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First, the good news: For the second year running, water quality at Southern California beaches has shown marked improvement.

The bad news? The cleaner summertime surf is a side effect of the state’s ongoing drought, according to a report released Thursday.

In 2015, 97% of Southern California beaches received an A or B grade for water quality during the busy summer months, according to the annual Beach Report Card released by Heal the Bay, an environmental group.

That’s up three percentage points from last year’s report.

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