No open EPA violations as of 2026-10-15.
EPA record checked 2026-10-06
From EPA's record for CA4110022. PurityMap is independent of City of Redwood City.
Every community water system publishes one each year. Your water bill or the utility's website links to it.
As listed in EPA's records. Your water bill names your supplier.
Share of each town's residents (2020 Census) inside this system's mapped service area. A town can have more than one supplier, so check your water bill.
A ZIP code is a postal area, not a water service area. Your water bill names your supplier.
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31 results are on record. These 5 come first.
| 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 | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| 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 | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| 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 | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| 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 | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| 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 | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Lead (90th percentile) | Non-Detect (ND) | 15 µg/L federal action level | Not detected above the reporting limit | 2022–2024 monitoring period | Lead & Copper Rule 90th-percentile: CITY OF REDWOOD CITY (CA4110022) |
| 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 | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| 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 | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-08-15 to 2025-06-06 | UCMR5 Analytical Results: CITY OF REDWOOD CITY (CA4110022) |
0health-based violations in the last 10 years · none open as of 2026-10-15
From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit. Meeting a federal limit is a compliance fact, not a health clearance.
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.
Tested your own tap? Read your results →
One email when a new sampling round is published or a result moves across its reference.
Follow this water →Its phone number on EPA record is 650-780-7469 and its mailing address is 1400 BROADWAY STREET, REDWOOD CITY, CA 94063. These details come from the system's EPA record.
PurityMap has no verified website for City of Redwood City. Its mailing address on EPA record is 1400 BROADWAY STREET, REDWOOD CITY, CA 94063. Your water bill lists the ways to pay. PurityMap does not take payments.
EPA's records list City of Redwood City as serving Redwood City, California. Your water bill names your supplier.
PurityMap's record for City of Redwood City holds results for 29 PFAS substances. None was detected, and none is above a federal legal limit. Each result links to its source in the city report.
No open EPA violations as of 2026-10-15: that is what EPA's record shows for City of Redwood City. The record comes from EPA's SDWIS compliance database.
City of Redwood City is on EPA record as drawing from surface water.
Start with the hot-or-cold tap check. Where City of Redwood City reported something related, it's shown below.
Lead at City of Redwood City: not detected (90th percentile, 2022–2024 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.