No open EPA violations as of 2026-10-15.
EPA record checked 2026-10-06
From EPA's record for CA0110006. PurityMap is independent of City of Hayward.
Every community water system publishes one each year.
Read the report ↗As listed in EPA's records. Your water bill names your supplier.
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32 results are on record. These 5 come first.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Water hardness | 3.5 gpg | Aesthetic, no federal health limit | Within a secondary/aesthetic reference | 2025 | City of Hayward 2025 Consumer Confidence Report (CCR) |
| 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 | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| 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 | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| 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 | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| 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 | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| 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 | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Lead (90th percentile) | Non-Detect (ND) | 15 µg/L federal action level | Not detected above the reporting limit | 2023–2025 monitoring period | Lead & Copper Rule 90th-percentile: CITY OF HAYWARD (CA0110006) |
| 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 | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| 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 | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-04-02 to 2025-12-15 | UCMR5 Analytical Results: CITY OF HAYWARD (CA0110006) |
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 official website is hayward-ca.gov, its phone number on EPA record is 510-583-4701 and its mailing address is 777 B St, HAYWARD, CA 94541-5007. These details come from the system's EPA record and a check of its website.
Bills, starting service and stopping service are handled by City of Hayward on its official website, hayward-ca.gov. PurityMap does not take payments.
EPA's records list City of Hayward as serving Hayward, California. Your water bill names your supplier.
PurityMap's record for City of Hayward 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 Hayward. The record comes from EPA's SDWIS compliance database.
City of Hayward is on EPA record as drawing from surface water.
Start with the hot-or-cold tap check. Where City of Hayward reported something related, it's shown below.
Lead at City of Hayward: not detected (90th percentile, 2023–2025 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.