1 open health-based violation on EPA record.
Serves about 6,110 people (1,920 connections) with groundwater from its own wells.
From EPA's record for CA2410003. PurityMap is independent of City of Gustine.
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1 health-based violation in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2024 | Lead and copper rule revisions | – | – | Unaddressed |
EPA required this system to test for 30 unregulated and emerging contaminants, from April 2023 to January 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 39 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 | 2023-04-03 to 2023-10-09 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| 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 | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| 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 | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| 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 | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| 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 | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| 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 | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2023-11-13 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2023-11-13 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| 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 | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2023-11-13 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2023-11-13 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-04-03 to 2024-01-23 | UCMR5 Analytical Results: CITY OF GUSTINE (CA2410003) |
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.
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Follow this water →City of Gustine's phone number on EPA record is 209-854-6471. Its mailing address is 652 FIFTH STREET, GUSTINE, CA 95322.
According to EPA's record, City of Gustine uses groundwater from its own wells.
EPA's record shows 1 health-based violation for City of Gustine in the 10 years to July 9, 2026. EPA's record lists 1 open health-based violation. EPA also lists 2 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in City of Gustine's latest lead and copper round, which ended in December 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for City of Gustine. Its phone number on EPA record is 209-854-6471. Its mailing address on EPA record is 652 FIFTH STREET, GUSTINE, CA 95322. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.