If a water system exceeds the 90th percentile of either the lead or copper action levels, it must also assess _______.

If a water system exceeds the 90th percentile of either the lead or copper action levels, it must also assess _______.

• A. Its source water
• B. Its pH levels in the distribution system and increase pH if too low
• C. Its entire treatment process
• D. Whether to implement a point-of-use program for the areas affected

Answer: (A)

When a system exceeds the lead or copper action level, the main step is to identify where the lead and copper are coming from. The best next move is to assess the source water because understanding the chemistry and corrosivity of the source helps determine whether the issue is driven by the water entering the system or by materials in the distribution system and plumbing. By evaluating the source water, you can decide if changes at the source or adjustments to corrosion-control strategies in the distribution system are needed. This assessment focuses on where the problem originates, guiding effective corrective actions. While adjusting pH or applying corrosion inhibitors can be part of the eventual solution, the required assessment is about evaluating the source water itself. Other options like reviewing the entire treatment process or implementing a targeted point-of-use program aren’t the mandated initial assessment in this scenario.

When a system exceeds the lead or copper action level, the main step is to identify where the lead and copper are coming from. The best next move is to assess the source water because understanding the chemistry and corrosivity of the source helps determine whether the issue is driven by the water entering the system or by materials in the distribution system and plumbing.

By evaluating the source water, you can decide if changes at the source or adjustments to corrosion-control strategies in the distribution system are needed. This assessment focuses on where the problem originates, guiding effective corrective actions. While adjusting pH or applying corrosion inhibitors can be part of the eventual solution, the required assessment is about evaluating the source water itself. Other options like reviewing the entire treatment process or implementing a targeted point-of-use program aren’t the mandated initial assessment in this scenario.