E. coli above the legal limit in the period starting August 2025.
Serves about 84,000 people (17,123 connections) with groundwater from its own wells.
From EPA's record for AZ0411131. PurityMap is independent of GW Santa Cruz Water Co.
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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 August 2025 | E. coli | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from May 2024 to November 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 263 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 | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| 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 | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| 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 | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| 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 | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| 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 | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| 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 | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| 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 | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-05-09 to 2024-11-07 | UCMR5 Analytical Results: GW SANTA CRUZ WATER CO (AZ0411131) |
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 →GW Santa Cruz Water Co's phone number on EPA record is 480-328-9281. Its mailing address is 22590 N Powers Pkwy, MARICOPA, AZ 85138.
According to EPA's record, GW Santa Cruz Water Co uses groundwater from its own wells.
EPA's record shows 1 health-based violation for GW Santa Cruz Water Co in the 10 years to July 9, 2026. E. coli was above the legal limit in the period starting August 2025. EPA also lists 75 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 GW Santa Cruz Water Co'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 GW Santa Cruz Water Co. Its phone number on EPA record is 480-328-9281. Its mailing address on EPA record is 22590 N Powers Pkwy, MARICOPA, AZ 85138. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.