Many of the compounds used to treat water from the Edwards Aquifer are unregulated, even though some are associated with increased cancer risk. SanAntonio SATX SanAntonioTX EnvironmentalJustice environment Texas cleanwater water
New attention is being paid to contaminants that are byproducts of that treatment.
Though these compounds show up in San Antonio tap water, they're either unregulated or appearing at limits below those set by the Environmental Protection Agency. But public health experts are concerned there's not enough information about them, and what happens when a multitude of contaminants are present in drinking water.
Any Hill Country resident who's dug a post hole has probably come across a slab of limestone that looks like a cross section of a giant, worm-eaten apple. That's because rainwater is mildly acidic and slowly eats through the carbonate limestone under the Hill Country, creating uncounted pathways for water, some tiny, some huge.
SAWS is required to monitor tap water, but it also monitors the wells at its source. If bacteria levels spike, the utility can cut off one well and has a diverse enough water supply to replace it with others, officials said. However, the byproducts of adding chlorine to eliminate dangerous bacteria and other organic matter account for most of the contaminants found in SAWS tap water, according to experts.
While there remains a lack of data about the impact of many drinking water contaminants, the EPA's regulations aren't based solely on health impacts, A&M's Roh said. The regulatory agency considers other factors, like how many water systems in which a contaminant is found and the potential cost of more stringent limits.
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