With a water system that dates back more than a century, the city of Monroe, Mich., has always had to pay attention to repair and upkeep of its cast iron mains.But two things have come together to put the city on a much more intensive rehabilitation program. One is trenchless technology. The other is a low-interest loan program through the state and federal governments. Together, the financing and the technology — a new steam-cured lining system — have led the city to put in place a three-year plan to replace or repair 77,000 feet of water main. That’s just under
