Greetings Tom - Mark,

Over the past two days we have noticed the air cloud in both the hot and cold water lines in the kitchen.

Its been fairly cold here in Va. Beach (20s and 30s)and I'm concerned that a pipe might have cracked in the supply side of the water line.

To make matters worse, we are on slab. If this is a leak, how do I go about tracking down the location of the leak?

To check for a hidden leak go out to the water meter, look for the little hand below the read out. With all your fixtures shut off you should not see the little hand moving. The faster it moves the bigger the leak. On a pump system the gauge should not fall with every thing off and the pump up to pressure and not running. Before I did anything I would check all your toilets, a small leak running 24/7 can run your water bill sky high. . If you have a older home, 1940/75, you may have galvainzed iron pipe leading to the house from your meter or pump. If it's leaking don't even bother to dig it up. Run a new service line out of sch.#40 PVC. More questions? I'm as close as a click. Good luck and thank you for rating my reply. TOM

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If this is a leak, how do I go about tracking down the location of the leak?

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If the leak's under the slab we call in a leak detection service such as Sleuth. They detect the precise location of the leak, open up the slab, dig down, bare the leak and bag the dirt. The plumber then drains the system and repairs or replaces the faulty pipe.
Good luck and let me know what you find. Tom