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HORSHAM TOWNSHIP, N.J. (CBS) — Residents are still waiting to learn when they can safely use and drink water from the tap in Horsham Township.

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A boil water advisory remains in effect for the area between Limekiln Pike, County Line, Blair Mill and Welsh Roads.

More than 16,000 residents and 150 businesses are affected.

Credit: (CBS3)

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The water warning also forced many restaurants and all Hatboro-Horsham schools to close for the day.

The disinfection system at a township well stopped working last night.

Utility crews fixed it, but now they’re waiting for results from water tests to come back.

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Officials hope to lift the advisory as soon as Saturday.