The Fluoridation of Water Act was brought forward to promote public health, but it's actually a detriment to public health as a whole. The argument to include it in the water supply is to reduce the prevalence of cavities, although
there has been a worldwide trend in less dental decay over time, including in locations that don't mandate the practice. The most common effect of water fluoridation seen is dental fluorosis, which is often harmless, but there are other adverse effects to the body that comes with exposure to fluoride. Fluoride accumulates in the body over time and damages the brain, bones, kidneys, and does other things as well.
The EPA lists fluoride as a known toxin with substantial evidence, meaning that it is toxic for humans and animals no matter the concentration.
This webpage covers many reasons why we shouldn't keep doing this practice that I haven't covered here.
This legislation I'm proposing repeals the law that we currently have, which mandates fluoridation across the Mideast. I'm not advocating for a ban on fluoridation outright, however. If municipalities wish to add the substance in their water supplies, then they should make that decision by themselves. It's bad public policy for the Mideast government to enforce this throughout the whole region, though, primarily for health reasons.