On Tuesday, April 4, the Board of Directors of the Sonoma County Water Agency (Sonoma Water) approved a $6 million contract for recoating two major water storage tanks, Cotati Tank No. 1 and Kastania Tank, the largest infrastructure upgrade project to date.
The Cotati Tank No. 1 and Kastania Tank Recoating is part of Sonoma Water’s Tank Maintenance Program, an essential element of Sonoma Water’s Capital Improvement Plan that protects the transmission system’s 18 above-grade welded steel water storage tanks through targeted proactive maintenance actions, structural repairs and cathodic protection systems.
The age of coatings on Cotati No. 1 tank and Kastania tank are 25 and 38 years, respectively and coatings last between 20-25 years. Based on recent dive inspections, condition assessments, and staff observations, the coating systems on both tanks have exceeded their useful life and require removal and replacement.
This contract with AMP United LLC for $6,450,000 consists of the removal and replacement of protective coatings, installation of health and safety improvements, and cathodic protection systems to maintain the functional lifespan of Cotati No. 1 and Kastania tanks.
Sonoma Water’s 18 water tanks provide 129 million gallons of storage, which is approximately three times the average daily system demand. Maintaining and improving the reliability of the water system storage tanks is vital in continuing to provide clean drinking water to approximately 600,000 residents in nine major cities and water districts within Sonoma and Marin counties.
