San Francisco Bay Delta

Water Quality Improvement

A major objective in EPA's work to restore the San Francisco Bay Delta Watershed is to improve water quality by reducing or preventing contamination of rivers and streams, using a watershed approach.

EPA has worked with local partners to reduce the pesticide diazinon levels in the Sacramento and Feather River systems. As a result, levels of diazinon have dropped below water quality criteria on 79 miles of these rivers. Selenium loads have been reduced by two-thirds since 1996 in Salt Slough and Grasslands Marsh through water management improvments and redirecting contaminated flow.