40 CFR § 438.15
New source performance standards (NSPS)
June 9, 2020
New point sources subject to this subpart must achieve the new source performance standards (NSPS) for TSS, O&G (as HEM), and pH, which are the same as the corresponding limitation specified at §438.12. The performance standards apply with respect to each new point source that commences discharge after June 12, 2003.