The given statement is False.
In the USA, there are too many rivers and some of them are not even accessible. Volunteers do monitor all the major rivers as well as small streams but probably not all rivers. To closely monitor the pollution levels, sampling and analysis of water is done. Water samples are taken from lakes, streams, rivers, etc. and conditions of the waterbody is evaluated. Water quality monitoring can evaluate the chemical, physical, and biological characteristics of a water body in relation to designated water uses, ecological conditions, and human health.
