No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting April 2024.
Serves about 16,590 people (630 connections) with groundwater from its own wells.
From EPA's record for AZ0403702. PurityMap is independent of Grand Canyon National Park.
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6 health-based violations 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 | – | – | Resolved |
| Apr–Jun 2024 | Total trihalomethanes (TTHM) | 0.082 mg/L | 0.080 mg/L | Resolved |
| From July 2022 | Groundwater Rule | – | – | Resolved |
| From June 2022 | Groundwater Rule | – | – | Resolved |
| From March 2022 | Groundwater Rule | – | – | Resolved |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From December 2021 | Groundwater Rule | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, in July 2024.
| Contaminant | Result | Limit | 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 | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| 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 | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| 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 | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| 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 | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| 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 | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| 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 | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-29 | UCMR5 Analytical Results: GRAND CANYON NATIONAL PARK (AZ0403702) |
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 →According to EPA's record, Grand Canyon National Park uses groundwater from its own wells.
EPA's record shows 6 health-based violations for Grand Canyon National Park 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 April 2024. EPA also lists 50 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 Grand Canyon National Park'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 Grand Canyon National Park. Its mailing address on EPA record is PO BOX 129, GRAND CANYON, AZ 86023. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.