanesulfonic acid (PFPeS)
- Result
- < 4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluorotetradecanoic acid (PFTA)
- Result
- < 8 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluorotridecanoic acid (PFTrDA)
- Result
- < 7 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Perfluoroundecanoic acid (PFUnA)
- Result
- < 2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2025-02-28 to 2025-08-25
Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.
UCMR5 Analytical Results
UCMR5 Analytical Results: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: SAN GABRIEL VALLEY WATER CO.-EL MONTE (CA1910039)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Something off with your water's smell, color or taste?
Start with the hot-or-cold tap check. Where San Gabriel Valley Water Co.-El Monte reported something related, it's shown below.
- Rotten-egg smell
- Cloudy or milky water
- Chlorine smell
- Brown or yellow water
- Metallic taste
Lead at San Gabriel Valley Water Co.-El Monte: not detected (90th percentile, 2024–2026 monitoring period (still open)). Lead has no taste, so a taste neither shows nor rules it out.