What is the quality standard for fluoride levels in drinking water?

What is the quality standard for fluoride levels in drinking water?

• A. < 0.4 mg/L
• B. < 4 mg/L
• C. < 2 mg/L
• D. < 6 mg/L

Answer: (B)

Fluoride in drinking water is regulated with a primary limit called the maximum contaminant level. The enforceable standard is 4 mg/L, set to prevent health risks from long-term exposure while still allowing the beneficial dental effects at lower concentrations. There's also a secondary standard of 2 mg/L used for aesthetic and corrosion concerns, but it’s not a health-based limit. The other numbers aren’t the primary regulatory limit.

Fluoride in drinking water is regulated with a primary limit called the maximum contaminant level. The enforceable standard is 4 mg/L, set to prevent health risks from long-term exposure while still allowing the beneficial dental effects at lower concentrations. There's also a secondary standard of 2 mg/L used for aesthetic and corrosion concerns, but it’s not a health-based limit. The other numbers aren’t the primary regulatory limit.