City of Mesa News Article
Water Changes Due to Treatment Plant Maintenance
By: Kimberly Nelson
08/29/13 8:18 AM

Date: August 29, 2013
Water Resources Department
Contact: Kimberly Nelson
Office: 480-644-6553; Cell: 605-661-8350
Water Changes Due to Treatment Plant Maintenance

Mesa, AZ – City of Mesa water customers who reside in the area east of the Loop 101 to the Eastern Canal and north of Baseline Road may have noticed a subtle change in their tap water - cloudiness.  This is because Mesa Water is temporarily switching from using surface water to well water while maintenance is performed at the Val Vista Water Treatment Plant and the Pasadena reservoir. Well water in the northern part of the City will be used until early Spring of 2014.
Even though water may, at times, appear cloudy or milky, it is completely safe to drink and continues to exceed stringent state and federal water quality standards.
"Mesa Water’s distribution system is pressurized, causing any air that is present to be dissolved in the water until the pressure is released at the tap," Water Quality Supervisor Ken Marshall said.  Dissolved air in the water is not harmful to people and will not damage plumbing or appliances. However to some people, it may have an appearance of being “milky” or white when filling a glass of water.   “An easy solution is to fill a pitcher with tap water and place it in the refrigerator,” Marshall suggested. “The water will be crystal clear and cold when the next glass of water is poured from the pitcher.”
The release of pressure can create millions of tiny air bubbles causing a cloudy appearance in tap water.  It may take several minutes for the air to escape. As it does, the water will clear from the bottom up.  Leftover dissolved air can cause the water to sparkle or have small bubbles.  
Dissolved air is natural and present in many of the City of Mesa's groundwater production wells. There are several factors that can influence the amount of dissolved or "entrained" air from deep wells, including:
•Locations of the perforations in the well casing;
•Depth of the well;
•Static water levels (depth of water) in the well; and
•Quantity of water pumped.
For more information about cloudy water, visit Mesa Water’s website at

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