On March 15, 2019, the San Diego Regional Water Quality Control Board accepted an updated version of the Water Quality Equivalency (WQE) Guidance Document for Region 9. This guidance document is available below. Additionally available resources are the Automated WQE Worksheet, ArcGIS shapefiles, and presentation slides. The WQE Worksheet can be used to assist in related calculations. The shapefile download includes all of the data used in the spatial analyses associated with the WQE document. The presentation slides were those prepared for the public seminar held on April 9, 2018 at the County of San Diego Kearny Mesa Campus.