Subsidiaries

California Water Service (Cal Water) is the largest subsidiary of the California Water Service Group. Cal Water is the largest investor-owned American water utility west of the Mississippi River and the third largest in the country. Formed in 1926, the San Jose-based company serves more than 484,900 customers through 28 Customer and Operations Centers throughout the state.

CONTACT INFORMATION

Customer Support Services
(Corporate headquarters)
1720 North First Street
San Jose, CA 95112-4508
(408) 367-8200
infoGO@calwater.com
www.calwater.com

Hawaii Water Service (Hawaii Water) was formed in 2003 with the acquisition of Ka’anapali Water Corporation. Hawaii Water’s Ka’anapali District serves 700 customers on Maui, including several large resorts and condominium complexes.

In 2008, Hawaii Water acquired the Pukalani Sewerage Treatment Works, a wastewater system serving 800 customers in Pukalani, located approximately 30 miles from Ka’anapali, along with Waikoloa Water Company, Waikoloa Sanitary Sewer Company, and Waikoloa Resort Utilities, which provide water and wastewater services to homes, condominiums, hotels, golf courses, and shops at Waikoloa Beach Resort and in Waikoloa Village, both on the Big Island of Hawaii. Also in 2008, Hawaii Water formed Kona Water Service Company on the Big Island to provide water and wastewater services to residences and businesses on the Kukio Resort.

In 2020, Hawaii Water expanded its service onto Oahu with the acquisition of Kalaeloa Water Company, a water and wastewater utility located in the growing Kapolei area of the City and County of Honolulu on Oahu.

Today, Hawaii Water serves 5,000 regulated accounts on Maui and Hawaii, many of which are large users.

CONTACT INFORMATION

68-1845 Waikoloa Road, Unit #216
Waikoloa, HI 96738
Phone:(808) 883-2046
(877) 886-7784 toll-free
www.hawaiiwaterservice.com

In 2002, New Mexico Water Service (New Mexico Water) was formed with the acquisition of the Rio Grande Utility Corporation, which added 2,265 water and 1,600 wastewater customers. The 2003 acquisition of National Utility Company added another 1,600 customers to the New Mexico subsidiary. Since then, New Mexico Water has made three other acquisitions: Cypress Gardens Water Users, Independent Utility Company, and the assets of Indian Hills Water Company. New Mexico Water is headquartered in Rio Communities, N.M., south of Albuquerque, and also has Customer Centers in Elephant Butte and Cedar Crest.

CONTACT INFORMATION

401 Horner St.
Rio Communities, NM 87002-6322
Phone: (505) 864-2218
www.newmexicowater.com