What are the disinfection requirements for commissioning piping or equipment in potable water service?
• Arizona Department of Environmental Quality (ADEQ) Bulletin No. 8, “Disinfection of Water Systems”, specifies the methodology and requirements for the disinfection of new piping and equipment. Bulletin No. 8 also discusses disinfection using chlorination as well as safety measures and emergency disinfection procedures. In addition to the disinfection procedures specified in ADEQ Bulletin No. 8, the following American Water Works Association (AWWA) standards may be used: • AWWA Standard C651-05 – “Disinfecting Water Mains” • AWWA Standard C651-05 – “Disinfecting Water Mains” • AWWA Standard C653-03 – “Disinfection of Water Treatment Plants” • AWWA Standard C654-03 – “Disinfection of Wells” To verify effective disinfection, bacteriologic samples must be collected from the same locations at the time intervals and frequency specified by the above standards. The samples must be analyzed by a laboratory within 24 hours of collection of the sample. Samples should be maintained at or near 4o
