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The EPA suggests a guidance level for sodium of 20 ppm in drinking water for those on severely salt-restricted diets. A level of 200 ppm or less is suggested for unrestricted di- ets. http://74.125.113.132/search?q=cache:9pH0hmG4-yoJ:www.dhss.delaware.gov/dph/hsp/files/watertest.pdf+drinking+water+salt+ppm&hl=en&ct=clnk&cd=5&gl=us
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