Reducing the Influence of Arsenic and Nitrates on Groundwater: The City of Phoenix Experience

Elevated concentrations of arsenic are naturally occurring in the aquifers underneath Phoenix and surrounding cities. In the past, Phoenix has utilized arsenic treatment systems and blending stations to reduce arsenic concentrations. Recently, Phoenix has implanted an ASR well program and has successfully diluted arsenic concentrations down to acceptable EPA Drinking Water Standards. Phoenix is also piloting another ASR well to do the same for elevated nitrate concentrations in these aquifers. The hope and intent is that we can reduce nitrate concentrations and eliminate the wellhead treatment and blending options.