The USGS National Water Quality Program investigates the quality of water pumped from public-supply wells across the United States. These wells are the source of drinking water and water for other household needs for more than one-third of the U.S. population. There are about 140,000 public water...Read more

Intensive studies by the USGS National Water-Quality Assessment (NAWQA) Project in agricultural areas provide insight into how agricultural activities have altered the natural flow of water and the way that agricultural chemicals enter streams and aquifers, and in particular how nutrients affect...Read more

Sediment can be transported as suspended load (moves with the flow of the river) or as bedload (rolls along the riverbed) or can be deposited on the riverbed or bank. Sediment is naturally occurring and essential to supporting the ecological function of a water body. High sediment concentrations in...Read more

Fertile soil, mild weather, and long growing season allow California to produce nearly half of the United States' vegetables, fruits and nuts, and approximately 80% of the world's almonds. The state's agriculture industry is an economic powerhouse, valued at $46.4 billion and...Read more