Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

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What is the desirable pH level for treated water to avoid corrosive conditions?

The correct answer is: 7.0

The desirable pH level for treated water is typically around 7.0, as this is considered neutral on the pH scale. This neutral pH helps to minimize corrosive conditions within the water distribution system. Water with a pH level lower than 7.0 becomes increasingly acidic, while levels above 7.0 become alkaline. Acidic water can lead to corrosion of pipes and metal fixtures, potentially resulting in the leaching of harmful metals such as lead and copper into the water supply. Maintaining the pH at around 7.0 helps to create a balanced environment that reduces the risk of such corrosive issues, ensuring safer drinking water and extending the lifespan of plumbing infrastructure. In more specific terms, while options such as 6.5 and values below represent mildly acidic conditions that can encourage corrosion, and values above 7.5 can lead to alkaline conditions, which may also present challenges, a pH of 7.0 is optimal for maintaining stability and preventing corrosion in treated water systems.