Built on a Slab: Reading Mission Viejo Plumbing by Tract Era

Mission Viejo was not built house by house; it was built tract by tract, in waves, on ranch land, and each wave shipped with the plumbing materials of its moment. The first wave, from about 1966 through the late 1970s, ran copper supply lines under slabs and clay or cast iron laterals out to the street. The later southern waves ran plastic. Fifty years on, the city's plumbing calls sort almost perfectly by that map: slab pinholes and root filled laterals in the north and around the lake, pressure and fixture age questions in the south.

The slab is the second fact. With no basement and no crawl space, a supply failure has nowhere visible to go, so Mission Viejo developed a detection first plumbing culture: meter tests, acoustic listening, and pinpoint openings. Homeowners who know the warm floor sign and the quiet house meter test catch failures in the cheap week. Homeowners who wait for a stain are usually looking at a floor replacement conversation instead.

The household discipline follows from the two facts. Know your tract's era and its pipe materials. Read the meter twice a year with the house quiet. Photograph any warm spot the week it appears. And keep the water heater's age written on the unit itself, because in a garage install over finished floors, the tank's birthday is a planning document.