If a water system exceeds the action level for lead and copper, it must measure other contaminants as well. What parameter must be measured in the field?

If a water system exceeds the action level for lead and copper, it must measure other contaminants as well. What parameter must be measured in the field?

• A. Conductivity
• B. Alkalinity
• C. pH
• D. Calcium

Answer: (C)

Measuring pH in the field is essential because the amount of lead and copper that can dissolve into drinking water is highly sensitive to pH. After a system exceeds the action level, corrosion-control measures are put in place to keep metals from leaching into the water, and real-time field pH monitoring helps ensure the water stays in a range that minimizes solubility and release of metals. While alkalinity, calcium, and conductivity relate to overall water chemistry, they don’t provide the immediate, actionable indicator of corrosion control that pH does in this context.

Measuring pH in the field is essential because the amount of lead and copper that can dissolve into drinking water is highly sensitive to pH. After a system exceeds the action level, corrosion-control measures are put in place to keep metals from leaching into the water, and real-time field pH monitoring helps ensure the water stays in a range that minimizes solubility and release of metals. While alkalinity, calcium, and conductivity relate to overall water chemistry, they don’t provide the immediate, actionable indicator of corrosion control that pH does in this context.