On July 18, 2017, California’s State Water Resources Control Board adopted a new Maximum Contaminant Level (MCL) for 1,2,3-Trichloropropane (TCP) and established that all water providers must begin testing for the element by January 2018.

Golden State Water would like to assure customers that we routinely monitor and test for more than 230 elements, including TCP, to ensure the water we deliver to customers meets all state and federal drinking water standards.

The water served to customers in each of Golden State Water’s 38 water systems meets all state and federal drinking water standards for safety. Golden State Water makes water quality information available via annual Consumer Confidence Reports (CCR).

As your water provider, we continually invest in water infrastructure, treatment and testing and take great pride in providing you with quality, reliable water.

To learn more about TCP in drinking water, please review the following information from the USEPA.

Facts About TCP In Drinking Water

  • TCP is recognized by the State of California as a human carcinogen.
  • Animal studies have shown that long-term exposure to TCP may cause liver and kidney damage, reduced body weight and increased incidences of tumors in numerous organs
  • Short-term exposure to high levels of TCP may cause irritation of eyes, skin and the respiratory tract, and depression of the central nervous system. In addition, it may affect concentration, memory and muscle coordination.
  • Studies indicate that short-term exposure through inhalation of air with a TCP concentration of 100 parts per million (ppm) can cause eye and throat irritation.
  • TCP is exclusively a man-made chemical, typically found at industrial or hazardous waste sites.
  • TCP has been used as an industrial solvent and as a cleaning and degreasing agent; it has been found as an impurity resulting from the production of soil fumigants.
  • TCP will sink to the bottom of a groundwater aquifer because its density is greater than that of water. Therefore, TCP in pure form is likely to exist as dense nonaqueous phase liquid.
  • As a result of low abiotic and biotic degradation rates, TCP may remain in groundwater for long periods of time.
  • Remediation technologies available to treat TCP contamination in groundwater and soil include granular activated carbon (GAC), dechlorination by hydrogen release compound (HRC®), reductive dechlorination by zero valent zinc and others.