CHAPTER 19. WASTEWATER DISCHARGE AND TREATMENT.
Article II. Discharge Requirements.
Sec. 19-2-1. General discharge prohibitions.
(a) It is unlawful for any user to discharge, contribute, or cause to be
contributed, directly or indirectly, any pollutant, or wastewater at any flow
rate or concentration which will cause interference with the operation or
performance of the WPCF or which would cause the WPCF to be in violation of its
NPDES permit. These general prohibitions apply to all users of the WPCF whether
or not the user is subject to pretreatment standards or any other national,
state or local pretreatment requirements.
(b) It is unlawful for any user to
discharge the following substances to the WPCF:
(1) Chlorine Demand. Any
wastewater requiring an excessive quantity of chlorine or other chemical
compound used for disinfection purposes.
(2) Corrosive Substances. Any
wastewater having a pH lower than 5.0 or having any other corrosive property
capable of causing damage or hazard to structures, equipment or personnel of the
(3) Dilution Water. Any water added to wastewater for the purpose of
diluting wastes which would otherwise exceed applicable maximum concentration
(4) Discoloration. Any wastewater with objectionable color not
removed in the treatment process, such as, but not limited to, dye wastes and
vegetable tanning solutions.
(5) Flammable or Explosive Substances. Any
liquids, solids or gases which by reason of the nature or quantity are, or may
be, sufficient either alone or by interaction with other substances, to cause
fire or explosion, or be injurious in any other way to the WPCF or to the
operation of the WPCF, or which exceed a flashpoint limit of one hundred forty
degrees F or sixty degrees C (using the test methods specified in 40 CFR
261.21). At no time shall two successive readings on an explosion hazard meter,
at the point of discharge into the sewage system (or at any point in the sewage
system), be more than five percent nor any single reading over ten percent of
the lower explosive limit (LEL) of the meter. Prohibited materials include, but
are not limited to: gasoline, kerosene, naphtha, benzene, toluene, xylene,
ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates,
bromates, carbides, hydrides and sulfides and any other substances in any
quantity or concentration that the city, the state or the EPA has notified the
user is a fire hazard or a hazard to the WPCF.
(6) Insecticides. Any
wastewater containing algaecides, fungicides, antibiotics, insecticides, strong
oxidizing agents or strong reducing agents in such quantity or strength as to
cause or contribute to violations of the WPCF's NPDES discharge restrictions,
interference with or upset of the WPCF, or personnel safety
(7) Medical Waste. Any wastewater containing medical wastes
including, but not limited to, isolation wastes, infectious agents, human blood
and blood products, pathological wastes, sharps, body parts, contaminated
bedding, surgical wastes, potentially contaminated laboratory wastes, or
dialysis wastes except as specifically authorized by the director in a
wastewater discharge permit.
(8) Noxious or Malodorous Substances. Any
noxious or malodorous liquids, gases, or solids which either singly or by
interaction with other wastes are sufficient to create a public nuisance or
hazard to life, or are sufficient to prevent entry into the WPCF for maintenance
(9) Pollutants and BOD. Any wastewater containing pollutants,
including oxygen demanding pollutants (BOD, etc.), wastes containing suspended
solids, or exerting a chlorine demand released at a flow rate and/or pollutant
contamination which will cause interference to the WPCF, or which will cause or
contribute significantly to violations of the WPCF NPDES limits.
Discharges. Any slug discharge having a flow rate, or containing concentrations
or quantities of pollutants which will (1) cause interference with the operation
or performance of the WPCF; or (2) exceed for any time period longer than
fifteen minutes, more than five times the average twenty-four-hour
concentration, quantity or flow during normal user operations.
Nuisance. Any wastewater that causes a hazard to human life or creates a public
(12) Radioactive Wastes. Any wastewater containing radioactive
wastes or isotopes of such half-life or concentration as may exceed limits
established by the director in compliance with any applicable state or federal
(13) Solids or Viscous Matter. Any solid or viscous substances
which may cause obstruction to the flow in a sewer or other interference with
the operation of the WPCF such as but not limited to: grease or fat, garbage
with particles greater than one-half inch in any dimension, animal guts or
tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood,
feathers, ashes, cinders, sand, spent lime, stone or marble dust, metal, glass,
straw, shavings, grass clippings, rags, spent grains, spent hops, wastepaper,
wood, plastics, gas, tar, asphalt residues, residues from refining, or
processing of fuel or lubricating oil, mud, or glass grinding or polishing
(14) Storm and Cooling Water. Any rainwater, stormwater,
groundwater, street drainage, subsurface drainage, yard drainage, including
evaporative type air cooler discharge water and noncontact cooling
(15) Sulfides. Any wastewater containing sulfides in sufficient
quantity or strength as to cause or contribute to WPCF corrosion, worker or
public safety hazard, interference or upset of the WPCF, or violations of the
WPCF's NPDES permit.
(16) Temperature. Any liquid, vapor, solid, gas,
wastewater or substance having or developing a temperature which will inhibit
biological activity in the WPCF resulting in interference; but, in no case,
wastewater with a temperature, at introduction into the WPCF, which exceeds one
hundred four degrees F (forty degrees C).
(17) Toxic Substances. Any
wastewater containing toxic pollutants, gases, vapors, or fumes in sufficient
quantity, either singly or by interaction with other pollutants, which may
injure or interfere with any wastewater treatment process, cause acute worker
health and safety problems, constitute a hazard to humans or animals, create a
toxic effect in the receiving waters of the WPCF, result in exceedances of
sludge disposal restrictions, or exceed the limitation set forth in a
pretreatment standard or pretreatment regulation. A toxic pollutant shall
include, but not be limited to, any pollutant identified pursuant to Section
307(a) of the Act.
(18) Trucked/Hauled Wastes. The discharge of hauled or
trucked pollutants, except at points which the director shall designate in
accordance with Section 19-3-3, or as permitted by the director as part of the
elimination or decommissioning of a septic tank within the city.
Unsuitable Wastes. Any substance which my cause the WPCF's effluent, or any
other product of the WPCF such as residues, sludges or scums, to be unsuitable
for reclamation and reuse or which may interfere with the reclamation process.
In no case shall a substance discharged to the WPCF cause the WPCF to be in
noncompliance with sludge use or disposal criteria, guidelines or regulations
developed under federal law, including, but not limited to, Section 405 of the
Act, any criteria, guidelines or regulations affecting sludge use or disposal
developed pursuant to the Solid Waste Disposal Act (42 USC Section 6901 et
seq.), the Clean Air Act (42 USC Section 7401 et seq.), the Toxic Substances
Control Act (15 USC Section 2601 et seq.) or state criteria applicable to the
sludge management method being used.
(20) Pass Through Substances. Any
substance or discharge which will pass through the WPCF in quantities or
concentrations that, alone or with discharges from other sources, may cause a
violation of the WPCF's NPDES permit or the receiving water quality
(21) Petroleum. Any petroleum oil, any nonbiodegradable cutting
oil, or any amounts of products of mineral oil origin which may cause
interference or pass through. (Ord. No. 1271, § 1 (part); Ord. No. 1286,