The final step of the water treatment process is filtration.
We run the treated water through rapid gravity filters using dual media filters (anthracite and coal over sand) to remove any remaining particles that may still be suspended in the water. The water is passed through these filters at a controlled rate and the remaining particles are captured in the filters and removed from the water.
The filtered water is then collected and flows into one of our pump stations at the water treatment plant where it is then pumped and delivered to our member and customer cities through 77 different delivery points. The cities also do their own water quality testing once the water arrives and may perform additional maintenance procedures to ensure the highest water quality.
NTMWD received approval to construct and operate a new chemical feed system at the Wylie Water Treatment Plant complex that will allow for a sodium chlorite residual to be maintained in the NTMWD South Conveyance System. Sodium chlorite has shown to be effective at suppressing virus/microbial growth and aide in maintaining desired residual disinfectant levels in potable water systems. NTMWD currently uses chlorine dioxide in the water treatment process (a chlorine-based disinfectant approved for use in drinking water systems), and chlorite residuals have periodically been present in NTMWD’s treatment processes. The location of this additional chemical feed will provide the ability for more consistency in our regional treatment processes. NTMWD has been communicating and coordinating with our Member and Customers regarding this requested treatment process change from the Texas Commission on Environmental Quality (TCEQ).