Tom Walton is an Iowa attorney and was a Democratic primary candidate in Iowa House district 28.
In early June, the Des Moines Water Works turned on its nitrate removal facility for the first time in five years. It had to do so because of increasing nitrate levels in in the Raccoon and Des Moines Rivers. Extra treatment is required to meet the U.S. Environmental Protection Agency’s Safe Drinking Water Standards. For nitrate, that level is 10 milligrams of nitrate-nitrogen (NO3-N) per liter of water. Des Moines Water Works provides drinking water to roughly 600,000 central Iowans.
This has been an ongoing battle. In 2013, nitrogen levels at the testing equipment near Van Meter upstream from on the Raccoon River from Des Moines were a record 24 mg/L—more than double the EPA safe level. On June 2 of this year, that station measured a median of 20.4 mg/L.
However, a growing body of scientific research indicates that long-term ingestion of water from public water sources with nitrogen levels below the EPA maximum contaminant level (MCL) have been associated with a higher risk of some forms of cancer and other adverse health effects, although more study is needed to support more conclusive results.
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