Each hydrologic region is divided into several planning subareas, which, in turn, are divided into detailed analysis units. Data collected at the DAU level is aggregated to the PSA level and then to the hydrologic region level. DWR districts have data for each DAU, and specific requests or questions about the DAU data or the aggregations should be directed to the appropriate district. For your convenience, the addresses and phone numbers of the four district offices are listed below, and a map showing district boundaries is shown on the next page.
Northern District 2440 Main Street Redding, CA 96080-2398 (916) 529-7300
Central District 3251 S Street Sacramento, CA 95816-7017 (916) 445-6831
San Joaquin District 3374 East Shields Avenue Fresno, CA 93726-6990 (209) 445-5443
Southern District 770 Fairmount Avenue Glendale, CA 91203-1035 (818) 543-4600