Great drinking water is one more reason Oklahoma City is a great place to live. From Six Reservoirs Oklahoma City's water supply comes from six reservoirs and is purified at three water treatment plants. The North Canadian River collects water from streams and tributaries across northwestern and north central Oklahoma and feeds two of our reservoirs, Lake Hefner and Lake Overholser. When rainfall is below normal, water from Lake Canton in western Oklahoma can be released into the North Canadian to fill these reservoirs. We continuously monitor water leaving treatment plants for residual chlorine.
Chlorine protects our system from bacterial growth.
Turbidity, a measure of the clarity of the water, is also monitored. To further ensure safe water, our certified labs routinely sample and test for microorganisms. Some people may be more vulnerable to contaminants in drinking water than the general population. These individuals should seek advice about drinking water from their health care provider. Microbiological Quality No fecal coliform or E-coli were detected in any of the 3,158 tests run in 1999.