Regular preventive maintenance and major repairs are performed by the SID Maintenance Division.

Regular maintenance includes hydrant flushing and maintenance, valve exercising, and main flushing. Maintenance crews also exercise, repair, and replace small equipment items in the storage tanks, pumping plants, and distribution system, such as air relief valves and meter boxes. Maintenance also tests and replaces water meters and backflow preventers.

Major repairs include leak repairs, service pipeline replacements, mainline valve replacements and hydrant repairs. Mainline pressure reducing stations are also adjusted by the maintenance crews.