| Air Monitoring Network | California Department of Toxic Substance Control | California Office of Environmental Health Hazzard Assessment | Earth 911 |
| Air Quality Initiative | California Energy Commission | California Office of Historic Preservation | Federal Environmental Protection Agency |
| Air Quality Management District Statewide Directory | California Environmental Insider | California Public Utilities Commission | Natural Resources Conservation Service Plants Database |
| California Archaeological Resources | California Environmental Protection Agency | California Soils Information | Santa Cruz County Soils Survey |
| California Coastal Records Project | California Geological Survey | California State Water Information | Scorecard.org |
| California Department of Pesticide Regulation | California Integrated Waste Management Board | California State Water Resources Control Board | USGS California Earthquake Hazards Program |