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Ozonation is a water treatment process that destroys bacteria and other microorganisms through an infusion of ozone, a gas produced by subjecting oxygen molecules to high electrical voltage.


Ozonation Benefits

  • Ozonation provides an additional barrier to protect public health

  • Ozonation enhances water quality

  • Ozonation is very effective for destroying or inactivating viruses and bacteria, as well as Cryptosporidium and Giardia

  • Ozonation reduces the formation of chlorinated disinfection byproducts such as trihalomethanes (THMs) and haloacetic acids (HAAs), which result from the interaction of chlorine and naturally-occurring organic material in the source water

  • Ozonation provides improved taste and odor control in water supply

  • Existing treatment process maximizes effectiveness of Ozonation for disinfection

  • Optimal placement of ozone facilities minimizes Ozone dose & associated cost


The utilization of ozonation as the primary disinfectant at the Wylie Water Treatment Plants is being implemented by the NTMWD to meet the Texas Commission on Environmental Quality (TCEQ) Stage 2 Disinfection Byproducts Rules. Additionally, ozone will provide an effective treatment for objectionable tastes and odors. Chlorine will continue to be used following ozonation In the water treatment process to meet TCEQ regulations as a residual disinfectant to assure the safety of the water in the transmission and distribution systems.


The following links provide a brief summary and justification for utilizing ozonation.
NTMWD Disinfection Byproducts Information - PDF Format
Texas Administrative Code Title 30 …..Rule 290.113
Texas Administrative Code Title 30 …..Rule 290.115


NTMWD current schedule includes implementation of the ozonation treatment process taking place in stages during the latter part of 2013 and early 2014. Many of the other major water providers in the Metroplex (Dallas Water Utilities, Fort Worth, and Arlington) have completed the transition to using ozone as a disinfectant. The NTMWD estimates the rate impact for ozonation to be: $0.20 / 1,000 to $0.25 / 1,000 gallons


NTMWD Ozonation Program

Projected Implementation Timeline


Ozonation Project Timeline


NTMWD Ozonation Program

Projected Implementation Status


Updated as of 3/21/13



NTMWD Ozonation Program

Cost Estimates as of 1/22/2013