Left Hand Ditch Company and Left Hand Water District are two distinct entities. We provide potable water service to customers from the foothills to I-25 and between Longmont and Boulder. Left Hand Ditch Company manages raw water, stream diversions, ditches and reservoirs on the west side of Boulder County. Please refer to SVLHWCD Ditch Directory for a directory of Boulder County ditches if you have questions concerning an open ditch that conveys water seasonally.