Where You Live (Environmental Protection Agency). Search by zip code for environmental data from several databases.
Hydrologic Report (Los Angeles County Department of Public Works). Data relative to Los Angeles County for precipitation, evaporation, runoff, erosion control, dam operation, water quality monitoring, conservation and groundwater. Includes some data, such as Precipitation readings, from San Fernando Valley locations.
Water Quality Report for parts of the City of Los Angeles, including a report for the San Fernando Valley.
Current Air Quality Data (South Coast Air Quality Management District). Some reports include data for the east and west San Fernando Valley.
Current Weather Conditions (National Weather Service) for: