No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting January 2017.
Serves about 87,435 people (26,986 connections) with groundwater from its own wells.
From EPA's record for AZ0411128. PurityMap is independent of Epcor.
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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 January 2017 | Nitrate | 12 mg/L | 10 mg/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from July 2024 to January 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 185 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 | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| 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 | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| 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 | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| 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 | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| 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 | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| 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 | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| 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 | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-16 to 2025-01-22 | UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128) |
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 →Epcor's phone number on EPA record is 602-722-4100. Its mailing address is 968 E. Hunt Highway, SAN TAN VALLEY, AZ 85143.
According to EPA's record, Epcor uses groundwater from its own wells.
EPA's record shows 1 health-based violation for Epcor in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The latest legal-limit breach on record was in the period starting January 2017. EPA also lists 51 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 Epcor'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 Epcor. Its phone number on EPA record is 602-722-4100. Its mailing address on EPA record is 968 E. Hunt Highway, SAN TAN VALLEY, AZ 85143. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.