PILLAR: Sustainable
AGENDA DATE: June 24, 2026
COUNCIL DISTRICT(S): Citywide
DEPARTMENT: Dallas Water Utilities Department
PRIORITY: Infrastructure
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SUBJECT
Title
Authorize Supplemental Agreement No. 5 to the professional services contract with Carollo Engineers, Inc. to provide additional engineering services for water quality improvements at the Bachman Water Treatment Plant - Not to exceed $490,629.00, from $10,727,425.00 to $11,218,054.00 - Financing: Water Capital Improvement G Fund
*In alignment with Water and Wastewater Capital Improvement Program.
Body
BACKGROUND
In June 2006, the Dallas Water Utilities Department (DWU) initiated a two-part study to investigate the cause of water quality concerns in parts of the water delivery system. The study and requisite testing confirmed that the treated water chemically changes as it moves through the water distribution system. Recommendations included process changes, design, construction, and implementation of improvements at all three water treatment plants to improve water quality and deliver stable treated water into the distribution system.
On June 23, 2010, the City Council authorized a professional services contract with Carollo Engineers, Inc. to perform engineering services at the Bachman Water Treatment Plant (WTP) for water quality improvements. The Bachman WTP was constructed in the late 1920s and underwent expansions in 1936, 1948, and 2006. The plant can treat 150 million gallons of water per day and is Dallas' only water treatment plant located within the city limits. The completed efforts have provided significant water quality improvements, leading to more stable water in the distribution system for areas served by the plant.
Supplemental agreements have been authorized since the award of the original contract to complete additional evaluations, provide final design improvements, prepare construction plans and specificat...
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