The Water Treatment Plant Division includes the 50 million gallons per day Thomas S. Mackey Water Treatment Plant located in Texas City, Texas, as well as a county-wide network of treated drinking water transmission system.
Municipal customers served include Texas City, La Marque, Galveston, Hitchcock, League City, GCWCID #1 (Dickinson), GCWCID #8 (Santa Fe), GCMUD #12 (Bayou Vista), GCFWSD #6 (Tiki Island), GCWCID #12 (Kemah/Clear Lake Shores), Bacliff MUD, Bayview MUD and San Leon MUD.

For more information visit the GCWA website at:

Addition Information:
Chlorine Maintenance Announcement 2021
GCWA Announces Annual Change to Water Disinfection