If something is toxic, you probably don’t want it in your water. So why does the government allow small levels of potentially harmful chemicals in water?
Currently, the EPA has in place unenforceable water quality goals (MCLG’s) and enforceable drinking water standards (MCL’s). So, what does MCLG stand for? It means the concentration of a contaminant that does not pose any known health risk to humans.
MCLG’s and MCL’s are established with the best of intentions: to monitor and regulate water pollution effects in order to keep you safe and healthy. However, the frequent discrepancy between the guideline (MCLG) and the enforceable standard (MCL) indicates that other factors play a significant role. The legal goals and limits set are most times determined by economic and political factors in order to reduce costs.
Science and new technologies improve our understanding of effects of contaminated water on human health, so contaminant level standards may evolve; but implementing regulations to protect people from chemicals in water takes a longer time. So, chemicals in water may be classified under MCLG deemed “safe”; however, new science may show different in the future.
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