Field Office Compliance - Assistance

Assistance ID - 133839

Osceola Water Works - 310338248

2320 WEST CLAY STREET Osceola, IA 50213

Clarke County

FO 5

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Date	Comment	Commenter
3/4/2025	From: <grant@granttechsolutions.com> Date: Fri, Feb 28, 2025 at 7:00?AM Subject: RE: copper sulfate question To: Gastineau, Janet <janet.gastineau@dnr.iowa.gov> Janet, I’m no expert on this topic but am happy to share my thoughts. Which are: anything is possible, I suppose, but think it unlikely that the wastewater effluent data shown in the graph below resulted from copper sulfate addition. My limited research leads me to believe that the water column impacts of copper sulfate addition are not so long lasting as the graph indicates. By that I mean the copper sulfate may have an immediate impact on the copper concentration in the reservoir water and therefore the treated drinking water and therefore the influent wastewater and therefore the wastewater effluent ... but the impact passes in a few days or weeks, not months or year-plus. Then again, from my readings, much of copper goes into reservoir sediments and may therefore leach out over a period of time. I recommend the following to answer the question. Collect and compile frequent copper testing of the drinking water at the wastewater treatment plant. Similarly collect and compile frequent copper testing of the wastewater influent. Look for trends. Draw conclusions.	JANET GASTINEAU

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