Well this sucks but could have been worse.
Plumber can't find the leak because it appears to be under the concrete. He *thinks* the incoming water line sprung a leak and water is building up under the house faster than it can drain away.
So the water main is turned off. We called the water company and they're sending a guy out to check the line. ....Tuesday... Until then we can only turn the water on for a short time every 3 or 4 hours.
Sucks but could be a lot worse.