That musty stench in your sink this week may be coming from Los Angeles drinking water across the San Fernando Valley.

The Los Angeles Department of Water and Power attributes “an earthy or musty odor” in tap water that has been the subject of complaints this week by Valley customers to a harmless algae bloom caused by downpours in the Owens Valley.

The utility did not send out a news release to local media about the smell, but posted an online statement Tuesday after reports by two TV stations saying it was sending out notices to its Valley customers.

“We hope to minimize any inconvenience to our customers,” LADWP Director of Water Quality Albert Gastelum said in a statement. “Carbon filters, like tap or pitcher filters, can reduce the odor.

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“We are committed to resolving the algae problem as expeditiously as possible and will continue to provide updates as more information becomes available.”

The LADWP blamed the odor coming out of Valley taps on seasonal algae growth in the Owens Valley following the drought-busting levels of winter rainfall. It said a strain of blue-green algae known as Anabaena produces the odorous compound and is common to water systems across the world.

The odor is not a cause for health concern, officials said.

“It is safe,” LADWP Chief Operating Officer Marty Adams told the Daily News. “We’re doing extensive testing to make sure that it is safe. This strain of algae is pretty predominant. It’s a typical thing. It’s basically a nuisance.”

Officials said the agency was closely monitoring potential algae growth along the 233-mile Los Angeles Aqueduct from the Owens Valley to Sylmar in order to stymie the recent water stench.

While certain blue-green algae can produce toxins that can cause human health impacts, according to the LADWP, routine monitoring and testing for various algal toxins in the area do not show any detectable level.

If levels increase, the utility reported it would consider adding the herbicide copper sulphate to eliminate the algae. This year, Los Angeles is expected to get 70 percent of its water from Sierra runoff into the Owens Valley.

But chances are, Adams said, that a chemical solution will not be needed as the number of odor related complaints were steadily decreasing. On Tuesday, there were 14 complaints, Tuesday 15, Wednesday 8 and by midafternoon Thursday, one complaint.

“The calls are lessoning,” he said. “We’re tweaking treatments at the filtration plant. The problem will go away. We’re hoping that Mother Nature will do it herself, which is the best way.”

The smelly tap water comes less than two months after Los Angeles celebrated the 30th anniversary of its L.A. Aqueduct Filtration Plant in Sylmar, which treats water flowing in from the aqueduct. The event, which drew a crowd of 150 officials and residents, also hailed the city’s third annual Tap Water Day to draw attention to the quality of L.A. drinking water.

Last year, the LADWP supplied nearly 160 billion gallons of drinking water to more than four million residents and businesses.

“We’re making sure that Los Angeles has some of the cleanest drinking water in America,” Mayor Eric Garcetti had said, “and will never compromise the high standards of quality and service that Angelenos deserve.”