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Johnston keeps stage-3 watering ban as nitrate levels fall; CIWW planning treatment expansions
Summary
City staff reported that Raccoon River nitrate concentrations have fallen from 15.46 mg/L on July 4 to 12.27 mg/L but remain above the 10 mg/L threshold required to lift a stage-3 lawn-watering ban. CIWW officials are planning expansions and new treatment plants.
City staff told the Johnston City Council that the stage-3 lawn-watering ban remains in effect while source-water nitrate concentrations gradually decline, and they outlined infrastructure work CIWW (Central Iowa Water Works) is planning.
City staff compared recent nitrate readings, saying the Raccoon River measured 15.46 milligrams per liter on July 4 and was 12.27 mg/L at the most recent test. Staff said lifting the stage-3 ban requires at least…
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