Similarly, phosphate, a compound found in some cleaning products, was discovered to be one of the major water pollutants lethal to marine life.

Other pollutants have been more difficult to track, especially water pollutants.

The quality of the physical environment has also improved, as levels of major air and water pollutants have dropped since 1970.

Most water pollutants are eventually carried by rivers into the oceans.

There are several classes of water pollutants that may be arrested with bioswales.

These standards specify maximum concentrations for specific water pollutants.

Some water pollutants, especially chlorinated organic compounds, can be destroyed sonochemically.

Currently, 40 kinds of organic materials, including copper, lead, nickel, and cyanogens, are designated as water pollutants.

In addition, the portion that is not used as animal feed or for other beneficial purposes is considered a water pollutant.