No health-based violations on EPA record since 2016.
Serves about 600 people (256 connections) with surface water from its own intake.
From EPA's record for CA3810001. PurityMap is independent of San Francisco Regional Water System.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from March 2023 to December 2023.
| Contaminant | Result | Limit | 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 | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| 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 | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| 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 | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| 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 | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| 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 | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| 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 | 2023-03-07 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-07 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-07 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| 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 | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-07 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-07 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-17 to 2023-12-04 | UCMR5 Analytical Results: SAN FRANCISCO REGIONAL WATER SYSTEM (CA3810001) |
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
Turnaround: 5 minutes
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
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
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.
Get PurityMap updates about this water system.
Follow this water →San Francisco Regional Water System's phone number on EPA record is 650-652-3100. Its mailing address is 1657 ROLLINS RD, BURLINGAME, CA 94010-2301.
According to EPA's record, San Francisco Regional Water System uses surface water from its own intake.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in San Francisco Regional Water System's latest lead and copper round, which ended in December 2024. The federal action level is 15 µg/L.
PurityMap has no verified website for San Francisco Regional Water System. Its phone number on EPA record is 650-652-3100. Its mailing address on EPA record is 1657 ROLLINS RD, BURLINGAME, CA 94010-2301. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.