How often must a fluoride concentration be tested by operators who are fluoridating the public water supply?

• A. Weekly
• B. Daily
• C. Monthly
• D. Annually

Answer: (B)

Fluoride dosing is adjusted frequently because the amount added must keep up with daily changes in flow and water quality. Testing daily ensures the concentration after fluoridation remains within the target range and before distribution, so the public receives the intended benefits without over- or under-fluoridation. If you tested less often, like weekly, monthly, or annually, deviations could go unnoticed for too long, risking regulatory noncompliance and potential taste or health issues. Regular daily checks allow quick adjustments to the feed rate and maintain consistent, safe fluoridation.