Billionaire Elon Musk said late Wednesday that he would fund “fixing the water in any house” in Flint, Mich., that remains contaminated above acceptable federal levels.

Musk said that anyone in Flint should reply to his tweet with test results and he will “send someone to install a water filter.” The Tesla Inc. TSLA, +1.95% chief executive also said he would set up an email address Thursday to accept submissions.