Grand Canyon National Park (GRCA) issues statement o water system standards

GRCA is required to monitor our drinking water for specific contaminants on a regular basis. Results of regular monitoring are an indicator of whether our drinking water meets health standards. During August 2024 and the 2nd quarter of 2025 GRCA did not complete all monitoring or testing for Total Coliform, Chlorine, and Volatile Organic Compounds (VOC), and therefore cannot be sure of the quality of our drinking water during that time.

What should I do?

There is nothing you need to do currently.

The table below lists the contaminants GRCA did not properly test for during the last year; how often GRCA is supposed to sample, and how many samples GRCA is supposed to collect; how many samples GRCA took; when samples should have been taken; and the date on which follow-up samples were (or will be) taken.

The Transcanyon Waterline (TCWL) was not in operation while being repaired during a planned compliance sampling event causing a missed sample. Lab errors created unusable data for the remaining two samples. The VOC sampling was conducted, however an administrative error prevented it from being recorded by the Arizona Department of Environmental Quality (ADEQ). Subsequent sampling was completed for each contaminant.

For more information, please contact Patrick Perry at 970-786-0512 or patrick_perry@nps.gov.

Please share this information with other people who drink this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand or mail.

This notice is being sent to you by GRAND CANYON NATIONAL PARK

State Water System ID#: 0403702

Date distributed: 01/29/2026