Some residents in the San Fernando Valley have reported an “earthy odor” coming from their drinking water, but officials say the cause of the smell is not harmful. In a statement issued Monday, the Los Angeles Department of Water and Power said they had received “inquiries and reports” from some customers regarding the smell and that they began testing which revealed the “musty” odor is attributable to Geosmin.  Geosmin is a natural compound created from algae, LADWP explained. … In Monday’s statement, LADWP said it began increasing its water quality monitoring, sampling and testing through the Los Angeles Aqueduct System earlier this month. Elevated Geosmin levels were detected on May 13, and “immediate adjustments” to treatment and operations were made to control the situation, LADWP said.