Listening to every heart
The "Act of God" would reference any "natural break, leak, wear, tear, design, [growth of tree through, around, over, on pipes]..." that could not be "foreseen, known of, acted upon," [you get the gist]...
Playing devil's advocate here.
As Nan said, have dates, times, facts in hand...
and get ready to stand in a long line. They're bigger, "older and have more insurance than you" [Fried Green Tomatoes] and they will simply wait until you get frustrated.
If I were you? I'd call an attorney specializing in EPA laws. THAT would get their attention.