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USD DISCHARGE LIMITS
Pretreatment Ordinance #36 Limitations
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Ordinance No. 36, Section 2:
No person shall discharge wastes into
the sanitary sewer which exceed the following limitations on wastewater
strength:
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Symbols
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Parameter
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Limit for any 1 Sample
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Arsenic
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0.35
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mg/L
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Cd
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Cadmium
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0.2
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mg/L
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Cu
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Copper
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2.0
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mg/L
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CN
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Cyanide
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0.65
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mg/L
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Pb
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Lead
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1.0
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mg/L
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Hg
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Mercury
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0.01
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mg/L
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Ni
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Nickel
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1.0
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mg/L
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Ag
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Silver
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0.5
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mg/L
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Cr
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Total Chromium
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2.0
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mg/L
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Zn
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Zinc
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3.0
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mg/L
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pH
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Between 6.0 and 12.0 units
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Temperature
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No higher than 150o F
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Oil and Grease (Mineral)
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100
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mg/L
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Oil and Grease (Animal or Vegetable)
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mg/L
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TTO
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Total Toxic Organics
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2.13
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mg/L
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CH2O
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Formaldehyde
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mg/L
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C6H6O
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c
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5.0
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mg/L
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Prohibited Wastes Include:
1. Flammable or explosive substances
2. Highly toxic and poisonous substances
3. Substances that may obstruct flow
4. Strongly odorous wastes
5. Uncontaminated water (such as one-pass cooling water, storm water runoff,
etc.)
6. Sludges
7. Wastes with temperatures over 150o F
8. Most radioactive wastes (in excess of State Guidelines)
9. Wastes that contain or result in the production of toxic, corrosive,
explosive, or malodorous gases 10. Organic solvents (including halogenated
solvents) in excess of TTO limits. Consult Ordinance 36 for specific constituents.
For a complete list of prohibited wastes, see
District Ordinance No. 36.
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