40 CFR § 420.08
Non-process wastewater and storm water
June 9, 2020
Permit and pretreatment control authorities may provide for increased loadings for non-process wastewaters defined at §420.02 and for storm water from the immediate process area in NPDES permits and pretreatment control mechanisms using best professional judgment, but only to the extent such non-process wastewaters result in an increased flow.
[67 FR 64261, Oct. 17, 2002]