40 CFR 466.01 – Applicability
(a) Except as provided in paragraphs (b) and (c) of this section, the provisions of this part apply to any porcelain enameling facility which discharges pollutants to waters of the United States or introduces pollutants into a publicly owned treatment works.
(b) Any existing porcelain enameling facility which prepares or coats less than 1600 m
(c) This part does not apply to the porcelain enameling on precious metal basis material.
(d) When wastewaters from coating cast iron are cotreated with wastewaters from coating steel, the limitations for coating steel contained in § 466.11 may be applied to the entire wastestream.