Surface Water Quality
Water quality criteria are U.S. Environmental Protection Agency (EPA) recommended maximum concentrations for pollutants in ambient waters. The values are calculated, using primarily laboratory data, to protect most of the species most of the time, on a national basis. State agencies incorporate EPA’s water quality criteria or other state-approved site-specific criteria into legally enforceable water quality standards.
The oil and natural gas industry practices environmental protection and water conservation as a part of many of their operations. These practices are good for business, of course, but they also help protect and conserve resources. As an example, it is common practice for oil refineries to employ "cogeneration".