A sewage spill late Wednesday in Oakland prompted officials to issue an order not to come into contact with the water at Lake Temescal as they test for potential safety impacts.

Visitors can walk around and near the lake, but they’re advised not to touch the water, fish or swim in the lake, said Dave Mason, a spokesman for the East Bay Regional Park District Police Department.

“It’s closed to these activities, but the Temescal recreational activities continue to be open,” Mason said. “You can hike, bring your dog — just no water contact.”

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Alejandro Serrano is a San Francisco Chronicle staff writer. Email: alejandro.serrano@sfchronicle.com Twitter: @serrano_alej