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The Contra Costa County (Concord, Calif.) Water District's predrought THM levels, principally CHCI3, in the treated water were considerably less than the proposed MCL of 100 μg/I. As drought conditions prevailed, sea water intrusion into the district's raw water supply led to increases in TTHM. While the chlorine‐containing compounds decreased, the bromine‐containing compounds sharply increased. Laboratory and full‐scale plant studies were conducted to determine what treatment changes would be required to cope with the problem without affecting the bacteriological quality of the water.
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Lange et al. (1978) studied this question.
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