Duncan has notified residents that the city's water supply has exceeded the maximum contaminant level of a chemical that's used to disinfect the water.
Public Works Director Scott Vaughn says the levels of trihalomethanes, or THMs, slightly exceed federal standards. THMs are a byproduct of the chlorine used to treat the water.
Vaughn says the city notified water customers this week in a letter. Vaughn tells the Duncan Banner that that people with compromised immune systems, the elderly, and those with infants should contact their doctors about drinking the city's water.
Ongoing drought conditions are being blamed for the situation. Vaughn says the raw water quality has been reduced in Waurika Lake as the water levels drop, which requires more treatment.
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