Why doing it yourself won’t work

A two-tire system with a 10,000-gallon tank, pumps, and a scraper/conveyor system (to settle solids and facilitate washwater recycling) is about $125,000, plus another $50,000 for the surrounding building and utility installation. Useful options, such as a freshwater rinse or vibrating feature that helps get mud out of deep treads, can bring the cost of a permanent system to $250,000.

Construction firms and landfills have tried to save money by developing their own systems.

“Those folks are usually my best customers,” Waystack says. “Once they see how efficient a well-designed system is, they’re usually eager to sign up.”

Angus Stocking is a licensed land surveyor who has been writing on infrastructure topics since 2002. E-mail angusstocking@gmail.com.