(A) General prohibitions. No user shall introduce or cause to be introduced into the POTW any pollutant or wastewater which causes pass-through or interference. These general prohibitions apply to all users of the POTW, whether or not they are subject to categorical pretreatment standards or any other national, state or local pretreatment standards or requirements.
(B) Specific prohibitions.
(1) No user shall introduce or cause to be introduced into the POTW the following pollutants, substances or wastewater:
(a) Pollutants which create a fire or explosive hazard in the POTW, including, but not limited to, waste streams with a closed-cup flashpoint of less than 140°F (60°C) using the test methods specified in 40 C.F.R. § 261.21;
(b) Wastewater having a pH less than 6.0 or more than 10.0, or otherwise causing corrosive structural damage to the POTW or equipment;
(c) Solid or viscous substances in amounts which will cause obstruction of the flow in the POTW resulting in interference, but in no case solids greater than one-half inch in any dimension;
(d) Pollutants, including oxygen-demanding pollutants (BOD and the like), released in a discharge at a flow rate and/or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW;
(e) Wastewater having a temperature greater than 150°F (65°C) or which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the treatment plant to exceed 104°F (40°C);
(f) Petroleum oil, nonbiodegradable cutting oil or products of mineral oil origin in amounts that will cause interference or pass-through;
(g) Pollutants which result in the presence of toxic gases, vapors or fumes within the POTW in a quantity that may cause acute worker health and safety problems;
(h) Trucked or hauled pollutants, except at discharge points designated by the Superintendent. Discharge is subject to the costs shown in § 53.148 of this chapter;
(i) Noxious or malodorous liquids, gases, solids or other wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance or a hazard to life, or to prevent entry into the sewers for maintenance or repair;
(j) Wastewater which imparts color which cannot be removed by the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions, which consequently imparts color to the treatment plant’s effluent, thereby violating the town’s NPDES permit;
(k) Wastewater containing any radioactive wastes or isotopes, except in compliance with applicable state or federal regulations;
(l) Stormwater, surface water, groundwater, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, non-contact cooling water and unpolluted wastewater, unless specifically authorized by the Superintendent;
(m) Sludges, screenings or other residues from the pretreatment of industrial wastes;
(n) Wastewater causing, alone or in conjunction with other sources, the treatment plant’s effluent to fail a toxicity test;
(o) Detergents, surface-active agents or other substances that might cause excessive foaming in the POTW;
(p) Fats, oils or greases of animal or vegetable origin in concentrations greater than 100 milligrams per liter;
(q) Any residuals defined as hazardous waste under 40 C.F.R. part 261; or
(r) Any PCBs unless generated by a controlled waste manufacturing process as defined in 40 C.F.R. § 761.3(kk), in which case, the limit shall be 0.1 milligrams per liter.
(2) Pollutants, substances or wastewater prohibited by this section shall not be processed or stored in such a manner that they could be discharged to the POTW.
(C) Local limits.
(1) The Control Authority is authorized to establish local limits pursuant to 40 C.F.R. § 403.5(c).
(2) (a) The following pollutant limits are established to protect against pass-through and interference. No person shall discharge wastewater containing in excess of the following daily maximum concentration.
Pollutant
|
Limit
|
Pollutant
|
Limit
|
Ammonia | 50 mg/L |
BOD5 | 1,000 mg/L |
Cadmium | 1.0 mg/L |
Chromium (hexavalent) | 1.0 mg/L |
Chromium (total hexavalent plus total trivalent) | 3.0 mg/L |
Copper | 0.84 mg/L |
Cyanide (total by distillation) | 1.2 mg/L |
Lead | 0.4 mg/L |
Mercury | 0.001 mg/L |
Nickel | 2.4 mg/L |
pH | 6.0 – 10.0 |
Silver | 0.24 mg/L |
Total oil and/or grease (animal or vegetable in origin) | 200 mg/L |
Total oil and/or grease (mineral or petroleum in origin) | 100 mg/L |
Total phenols | 1.0 mg/L |
Total phosphorus | 2.5 mg/L |
Total suspended solids | 1,000 mg/L |
Total toxic organics (TTO) | 2.13 mg/L |
Zinc | 2.4 mg/L |
(b) The above limits apply at the point where the wastewater is discharged to the POTW. All concentrations for metallic substances are for total metal unless indicated otherwise. The Control Authority may impose mass limitations in addition to the concentration-based limitations above. Concentrations above 150 milligrams per liter of BOD5 or total suspended solids, or above 20 milligrams per liter for ammonia, are subject to surcharge fees as defined in § 53.140 of this chapter.
(3) The Control Authority may develop best management practices (BMPs), by ordinance or in individual wastewater discharge permits, to implement local limits and the requirements of § 54.020 of this code.
(Ord. 7-2010, passed 11-22-2010; Ord. 3-2019, passed 8-12-2019; Ord. 10-2021, passed 8-9-2021) Penalty, see § 53.999