No open EPA violations as of 2026-09-16.
EPA record checked 2026-10-06
From EPA's record for CA3010004. PurityMap is independent of Mesa Water District.
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.
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: results above a listed reference.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 37.26 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2023-03-14 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| 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 | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| 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 | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| 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 | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| 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 | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| 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 | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| 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: MESA WATER DISTRICT (CA3010004) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-14 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-14 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| 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 | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-14 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-14 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-29 to 2024-08-14 | UCMR5 Analytical Results: MESA WATER DISTRICT (CA3010004) |
0health-based violations in the last 10 years · none open as of 2026-09-16
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 mesawater.org, its phone number on EPA record is 949-207-5468 and its mailing address is 1965 Placentia Ave., COSTA MESA, CA 92707. These details come from the system's EPA record and a check of its website.
Bills, starting service and stopping service are handled by Mesa Water District on its official website, mesawater.org. PurityMap does not take payments.
EPA's records list Mesa Water District as serving Costa Mesa, California. Your water bill names your supplier.
PurityMap's record for Mesa Water District 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 2026-09-16: that is what EPA's record shows for Mesa Water District. The record comes from EPA's SDWIS compliance database.
Mesa Water District is on EPA record as drawing from surface water.
Start with the hot-or-cold tap check. Where Mesa Water District reported something related, it's shown below.
Lead at Mesa Water District: not detected (90th percentile, 2024–2026 monitoring period (still open)). Lead has no taste, so a taste neither shows nor rules it out.