In August 2012, Danbury, N.C., became the first U.S. city to formally contract ice pigging service to clean its water mains. The technique employs the friction of ice slurry to remove impurities such as biofilm, iron and manganese sediment from water pipes, without the use of mechanical systems. A local success, ice pigging is now being mobilized across the country.Danbury is a town of fewer than 200 people located close to the southern border of Virginia, about 50 miles northwest of Greensboro. The water system is only 40 years old and was acquired by Stokes County in 1978 and leased
