A few Claremont residents have reported "musty tasting" drinking water. Here is a note from the Metropolitan Water District of Southern California that might help explain the problem:
Claremont residents may be experiencing a musty taste and
odor in their tap water, but it is an aesthetic problem caused by an algae
bloom and not a health hazard, according to water quality experts.
Officials at the Metropolitan Water District of Southern
California said the taste-and-odor event is affecting tap water in eastern Los
Angeles County communities—including Three Valleys Municipal Water District,
which services Claremont—as well as southwestern San Bernardino County. The
impacts may vary as local agencies blend imported Metropolitan water with local
supplies.
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The earthy taste and smell stem from an especially large and
persistent algae bloom in the east branch of the State Water Project, according
to Jim Green, Metropolitan’s manager of water system operations.
“We are working with the State Department of Water Resources
(DWR)—which owns and operates the state system—to address the situation,” Mr.
Green said. “Consumers, however, can be assured that the taste-and-odor issues
they may be experiencing in their tap water do not pose any health risks.”
The cause has been identified as both 2-methylisoborneal, or
MIB, and geosmin. These nuisance compounds are produced from the growth of
certain algae in freshwaters throughout the world.
“Unfortunately, people with sensitive taste and smell can
detect these compounds in water levels as low as 5 parts-per-trillion,” Mr.
Green said.
Mr. Green suggested refrigerating drinking water to help
improve its taste until the problem diminishes. Though DWR water quality
experts recently applied copper sulfate, an approved method, to control the
algae bloom, Mr. Green cautions the problem may persist for another couple
weeks. Officials stressed that the treated water will be safe for consumers.
Fish and wildlife also will not be impacted.
Consumers interested in receiving additional information
about the quality of Metropolitan’s drinking water supplies can visit the
district’s website, mwdh2o.com, for the district’s annual water quality report
and other related materials.
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