The City of Grapevine does not have the production capacity or sufficient water rights from Grapevine Lake to provide water to Southlake. Water rights on surface lakes are owned by individual municipalities and /or water authorities. The water rights for Grapevine Lake were established in the 1940's at the time of construction of Grapevine Lake. Primary water rights for Grapevine Lake belong to the Park cities (Highland Park and University Park). The secondary water rights for Grapevine Lake are owned by Dallas Water Utilities. The City of Grapevine holds tertiary water rights for the lake. There are no available water rights for the City of Southlake to take water from Grapevine Lake. The City of Grapevine operates a 12 million gallon per day production capacity water plant to serve their utility customers. The City of Grapevine is also served by the Trinity River Authority. Grapevine maximizes their production facility in order to minimize the end cost to their customers. As such, no treated water is available for the City of Southlake to purchase.