Short answer: No measured result is above a legal limit. California Water Service serves 60,382 residents.
Your water bill or annual water quality report names your actual supplier.
Also supplies: Atherton, Woodside, Portola Valley
CALIFORNIA WATER SERVICE - BEAR GULCH (EPA PWSID CA4110006) delivers surface water to 60,382 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.
0health-based violations in the last 10 years
From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit.
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.
Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
lead 4 µg/L, below the 15 µg/L action level
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
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
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.
When your results arrive, read them here →
Each card names which North Fair Oaks 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.
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For North Fair Oaks, no regulated PFAS were detected in EPA's 2024 testing; the lead 90th-percentile result was 4 µg/L against the 15 µg/L action level. CALIFORNIA WATER SERVICE - BEAR GULCH (PWSID CA4110006) has a Purity Score of 95/100 (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.
CALIFORNIA WATER SERVICE - BEAR GULCH (PWS ID CA4110006) is the public water system on record for North Fair Oaks, California, serving about 60,382 people. Confirm the utility on your water bill before acting on a specific finding.
Surface water (primary source of record in EPA SDWIS).
None of the 29 PFAS in EPA's UCMR 5 testing (2024-01-08 to 2024-10-09) was detected. "Not detected" means below the lab's reporting limit, not proven zero.
CALIFORNIA WATER SERVICE - BEAR GULCH's most recent lead 90th-percentile result (2022–2024) was 4 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
PurityMap's current record for North Fair Oaks holds 31 findings: 1 detected within the reference and 30 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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| Contaminant | Result | Benchmark | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lead (90th percentile) | 4 µg/L | 15 µg/L federal action level | Below the listed reference | 2022–2024 monitoring period | Lead & Copper Rule 90th-percentile: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| 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 | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| 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 | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| 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 | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| 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 | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| 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 | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| 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 | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-01 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-01 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| 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 | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-01 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-01 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-01-08 to 2024-10-09 | UCMR5 Analytical Results: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006) |
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorooctanesulfonic acid (PFOS)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)
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: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: CALIFORNIA WATER SERVICE - BEAR GULCH (CA4110006)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Start with the hot-or-cold tap check. Where California Water Service reported something related, it's shown below.
Lead at California Water Service: 4 µg/L (90th percentile, 2022–2024 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.