The Process and Water Quality Specialists

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Corrosion and Stabilization

Corrosion control treatment is a requirement of the EPA’s 1991 Lead and Copper Rule (LCR) when lead exceeds the action level of 15 µg/L and/or copper exceeds the action level of 1.3 mg/L in more than 10% of the samples taken at consumer taps.  Under certain water quality conditions, lead and copper metals are released into solution and cause challenges with respect to compliance.  Conditions known to exacerbate the issue are soft, low alkalinity waters, such as those supplies that qualified for a filtration waiver under the Surface Water Treatment Rule.  Corrosion control treatment approaches allowed under the LCR include pH and/or alkalinity adjustment and/or application of a corrosion inhibitor, such as phosphates or silicates.