No health-based violations on EPA record since 2016.
Serves about 10,362 people (4,318 connections) with groundwater from its own wells.
From EPA's record for AZ0411136. PurityMap is independent of Epcor.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from March 2025 to September 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 110 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 | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluorooctanoic acid (PFOA) | 19 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluorobutanesulfonic acid (PFBS) | 24 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluorohexanoic acid (PFHxA) | 22 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluorobutanoic acid (PFBA) | 6.7 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluoroheptanoic acid (PFHpA) | 4.6 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluoropentanoic acid (PFPeA) | 40 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| 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 | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| 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 | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| 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 | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| 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 | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| 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 | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-17 to 2025-09-08 | UCMR5 Analytical Results: EPCOR - SAN TAN ANTHEM (AZ0411136) |
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.
No health-based violations on EPA record since 2016. EPA also lists 14 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 2023. 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.