SAN ANGELO, TX – The City of San Angelo Water Utilities Department announced a decrease in total trihalomethane (TTHM) levels in the public drinking water supply, now below regulatory limits.
Recent water quality sampling and analyses by the Texas Commission on Environmental Quality indicated that TTHM levels in the public water supply dropped from over 80 micrograms per liter (ug/L) in late 2024 to less than 34 ug/L in early 2025. The current four-quarter running average is below the maximum allowable level of 80 ug/L, or 0.08 milligrams per liter (mg/L).
City officials attributed the decline to the renewed use of groundwater from the Hickory Aquifer, beginning in the final weeks of 2024. TTHMs are disinfection byproducts that form when chlorine, used to treat water, reacts with dissolved organic matter and bromine. The use of chlorine disinfectant is required by both the TCEQ and the Environmental Protection Agency.
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