The City of Walla Walla Drinking Water

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ityof Drinking Water Notice Walla Temporary Change in Water Sources: Switching from Surface Water to Groundwater Walla The City of Walla Walla's drinking water treatment plant upgrade project is entering the final stages of construction. When complete, the treatment (disinfection) process will change from ozone to UV light. In order to complete the upgrade and test the new disinfection process the City will switch the primary source of water from surface water (Mill Creek) to groundwater (deep basalt wells). During this period, customers might notice a slightly different taste, increased water hardness, and slightly warmer water. Be assured that all drinking water will continue to meet EPA and Washington State Department of Health drinking water standards. We expect the switch to take place on or about December 10, 2018 and last up to two months. Customers may contact the City's Drinking Water Treatment Plant at 522- 3775 if they have questions.