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No user shall discharge wastewater containing materials in concentrations that exceed the following maximum allowable discharge limits: set forth in the City’s NPDES permit as it now reads or is hereafter amended. Said permit shall be on file at Snohomish City Hall and shall be available for review during normal business hours.

A. High Strength Wastes. Users of any waters or wastes containing higher than ordinary concentrations of compatible pollutants, including, but not limited to, oxygen demanding pollutants and suspended solids (ordinary concentrations are defined as three hundred (300) mg/L for five (5) day BOD and suspended solids, two hundred (200) mg/L of FOG) may be required to discharge at a specific release rate or at a specified strength if, in the opinion of the City, the release of such waste in an uncontrolled manner could adversely affect the POTW.

B. Fats, Oils, and Greases (FOG). No user shall discharge water or wastes containing in excess of one hundred (100) mg/L (maximum level) of FOG of animal or vegetable origin, or fifty (50) mg/L (maximum level) of petroleum products, cutting oil, or mineral products of mineral oil origin whether or not emulsified.

C. Dilution. No user shall increase the use of potable or process water in any way, or combine separate waste streams, or in any way attempt to dilute a discharge, as a partial or complete substitute for adequate treatment to achieve compliance with an applicable pretreatment standard or requirement. The City may request the DOE to impose mass limitations on users that it believes may be using dilution to meet applicable pretreatment standards or requirements, or in other cases when the imposition of mass limitations is appropriate. (Ord. 2351, 2018)

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