NOA Maps & Resources


An Enhanced map (1:100,000 scale) of areas likely to contain naturally occurring asbestos in Placer County. The report and map image is 3.7 megabytes in size and may take some time to download. This map was prepared by the California Geological Survey (CGS) for the District as Special Report 190 which assessed the likelihood of the presence of Naturally Occurring Asbestos (NOA) in various areas of Placer County.

Detailed Maps

Detailed maps have been prepared showing the relative likelihood of the presence of naturally occurring asbestos. These maps are derived from the Enhanced Map prepared by the CGS. Because the scale is increased from the parent map, the area maps provide an increased ability to locate specific points while introducing some additional uncertainty.

Other Maps

  • California Geological Survey's General Location Guide (PDF) for Ultramafic Rocks in California - Areas More Likely to Contain Naturally Occurring Asbestos
  • Maps displaying ultramafic rock and other Placer County geologic formations at 1:250,000 scale:

Additional Resources

The California Air Resources Board (CARB) Asbestos website provides information, educational material, advisories and fact sheets regarding NOA for general public and interested homeowners.

Asbestos Fact Sheets

General asbestos information and information concerning use/exposure from asbestos in construction materials can be found on the U.S. Environmental Protection Agency's website. Information on asbestos exposure and your health is available on the Agency for Toxic Substances and Disease Registry.

Regulations & Fact Sheets

Additional websites with information on asbestos include: