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Aurora to begin orthophosphate dosing as short-term step to reduce lead in drinking water
Summary
City staff recommended adding di-potassium orthophosphate at a temporary feed this March to reduce lead in homes served by lead service lines; a pipe-loop study and CDM Smith report informed the plan, with a likely 2 mg/L dose identified as most cost-effective and a procurement cost roughly $300,000 for the year.
Mayor Lesch and the Committee of the Whole heard a technical briefing Feb. 17 from Bob Lively, the city's water production superintendent, on steps Aurora will take to reduce lead in drinking water.
Lively said the city's consultant, CDM Smith, completed a corrosion-control study with pipe-loop tests that compared three orthophosphate dosing levels. "We studied 3 different doses, a 1 part per million or milligram per liter, a 2 milligram per liter, and a 3 milligram per liter dose," Lively said, and he added that the 2 mg/L dose "was determined to be the most cost effective and produced the best overall result." He said the study will inform a recommendation the city submits to the Illinois Environmental Protection Agency (IEPA).
Why it matters: Aurora's 2025 monitoring showed lead at…
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