Los Angeles County beaches is included in a heat advisory issued by the National Weather Service on Friday at 8:55 a.m. The advisory is in effect until Saturday Aug. 23, at 9 p.m.

Hurricane Erin will be hundreds of miles from the Massachusetts coast, but it could still cause problems at beaches.

County health departments routinely collect water samples to test for bacteria levels to ensure water is safe for swimming.

Seven Lakes State Park, Seven Lakes, Oakland County - CLOSED since July 29 due to high bacteria levels from an unknown source. Sunset Park, West Grand Traverse Bay, Grand Traverse County - contamination advisory since Aug. 20 due to high bacteria levels from wildlife.

Beaches in the town of Guardamar del Segura, in southeastern Spain, closed earlier this week after the discovery of two venomous sea slugs in the water, local authorities announced.

More beaches are closed on Friday than they were on Thursday, according to the Massachusetts Department of Public Health.

The ocean is taking more than it gives on Martha's Vineyard. Each storm is cutting deeper into South Beach in Edgartown, and the pace is accelerating.