Short answer: No measured result is above a legal limit; lithium sits above a screening level, and a past health-based violation (Nitrate) is on record. Epcor serves 87,435 residents.
Your water bill or annual water quality report names your actual supplier.
EPCOR - SAN TAN (EPA PWSID AZ0411128) delivers groundwater to 87,435 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.
1health-based violation in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score.
No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.
Every filing is listed; the Track record score counts at most one per contaminant per year.
Resolved
to Resolved
The records describe the system. A certified lab test shows what reaches your glass.
Lithium 185 µg/L, above the 10.0 µg/L EPA health reference level
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Screening: quick check, not lab-grade
Silver Lake Research
Lead, bacteria, nitrate, copper, iron, chlorine, hardness and pH
What it can't tell you: Each test gives a yes/no or a rough range, not a lab number, and it cannot detect PFAS or arsenic.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
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.
When your results arrive, read them here →
Each card names which San Tan Valley findings its current certification covers, and which it doesn't.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.
No product in our catalogue has verified certification for these concerns yet.
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For San Tan Valley, no regulated PFAS were detected in EPA's 2024 testing; one health-based violation is on record (Nitrate). EPCOR - SAN TAN (PWSID AZ0411128) has a Purity Score of 99/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.
EPCOR - SAN TAN (PWS ID AZ0411128) is the public water system on record for San Tan Valley, Arizona, serving about 87,435 people. Confirm the utility on your water bill before acting on a specific finding.
Groundwater (primary source of record in EPA SDWIS).
None of the 29 PFAS in EPA's UCMR 5 testing (2024-07-16 to 2025-01-22) was detected. "Not detected" means below the lab's reporting limit, not proven zero.
Lead is not in San Tan Valley's current published record. Lead usually enters from a building's own pipes and fixtures, so a certified home test is the way to know yours.
The federal SDWIS record lists a health-based violation for EPCOR - SAN TAN within about the last ten years: Nitrate (2017). The findings above show each one's status.
PurityMap's current record for San Tan Valley holds 32 findings: 2 above a reference and 30 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.
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| Contaminant | Result | Benchmark | 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) |
| Nitrate | 12 MG/L | 10 mg/L | Above the listed reference | 2017 | EPA SDWIS Violations & Enforcement: EPCOR - SAN TAN (AZ0411128) |
| Contaminant | Result | Benchmark | Status | Sampled | Source |
|---|---|---|---|---|---|
| 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) |
| Lead (90th percentile) | Non-Detect (ND) | 15 µg/L federal action level | Not detected above the reporting limit | 2022–2024 monitoring period | Lead & Copper Rule 90th-percentile: 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) |
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorooctanesulfonic acid (PFOS)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)
Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.
UCMR5 Analytical Results
UCMR5 Analytical Results: EPCOR - SAN TAN (AZ0411128)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: EPCOR - SAN TAN (AZ0411128)
US EPA SDWIS
State SDWIS Compliance Record
EPA SDWIS Violations & Enforcement: EPCOR - SAN TAN (AZ0411128)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Start with the hot-or-cold tap check. Where Epcor reported something related, it's shown below.
Lead at Epcor: not detected (90th percentile, 2022–2024 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.
A ZIP code is a postal area, not a water service area. Your water bill names your supplier.