ARNOLD AIR FORCE BASE, Tenn. -- On Feb. 4, the AEDC Water Plant received a notice for violating a federal drinking water standard. Although this situation does not require that you take immediate action, you as a customer have a right to know what happened, what you should do, and what was done to correct this situation.
During the Oct. 1, 2025 through Dec. 31, 2025 compliance period, the water system's locational running annual average (LRAA) at site #201, Commissary building 125, for total trihalomethanes (TTHM) has been calculated to be 0.0967 mg/L. This value exceeds the maximum contaminant level (MCL) of 0.080 mg/L set for this parameter.
TTHMs are disinfection byproducts resulting from our chlorination of the water to minimize risk of microbial life in the drinking water. The Environmental Protection Agency considers microbial contaminants as the greatest risk to the public. We are evaluating the results of the required disinfection and will continue to make an effort to reduce the disinfection byproducts without increasing the microbial risks. We will continue to monitor the system in order to provide safe drinking water for our customers.
What should you do?
• You do not need to boil your water or take other actions. However, if you have specific health concerns, consult your doctor. If a situation arises where the water is no longer safe to drink, you will be notified within 24 hours.
• If you have a severely compromised immune system, have an infant, are pregnant, or are elderly, you may be at increased risk and should seek advice from your health care providers about drinking this water.
Some people who drink water containing trihalomethanes in excess of the MCL over many years may experience problems with their liver, kidneys, or central nervous systems, and have an increased risk of getting cancer.
For more information, please contact Arnold AFB Bioenvironmental Engineering at 931-454-4272.
Please share this information with everyone who may drink this water, including those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand or mail.
This notice is being sent to you by AEDC Water Plant. PWS ID#: TN0004408. Date distributed: 12 February 2026