Frequently Asked Questions
Is the chlorine level tested during this period?
What is Chlorine Maintenance?
Yes, chlorine is tested and many other compounds in water are monitored continuously. NTMWD conducts a quarter million tests each year in a state-certified laboratory to monitor, regulate and report water quality. During the disinfectant change in 2018, the Texas Commission on Environmental Quality (TCEQ) also collected 117 samples from 31 public water systems that deliver NTMWD water to confirm compliance. In some cases, NTMWD is voluntarily increasing the frequency of testing above what is required.
NTMWD first disinfects water using ozone and chlorine as part of the treatment process to
eliminate bacteria and viruses. Then, for most of the year, NTMWD also adds chloramine (chlorine + ammonia) as a secondary disinfectant to keep drinking water clean as it travels from the treatment plants through miles of pipes to homes and businesses. Each spring for one month, NTMWD temporarily suspends the use of ammonia and uses free chlorine as the secondary disinfectant to maintain water quality year-round.
What can I do if I don’t like the chlorine taste or smell?
Why is this change necessary?
The closer you live to the water treatment plant, the more noticeable the chlorine odor or taste may be. Some tips include refrigerating water in an open pitcher, adding a slice of citrus/cucumber several hours before using or using a NSF International (NSF/ANSI) approved water filter. Check out more tips at nsf.org.
This change is a common water system maintenance practice among water providers in states with warmer climates. NTMWD uses it to maintain the system and ensure high water quality.
Why are the fire hydrants flushed during this process?
When does the change occur?
Local water providers (cities or utility districts) who receive NTMWD water may help move the chlorine-disinfected water through the
The temporary change usually occurs for about a month each year from the end of February through early April. It is done before the hotter summer temperature, which can increase the potential for bacterial growth in pipes.
system faster by flushing water out of fire hydrants. Frequent flushing helps maintain the system, ensure high water quality and reduce the chlorine odor and taste. Performing system flushing in the spring also helps save valuable water during the summer months.
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PLANO SOUTH EDITION • FEBRUARY 2022
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