Unregulated Contaminants

Results of Monitoring Unregulated Contaminants
Drinking water rules require DWS to monitor for certain unregulated contaminants. Testing detected the following unregulated contaminants.

Unregulated Radiological Contaminants
  • Radon - MCL is not yet available
  • Major source: erosion of natural deposits in groundwater aquifers
Unregulated Disinfection Byproducts
  • Bromodichloromethane
  • Bromoform
  • Chloroform
  • Chlorodibromomethane
For all of the above, the MCL is not yet available and the major source is a byproduct of drinking water chlorination.