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<br />. <br /> <br />00234J <br /> <br />. <br /> <br />all of the ranges recommended by the Public Health Service. For this <br /> <br />reason, we raised the Public Health standard from 500 parts to 1,000 <br /> <br />parts, although our criteria did provide that concentrations of <br /> <br />specific elements would fall within Public Health Service recommenda- <br /> <br />tions. <br /> <br />From purely a health viewpoint, it is difficult to estab- <br /> <br /> <br />lish water quality standards for total dissolved solids. There is <br /> <br /> <br />little evidence that people suffer health damage by consuming water <br /> <br /> <br />throughout their lifetimes with a far greater proportion of dissolved <br /> <br /> <br />solids than recommended by Public Health standards. It is my own <br /> <br /> <br />feeling that a great deal of additional research is needed in this <br /> <br /> <br />field. There is no doubt, however, that hardness in water causes a <br /> <br />considerable amount of damage to water distribution systems and to <br /> <br /> <br />household appliances. In any event, the achievement of Public Health <br /> <br /> <br />standards is certainly a desirable goal, although not always practical. <br /> <br /> <br />Since the available funds would not permit a study of all <br /> <br />communities whose water supplies exceeded Public Health standards, a <br /> <br />decision was made to select six representative communities which <br /> <br />now have or are likely to have critical water quality problems. In <br /> <br /> <br />addition, present and projected population was considered. The commu- <br /> <br /> <br />nities selected were Brighton, Fort Lupton and Fort Morgan on the <br /> <br /> <br />South Platte River, and La Junta, Las Animas and Lamar on the <br /> <br />Arkansas River. Population figures for these communities range from <br /> <br />-3- <br />