Table 4.

Potential solutions for toxic metal and metalloid contamination.

Source	Prevention	Correction
Naturally occurring	Best practices for siting and planning new water sources	Source substitution/blending Treating water
Catchment pollution	Best practices for siting and planning new water sources Preventing and reducing catchment pollution	Correcting existing pollution Source substitution/blending Treating water
Water treatment and distribution	Using appropriate parts and materials Best practices for installation, construction, and maintenance Conditioning water	Replacing, modifying, or cleaning parts Treating water