ABSTRACT
This chapter includes the essentials of modern water treatment; namely, disinfection and sand filtration. It also implies that water is a vector for transmission of impurities and diseases. Drinking water standards published in 1946 were essentially the same as the 1942 standards, with the exception that a tolerance limit was added for hexavalent chromium. Hazardous substances are defined in the Comprehensive Environmental Response, Compensation and Liability Act, and pesticides registered under the Federal Insecticide, Fungicide, and Rodenticide Act must be considered. The 1986 Safe Drinking Water Act amendments included a revised total coliform rule that was promulgated finally in 1989. This revised rule established an maximum contaminant level goals for total coliforms at zero and a maximum contaminant level based on the presence-absence of total coliforms. The European Economic Community issued a council directive in 1980 that related to water quality intended for human consumption.
