The State Water Resources Control Board will set a maximum contaminant level for 1,2,3 TCP (trichloropropane) found in industrial solvents and cleaning agents, but was once found in two popular soil fumigants. The pesticide byproduct contaminated groundwater throughout the Central Valley. At present, water systems in California are required to notify residents only if the chemical is found at a certain health-based advisory level.
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California to set legal limit on likely carcinogen in water