Framework / Assessment California Forests and Rangelands: 2015 Assessment Summary Listing water-bodies under the Clean Water Act, section 303(d) is conducted when these water-bodies are found to be demonstrably impaired by pollutants (e.g., temperature, nutrients, sediment, mercury). The Regional Boards are responsible for listing water-bodies within each region, so comparisons are best made within regions, not among regions across the state.
