Florida Drinking Water Operator "B" Practice Test

What can be a common biological pollutant found in surface water?

1. Bacteria

2. Chlorides

3. Heavy metals

4. Pesticides

The correct answer is: Bacteria

Bacteria is a common biological pollutant found in surface water because it can originate from various sources, including human waste, agricultural runoff, and wildlife. The presence of bacteria in water can indicate contamination and pose health risks, as many bacteria are pathogenic and can lead to illnesses if ingested. Surface water bodies, such as rivers, lakes, and ponds, can easily become contaminated by bacteria due to factors like urban runoff and improper sewage disposal. Such contamination often leads to the need for water treatment processes to ensure that the water is safe for consumption and recreational use, emphasizing the importance of monitoring and managing bacterial levels in these environments. In contrast, while chlorides, heavy metals, and pesticides are also pollutants found in water, they do not fall under the category of biological pollutants. Chlorides are typically associated with saltwater intrusion or de-icing activities, heavy metals stem from industrial processes and mining, and pesticides result from agricultural practices, all of which are chemical rather than biological in nature.