FEBRUARY 17, 2026 UPDATE: As of June 9, 2025, water reports can no longer be filed through this Delta ACP website. This website can only be used to view or download previously filed Delta ACP reports. Diverters who want to file water reports under the Delta ACP must file those reports through the State Water Board's new water reporting system called CalWATRS (https://calwatrs.waterboards.ca.gov/portal/s/). The Delta ACP reporting methodology has been integrated into CalWATRS. The CDWA & SDWA have prepared guidelines and recommendations for filing Statement Number (S0_____) and Water License (A0_____) reports under the Delta ACP through CalWATRS. If you have not already received those guides and would like copies of them, please contact Brett G. Baker at bgb@bgbakerlaw.com or (209) 465-5883.

Measure and report water use

The Delta Alternative Compliance Plan (Delta ACP) application allows diverters to easily measure and report water use under Water Code sections 5104 and 1840 using satellite based ET estimates.

Learn More.

Set your boundaries

Confirm the boundary of your place of use (POU) for each individual water statement number. This boundary will enable the Delta ACP to retrieve evapotranspiration data from OpenET for your POU.

Review your data

The Delta ACP will give you a preview of your evapotranspiration (ET) data that it retrieved from OpenET. OpenET provides data from multiple satellite-driven models that are used to map ET, and provides a single “ensemble ET” value that is calculated from those models for each location and timestep. The OpenET project team includes national and international experts in remote sensing of ET, cloud computing, and web development. If you believe there is an error with the ET data for your POU, please notify us.

Deliver your report

After confirming your boundary and reviewing the ET data, you can complete the rest of your Supplemental Statement of Diversion and Use reports. Most of the fields in the report will be prepopulated with OpenET data and previous report responses. The Delta ACP will send completed reports to the California State Water Resources Control Board.

Manage your water use.

The Delta ACP application allows diverters to easily measure and report water use under Water Code sections 5104 and 1840 using satellite based ET estimates.