Water Distribution Grade 1 Certification Practice Exam

Which sources of water are required by law to treat using filtration and disinfection?

1. Surface water sources only

2. Groundwater under direct influence of surface water

3. Groundwater sources only

4. Rainwater harvesting systems

The correct answer is: Groundwater under direct influence of surface water

The correct choice is based on regulatory requirements that apply to the management of water sources. Groundwater under the direct influence of surface water is considered vulnerable to contamination and thus requires treatment to ensure safe drinking water. This classification means that water from these sources must undergo filtration and disinfection to remove pathogens and pollutants that might be present. Surface water sources, while also needing treatment, are distinctly mentioned in regulations regarding filtration and disinfection requirements. Groundwater sources that do not have direct influence from surface water may not have the same level of risk, and therefore their treatment requirements can differ significantly. Similarly, rainwater harvesting systems, although they may require treatment depending on local guidelines, are not typically subject to the same federal regulations regarding filtration and disinfection as groundwater influenced by surface waters. Thus, option B is the most accurate as it aligns with the legal requirements set forth to safeguard public health, ensuring that drinking water from vulnerable sources is adequately treated.