alleryStart learning →What maximum safe level of fluoride ion in tap water has the EPA identified?
A4 ppb
B15 ppb
C40 ppm
D4 ppm
Answer & Solution
Correct answer: D. 4 ppm
1. Trace contaminants in water are commonly reported in ppm or ppb.
2. The EPA has set the maximum safe level of fluoride ion in tap water at 4 ppm.
3. Inline water filters are built to bring fluoride and other trace contaminants below such limits.
4. The figure 15 ppb is the lead level that triggers remedial action, a different contaminant and a different unit.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.4 Other Units for Solution Concentrations_
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