When using pesticides for algae control in a public water supply reservoir, what may be required beyond labeling?

• A. No additional approvals are ever needed.
• B. Only a field-use permit from local authorities.
• C. Certification of applicator alone.
• D. Additional approvals may be required.

Answer: (D)

Using pesticides in a public water supply reservoir involves more than just following the product label because the source water has public health and environmental implications. Labels give general directions, but when the application could affect a drinking water source, regulators often require additional approvals to ensure the use won’t harm water quality or the surrounding ecosystem. These extra approvals can come from the state pesticide regulatory agency and from the water utility or local health/environmental authorities that manage the reservoir, and may include permits, written plans, timing restrictions, monitoring requirements, and public-notification steps. The goal is to coordinate with the water system’s operations and protect downstream users, rather than relying solely on labeling. If those extra approvals aren’t secured, the application would not be compliant with regulatory requirements.