FAIRFIELD — The town’s coastal swimming areas remain closed after a Westport sewage leak on Saturday.

The sewage leak, which was caused by an aging pipe in the process of being repaired, led to a Westport health advisory around 4 p.m. Saturday that advised discontinuing swimming in Saugatuck River and that town’s coastal waters.

The Fairfield Health Department announced Sunday morning it would also close the town’s coastal swimming areas “out of an abundance of caution.”

While Lake Mohegan remains open, other swimming areas will remain closed until sample results indicate acceptable water quality.

According to Health Department Director Sands Cleary, samples were collected Monday morning and will be returned Tuesday afternoon. Westport and Norwalk should receive water sample results around the same time.

Cleary said the Health Department took the precautionary measure of closing Fairfield’s swimming areas because the volume of material in the town’s waters is not yet known.

“Everybody’s cautious on this,” Cleary said. “We’re just trying to do the right thing here.”