What is the secondary limit for fluoride?

The secondary limit for fluoride is set at 2.0 mg/L. This guideline is established by the Environmental Protection Agency (EPA) to address aesthetic concerns related to drinking water, such as taste and odor, rather than health effects. Fluoride in drinking water can help prevent dental cavities, but in excessive amounts, it can lead to fluorosis, which affects the appearance of teeth. The secondary maximum contaminant level (SMCL) is not mandatory but serves as a recommendation for water quality; exceeding this level could indicate a need for remediation strategies to improve the water's palatability and safety for human consumption. This understanding is vital for water laboratory analysts as they assess drinking water quality and ensure public health protection.