The standards for new sources may be more stringent than that for existing facilities, on the principle that a new plant can be designed with the latest and most advanced control technologies.
[1]: 82–83 The Clean Air Act NSPS dictate the level of pollution that a new stationary source may produce.
Examples: Under the Clean Water Act, NSPS set the level of allowable wastewater discharges from new industrial facilities.
EPA issues NSPS for categories of industrial dischargers, typically in conjunction with the issuance of effluent guidelines for existing sources.
In developing NSPS, the CWA requires that EPA determine the "best available demonstrated control technology" (BADCT) for the particular industrial category.