San Diego River Water Quality Improvement Plan Version Download 651 File Size 75.65 MB File Count 1 Create Date January 15, 2018 Last Updated April 1, 2020 Download Description Attached Files San Diego River (SDR) Water Quality Improvement Plan (WQIP) including the full appendices and regional acceptance letter. This package includes GIS files. FileActionSan Diego River (SDR) Water Quality Improvement Plan (WQIP)Download