Florida Wastewater Practice Test

What does a high level of specific conductance in water indicate?

1. Low mineral content

2. Presence of sewage contamination

3. High concentration of dissolved ions

4. Low bacterial pollution

The correct answer is: High concentration of dissolved ions

A high level of specific conductance in water is indicative of a high concentration of dissolved ions. Specific conductance is a measure of the water's ability to conduct electricity, which increases as more ions are present. Ions such as sodium, chloride, calcium, magnesium, and sulfate contribute to this conductivity. Therefore, a high specific conductance typically reflects a significant amount of dissolved salts and minerals in the water. In examining the other options, low mineral content would naturally result in lower specific conductance; thus, it contradicts the premise of high levels. Presence of sewage contamination might increase specific conductance due to dissolved organic matter and ions, but it is not a definitive indicator, as many sources may contribute to conductivity. Low bacterial pollution would not directly relate to specific conductance measurements, as bacteria do not significantly contribute to the conductivity of water. Hence, the presence of dissolved ions is the most accurate interpretation of high specific conductance in water.