The Director is authorized to establish local limits pursuant to 40 CFR 403.5(c).
The following pollutant limits are established to protect against pass through and
interference. Except where more restrictive limitations are imposed by permit or federal
pretreatment standards, no person shall discharge wastewater containing in excess
of the following instantaneous limits:
Pollutant
Maximum Concentration Limitations (mg/L unless noted otherwise)
Ammonia (as N)
250
Arsenic
1.1
Biochemical Oxygen Demand
1,263
Boron
23
Cadmium
0.72
Chemical Oxygen Demand
2,000
Chloride
130
Chromium (Hexavalent)
0.2
Chromium (Total)
10.2
Copper
2.07
Cyanide (Total)
0.08
Lead
4
Mercury
0.044
Methylene Blue Active Substances
161
Molybdenum
400
Nickel
5.3
Oil and Grease (biodegradable living sources)
300
Oil and Grease (non-living sources)
100
pH
6 to 10 units
Selenium
0.0027
Silver
4.1
Sulfate
570
Total Dissolved Solids
1,100
Total Suspended Solids
7,292
Zinc
2.8
The above limits apply at the point where the wastewater is discharged to the POTW.
Local limits shall be enforced by the use of grab samples. All concentrations for
metallic substances are for total metal unless indicated otherwise. The Director may
impose mass-based limitations in addition to the concentration-based limitations above
when necessary to comply with applicable pretreatment standards or pretreatment regulations.
(§ 1, Ord. 1170, eff. April 21, 2011)
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