GWRS annual reports The GWRS annual report examines the GWRS operation and performance for the prior calendar year. The report fulfills the GWRS permit requirements set forth by the California Regional Water Quality Control Board, Santa Ana Region. 2022 GWRS Annual Report (PDF) 2021 GWRS Annual Report (PDF) 2020 GWRS Annual Report (PDF) 2019 GWRS Annual Report (PDF) 2018 GWRS Annual Report (PDF) GWRS is a joint collaboration between OCWD and OC San. Tweet