Search CAP

Water Quality Guidance

Water Quality Guidance for the Introduction of Non-Project Water into the Central Arizona Project

CAWCD and the United States Bureau of Reclamation are pleased to announce the release of “Water Quality Guidance for the Introduction of Non-Project Water into the Central Arizona Project.” This guidance document includes extensive numeric standards as well as implementation details for parties proposing to use the CAP system to transport non-Colorado River water supplies. The document helps fulfill Article 12.1 of the CAP System Use Agreement between Reclamation and CAWCD, which requires the establishment of “uniform water quality standards.”

Water Quality Guidance Process

The development process for this document included extensive public input. Following are some of the highlights and comments from that process.

A briefing on the draft Guidance Document was held on April 23, 2020. Video and material from the briefing is posted here.  In addition, the following comments were submitted during the public comment period, which closed on June 25, 2020.

Revised Draft Water Quality Guidance Document (10/26/20)

Based on stakeholder comments and additional technical work, CAP and Reclamation revised the draft Water Quality Guidance Document. A clean and redline version of the revised drafts are posted below. 

These revisions were revised at a stakeholder briefing on Nov. 23, 2020. The agenda and presentation from that briefing are posted here.

This initiated a 90-day comment period, which ended Jan. 24, 2020. Comments follow:

Public Comment

Central Arizona Project Logo
Water Quality Guidance Thumbnail Graphic
Final Water Quality Guidance Document adopted by the board on September 4, 2025

System Use Agreement

CAP and the U.S. Bureau of Reclamation, with input from the Arizona Department of Water Resources and the Arizona Water Banking Authority, have worked intensively to refine and unify these key concepts into a comprehensive framework.  Key elements of this framework have been incorporated into a draft “CAP System Use Agreement.”

Alert Icon

This link is taking you away from the CAP website and provides information on an external site that is consistent with the intended purpose of the CAP website. CAP cannot attest to the accuracy of the information provided by this link or any other linked site. CAP is not responsible for the information or links provided by sponsors of the site or any products presented on the site. These links do not represent an endorsement by CAP or its directors or employees of site sponsors or products.

Alert Icon

This link is taking you away from the CAP website and provides information on an external site that is consistent with the intended purpose of the CAP website. CAP cannot attest to the accuracy of the information provided by this link or any other linked site. CAP is not responsible for the information or links provided by sponsors of the site or any products presented on the site. These links do not represent an endorsement by CAP or its directors or employees of site sponsors or products.

Alert Icon

This link is taking you away from the CAP website and provides information on an external site that is consistent with the intended purpose of the CAP website. CAP cannot attest to the accuracy of the information provided by this link or any other linked site. CAP is not responsible for the information or links provided by sponsors of the site or any products presented on the site. These links do not represent an endorsement by CAP or its directors or employees of site sponsors or products.

Alert Icon

This link is taking you away from the CAP website and provides information on an external site that is consistent with the intended purpose of the CAP website. CAP cannot attest to the accuracy of the information provided by this link or any other linked site. CAP is not responsible for the information or links provided by sponsors of the site or any products presented on the site. These links do not represent an endorsement by CAP or its directors or employees of site sponsors or products.