Starting Today through the 30th:
Annual System Maintenance
Water disinfection is required to protect public health and keep our water safe. North Texas Municipal Water District (NTMWD) uses proven and highly effective disinfection methods to treat the water we deliver to about 2.3 million North Texans. Our annual temporary change in disinfection is required to protect public health. This maintenance procedure is essential to keeping our water safe as it travels to your tap across our 2,200-square-mile service area. The annual temporary change in disinfectant will occur from March 2 - 30, 2026.
Need for Disinfection
Disinfection is a critical part of water treatment to keep water safe. During NTMWD's normal water treatment processes, disinfection is a two-step process that first treats the water at the plant and second adds disinfectant to maintain water quality as it travels long distances through pipes to homes and businesses. Both steps are needed to keep tap water free of harmful microorganisms, such as parasites and viruses.
NTMWD uses a combination of ozone and free chlorine (first step) to disinfect water at the treatment plant and then adds ammonia to form chloramines (second step) before leaving the plant. This maintains required water disinfection levels from the time it leaves the treatment plant all the way to your tap. According to the Texas Commission on Environmental Quality (TCEQ): "Treatment prior to distribution may utilize a number of different disinfectants, but a public water system is required to use either chlorine or chloramine in the distribution system."
Temporary Change in Disinfection
Each spring for about one month, we suspend the typical use of ammonia to allow the remaining chlorine to keep the water disinfected as it travels through the system. This temporary change in disinfectant helps maintain the system and high water quality year-round. It's important to do this before summer because hotter temperatures can increase the potential for bacterial growth in pipes.
Common Disinfection Practice
Many water providers who use chloramine maintain their systems using this same process. NTMWD has been doing this for over 15 years, and high water quality has always been maintained.
Ongoing water testing required by the Texas Commission on Environmental Quality (TCEQ) is performed during the process and made available to the public.
Check Ball Field Status Before You Head Out! 
March 9 | 
12:00 PM
Grayson College – South Campus
Join us for a day of sipping, shopping and exploring our historic downtown! 
