Temporary change in water disinfectant is essential for safe drinking water WYLIE, TX – Jan. 31, 2024 — The North Texas Municipal Water District (NTMWD) will temporarily change the disinfectant in its water treatment process from March 4 through April 1, 2024. The annual, routine change is necessary to maintain the regional system and year-round water quality. Click here to read more on NTMWD website.