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It’s supposed to be hot this weekend across Southern California, which means you may be considering a trip to your favorite beach.

But before you plunge into the water, you might consult the environmental advocacy group Heal the Bay’s Beach Report Card, which evaluates water quality and pollution levels at 500 of the state’s beaches.

Shelley Luce, Heal the Bay’s president and chief executive, told me that while the vast majority of the coastline had clean water during dry weather, last year’s damaging Woolsey Fire followed by this year’s wet winter sent polluting ash flowing into the sea.

“We think there’s lasting impact from the fire on water quality,” she said.

The increasing frequency and severity of wildfires close to the coast is worrisome, Ms. Luce said — particularly when they burn man-made material, which can contain pesticides and heavy metals and be even more harmful.