(Wylie, Texas – November 14, 2025) Crews at the North Texas Municipal Water District (NTMWD) South Mesquite Regional Wastewater Treatment Plant (RWWTP) discovered an underground leak, resulting in an unauthorized spill of domestic wastewater onsite at 3500 Lawson Road, Mesquite, Texas. The leak is no longer active, and the spill was fully contained within a recently constructed excavation pit.
There has been no environmental impact. The District and contracted construction crews are working around the clock to complete the evaluation of the damaged pipe and perform repairs. NTMWD is committed to protecting public health and the environment. This incident does not impact the NTMWD potable water system; drinking water delivered by NTMWD is safe for human use and consumption.
At approximately 2:30 p.m. on Thursday, November 13, NTMWD crews observed partially treated wastewater flowing into a construction excavation pit contained within the plant site. Crews immediately began further excavation to locate the source of the leak. The source of the leak was located on a damaged 42-inch pipeline and stopped at approximately 4:30 a.m., Friday, November 14.
The leak of an estimated 190,000 gallons of partially treated wastewater was completely contained within the excavation pit and was returned to the plant for treatment. NTMWD personnel are monitoring the impacted area and will perform the appropriate cleanup activities once the damaged pipeline repair is complete.
NTMWD personnel have notified the appropriate local governmental officials and the Texas Commission on Environmental Quality (TCEQ) Regional Office of this event.
Should you have any questions regarding this matter, please contact NTMWD at 972-442-5405 or by email at publicrelations.info@ntmwd.com.
TCEQ precautionary statements:
Persons using private drinking water supply wells located within 1/2 mile of the spill site or within the potentially affected area should use only water that has been distilled or boiled at a rolling boil for at least one minute for all personal uses including drinking, cooking, bathing, and tooth brushing. Individuals with private water wells should have their well water tested and disinfected, if necessary, prior to discontinuing distillation or boiling. Persons who purchase water from a public water supply may contact their water supply distributor to determine if the water is safe for personal use.
The public should avoid contact with the waste material, soil, or water in the area potentially affected by the overflow. If the public comes into contact with waste material, soil, or water potentially affected by the overflow, they should bathe and wash clothes thoroughly as soon as possible.