A. Non-Toxic Pollutants: The following pollutant limits are established to protect against pass through and interference. No user shall discharge any wastewater containing concentrations greater than the daily maximum local limit as set forth below into any sewers that connect either directly or indirectly to the POTW.
Pollutant | Instantaneous Daily Maximum (mg/l) |
Oil and grease | 200 |
B. Toxic Pollutants: No user shall discharge any wastewater containing concentrations greater than the daily maximum local limits as set forth below into any sewers that connect either directly or indirectly to the POTW.
Pollutant | Surcharge Threshold (mg/l) | Maximum Concentration (mg/l) |
Pollutant | Surcharge Threshold (mg/l) | Maximum Concentration (mg/l) |
Ammonia | 23 | 90 |
Arsenic | - | 0.3 |
BOD | 188 | 650 |
Cadmium | - | 0.4 |
Chromium, Total | - | 4.0 |
Chromium, Hexavalent | - | 0.22 |
COD | 565 | 1700 |
Copper | - | 1.0 |
Cyanide | - | 0.2 |
Hydrogen Sulfide (volatile) | - | 10 |
Hydrogen Sulfide (water) | - | 0.5 |
Lead | - | 3.0 |
Mercury | - | 0.0005 |
Nickel | - | 5.0 |
pH | - | See section 7-3A-12.C.5 |
Phosphorus | - | 23 |
Radium (226 + 228) (pCi/L) | - | 5.0 |
Silver | - | 3.5 |
Selenium | - | 1.5 |
TSS | 213 | 533 |
Zinc | - | 2.0 |
C. FSE Twenty-Five Percent (25%) Requirement: The village may apply the twenty-five percent (25%) requirement at the discharge side of the external grease interceptor (GI) prior to mixing with any other wastewater from the contributing FSE’s property in lieu of the limits listed in section 7-3A-13.A above if a representative sample cannot be obtained. The last section of an external GI at an FSE shall be measured to determine that the total volume of the GI being used for any food-derived solids to settle or accumulate plus the floatable grease- derived materials that rise and accumulate, identified as a solids blanket and grease cap respectively, is less than twenty-five percent (25%) of the total design hydraulic depth as measured from the effluent discharge pipe to the bottom (“twenty-five percent (25%) requirement”). The village may also apply the twenty-five percent (25%) requirement for external GI that are used in non-FSE locations such as an automobile service, repair and dispensing properties.
D. The village will apply the local limits found in sections 7-3A-13.A and B. above normally at the end-of-pipe point where the non-residential waste is discharged to the municipal sewer system.
E. The village reserves the right to establish requirements, by ordinance or in a wastewater discharge permit or general permit, to require control over the quantities and rates of discharge from any user.
F. The village reserves the right to establish, by ordinance or in a wastewater discharge permit, mass limitations rather than concentration limitations on discharges particularly if users are using dilution to meet applicable pretreatment standards or requirements, or in other cases when the imposition of mass limitations is appropriate.
G. The village reserves the right to set specific limits for those pollutants not identified in sections 7-3A-13.A and B. on a case by case basis for impacts caused to the treatment works including but not limited to interference, potential problems, pass through and prevention of beneficial sludge re-use. Those limits shall be set forth in a wastewater discharge permit per section 7-3A-23.
1. Local limits for additional pollutants not identified in sections 7-3A-13.A. or B. will be noticed to the permit holder a minimum of thirty (30) days prior to the effective date of the wastewater discharge permit or within thirty (30) days of notifying the village of additional pollutants if a permit has already been issued. In the event that the village receives written comment on said limit during the comment period, the limit will take effect within sixty (60) days of the public notice date to allow review and comment by the village.
H. The village may develop best management practices (BMPs), by ordinance or in individual wastewater discharge permits or general permits, to implement local limits and the requirements of section 7-3A-12.
I. Any user whose discharge may be pretreated and/or treated more effectively by the village, and discharges to the village’s POTW that cause the village to alter its method of wastewater treatment or sludge disposal to a more costly method shall be assessed the differential cost between the more costly method of treatment and the less costly method of treatment. Such costs shall only be assessed upon approval of the village board.
J. The village reserves the right to establish, by ordinance or in wastewater discharge permits or general permits, more stringent limitations or requirements on discharges to the POTW consistent with the purpose of this chapter. The specific limitations on discharge listed in section 7-3A-13B. are derived from the maximum allowable industrial loading (MAIL) calculation. The MAILSs are allocated only to those IUs, at the village’s discretion, that contribute the regulated pollutant and all remaining IUs are held to either the background concentration or slightly higher than background but lower than the specific discharge limit. In no case shall the total of all allocations exceed the MAIL.
K. The village will maintain a reserve of the maximum allowable headworks pollutant loading for each pollutant for new industries or increase with existing industries. The village will recalculate the maximum concentrations from time to time using site specific data taking into consideration revisions to state and federal regulations that may impact the calculations. (Ord. 2005-10, 3-15-2005; amd. Ord. 2011-18, 6-28-2011; Ord. 2015-08, 1-27-2015; Ord. 2021-08, 4-27-2021)