40 CFR 444.16 - Pretreatment standards for existing sources (PSES).

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§ 444.16 Pretreatment standards for existing sources (PSES).

Except as provided in 40 CFR 403.7 and 403.13, any source that introduces wastewater pollutants into a POTW must comply with part 403 and achieve the following pretreatment standards:

Pretreatment Standards 1

Maximum daily Maximum monthly avg.
Arsenic 84 72
Cadmium 71 26
Chromium 25 14
Copper 23 14
Lead 57 32
Mercury 2.3 1.3
Silver 13 8
Titanium 60 22
Zinc 82 54

1 Micrograms per liter (ppb)

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