Any physical, biological, or chemical change in water quality that adversely affects living organisms or makes water unsuitable for desired uses can be considered pollution.
Often, however, a change that adversely affects one organism may be advantageous to another. Conversely, antibiotics designed for use at one site might pose a pollution threat to non-target or beneficial downstream microorganisms and ultimately other life forms.
The U.S. Environmental Protection Agency (EPA) oversees National Primary Drinking Water Regulations (NPDWRs, or primary standards), which are legally enforceable standards regarding water contained in public water systems. Primary standards are intended to promote and protect public health by setting limits for levels of contaminants in drinking water. Agents of pollution or contaminants are divided into categories...Read more