Secondary maximum contaminant level (SMCL)

What is Secondary maximum contaminant level (SMCL)?

Secondary maximum contaminant level (SMCL) meaning The maximum contamination level in public water systems that, in the judgment of the U.S. Environmental Protection Agency (USEPA), are required to protect the public welfare. SMCLs are secondary (nonenforceable) drinking water regulations established by the USEPA for contaminants that may adversely affect the odor or appearance of such water.

 

reference: USGS – National Water-Quality Assessment (NAWQA) Project