What is the acceptable pH range for water according to standard guidelines?

The acceptable pH range for water, according to standard guidelines for drinking water quality, typically falls between 6.5 and 8.5. This range is significant because it ensures the water is neither too acidic nor too alkaline, which can affect the water's taste, the solubility of metals, and overall water quality.

Option C specifically states a range of 6.7 to 8.5, which aligns closely with the upper threshold commonly accepted in various health and environmental regulatory frameworks. The slightly higher minimum pH value in this option still maintains water significantly within the generally accepted safe limits for both consumer safety and ecological standards.

This range is critical in maintaining water quality for drinking and also helps protect aquatic life and infrastructure. pH levels outside of this range can lead to corrosion in pipes or deposits of minerals, affecting both human consumption and environmental factors. In comparison, other choices may fall below or exceed the established guidelines, which could lead to adverse health or environmental outcomes.