17 - Laserfiche WebLink

City of Pleasanton Water Quality Division's Report on Water Quality Relative to Public Health Goals 2022 June 2022 -Page 8 of 8 According to the Association of California Water Agencies (ACWA) Cost Estimates for Treatment Technology BAT, to install and operate a RO system costs anywhere from $2.04- $8.04 per 1,000 gallons of water treated. Over the last 3 years, the City averaged 2.9 million gallons of water per day from their wells. To install and operate a reverse osmosis system,the cost could be as much as $10.7 million/year for the life of the system. The cost per customer service connection could be as high as $486 per year. There would also be additional costs for water conditioning to ensure water treated by reverse osmosis is optimized for distribution system corrosion control. It should also be noted that this cost estimate may be imprecise as treatment costs can vary widely depending on the particulars of the situation. It is also unclear whether treatment to below the PHG for uranium could be achieved using RO, as BATs are designed to achieve compliance only to the corresponding MCL. RECOMMENDATIONS FOR FURTHER ACTION The drinking water quality in the City of Pleasanton meets all State of California SWRCB and USEPA drinking water standards set to protect public health. To further reduce the levels of the constituents identified in this report that are already significantly below the health-based Maximum Contaminant Levels established to provide"safe drinking water,"additional costly treatment processes would be required. The effectiveness of the treatment processes to provide any significant reductions in constituent levels at these already low values is uncertain. The health protection benefits of these further hypothetical reductions are not at all clear and may not be quantifiable. Therefore, no action is proposed. The money that may or would be required for these additional treatment processes might provide greater public health protection benefits if spent on other water system operation, surveillance, and monitoring programs. REFERENCES No. 1: Table of Regulated Constituents with MCLs, PHGs or MCLGs No. 2: City of Pleasanton Public Water Utility District's 2019, 2020, 2021 Water Quality Reports 8