Answer:frist we are going to know what water regulation is National Primary Drinking Water Regulations (NPDWR) are standards and treatment techniques that public water systems must follow. These regulations protect public health by limiting contaminant levels in drinking water.
MY ASNWER
The 1972 clean water act the reason why I think clean water act had such an impact is that that's what made the clean water regulation made states have a standard level of low pollution before calling it drinking water it separated the different uses of water by the population like what you can swim in and what you can drink
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