Small-system toxin removal

摘要

In the United States there are 142,386 public groundwater systems. The US Environmental Protection Agency (EPA) classifies them as community water systems (CWS), non-transient non-community water systems (NTNCWS) or transient non-community water systems (TNCWS).rnThe 40,000 groundwater CWS are public systems serving year-round populations and have an average user population of 2,200.rnThe non-community water systems (NCWS) serve much smaller populations, averaging 300 persons for the 18,000 NTNCWS and 134 persons for the 83,000 TNCWS.rnThese systems typically draw from wells to serve apartments, schools, trailer parks, rest stops and thousands of other applications, some serving commercial or even industrial water users.