2010 Clean Water Act Section 303(d) and 305(b) Integrated Report — Statewide

Downloadable Geographic Information System (GIS) Files

Disclaimer for 2010 Integrated Report GIS Files
The GIS files for the 2010 Integrated Report (all assessed waters) and 303(d) List of Water Quality Limited Segments (USEPA approved) were created for reporting purposes by the SWRCB and RWQCB. These GIS representations of the areal extent of assessed and 303(d) waters are estimated and should not be considered authoritative for the development of TMDLs (Total Maximum Daily Loads) or other regulatory actions. The TMDL effort may ultimately address more or less area. Mapping the all assessed and 303(d) listed waters is a work in progress and will be updated during each listing cycle to better define the affected areas.