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City of Glendale, Arizona - My Water - Disinfection Byproducts

Did You Know...

City of Glendale, Arizona - My Water - Disinfection ByproductsThat there are significant upcoming rule changes that the city must comply with regarding your water quality?  One of these new rules is the Stage II Disinfectants and Disinfection Byproduct Rule.  This rule will change the way the Utilities department operates its treatment and distribution systems and how it utilizes its various water sources.

This new rule strengthens public health protection for our customers by requiring our water to meet maximum contaminant levels as an average at each compliance monitoring location (instead of as a system-wide average as in previous rules) for two groups of Disinfection Byproducts ( DBPs), trihalomethanes (THMs) and five haloacetic acids (HAA5). This regulation will reduce DBP exposure and related potential health risks.

Some recent improvements are already in place and will help to ensure compliance with these stringent regulations.  For example, the city now uses a new filter media, granular activated carbon (GAC), in its treatment process.  At the Cholla water treatment plant, four filters were retrofitted and two new filters were constructed.  This project cost was approximately $11 million.  Although these filters have added between $800 thousand and $1 million in annual operation and maintenance cost, they are critical to the treatment process, and will ensure compliance we the new water quality regulations.  Additional benefits of this technology include improvements in the taste and odor of the water produced.  The city’s relatively new Oasis water treatment plant also produces a high quality of water and will play an important role in ensuring regulatory compliance.

Rest assured that we are working hard to minimize not only the cost but the operational impacts of complying with these new requirements and are dedicated to providing you safe, high quality water every day.



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