Internal pipeline corrosion control is usually implemented to reduce lead, copper and _____

• A. copper
• B. iron
• C. zinc
• D. lead

Answer: (B)

Internal pipeline corrosion control is about adjusting water chemistry so the inside surfaces of pipes form protective layers, which slows down the release of metals into the water. Lead and copper are the primary metals of concern for health and regulatory reasons, and iron is the other metal commonly controlled because cast iron and steel pipes can corrode and contribute iron to the water. By using corrosion inhibitors and balancing pH and alkalinity, systems reduce the solubility of iron and the rate of its release, helping to keep iron concentrations lower and water clearer. Zinc isn’t typically the target of routine internal corrosion control for distribution systems, and copper is already one of the metals being addressed.