The Texas Commission on Environmental Quality (TCEQ) requires water treatment plants to continuously monitor the turbidity of the water and the chlorine residual at the plant. Distribution system samples are taken daily and analyzed for chlorine.
In addition, samples are also taken every month at designated locations throughout the City and analyzed for total coliform bacteria. These types of bacteria are naturally present in the environment and are used as an indicator that other potentially harmful bacteria may be present. Should the City detect a coliform bacteria during routine samples, extensive flushing, and disinfection procedures are performed and additional samples are taken and analyzed to ensure that no bacteria exist in the distribution system. When the samples are clear, the distribution system is placed back into normal operation.