Air bubbles in water due to treatment plant maintenance

November 29, 2018 at 8:51 am

Update: City of Mesa water customers who reside in the area east of the Loop 101 to Val Vista and north of Baseline Road may experience subtle cloudiness in their water from November through January. Residents can rest assured that their water is safe and continues to meet all state and federal water quality standards.

Cloudy water can result when the Water Resources Department temporarily switches from surface water to well water to perform routine treatment plant maintenance. In this case, the Val Vista Water Treatment Plant is having maintenance performed beginning in November and will return to regular service January, 2019.

"Dissolved air is often found trapped in groundwater," Water Quality Supervisor Ken Marshall said. "Our water distribution system is pressurized, causing any air that is present in groundwater to remain dissolved in the water until the pressure is released at the customer's tap. Dissolved air can cause water to have a cloudy or milky appearance, but it is safe to drink and will not damage plumbing or appliances."

For more information, visit or contact the Water Quality Division at (480) 644-6461 or

Contact: Kathy Macdonald, Water Resources

(480) 644-4364