Chapter 13.18


13.18.010    Sanitary sewer – Prohibited discharges.

13.18.020    Unpolluted drainage and process waters – Discharge – Approval required.

13.18.030    Prohibited discharges.

13.18.040    Federal categorical pretreatment standards.

13.18.050    State requirements.

13.18.060    Preliminary treatment facilities – Installation when – Approval required.

13.18.070    Maintenance by owner.

13.18.080    City may treat industrial waste.

13.18.090    Industry.

13.18.010 Sanitary sewer – Prohibited discharges.

No person shall discharge or cause to be discharged any stormwater, surface water, groundwater, roof runoff, subsurface drainage, cooling water or unpolluted industrial process waters to any sanitary sewer. [Ord. 16-03 § 1, 2003].

13.18.020 Unpolluted drainage and process waters – Discharge – Approval required.

Stormwater and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as combined sewers or storm sewers, or to a natural outlet approved by the city engineer. Industrial cooling water or unpolluted process water may be discharged, upon approval of the city engineer, to a storm sewer, combined sewer or natural outlet. [Ord. 16-03 § 1, 2003].

13.18.030 Prohibited discharges.

No user shall introduce or cause to be introduced in the public sewage system any pollutant or wastewater which causes pass through or interference. These general prohibitions apply to all users of the public sewage system whether or not they are subject to categorical pretreatment standards or any other national, state, or local pretreatment standards or requirements. Except as hereinafter provided, no person shall discharge or cause to be discharged any of the following described wastes or wastewater to the public sewer system or natural outlet:

A. Liquid or vapor having temperatures higher than 110 degrees Fahrenheit.

B. Wastewater having a temperature which will inhibit biological activity in the treatment plant resulting in interference.

C. Wastewater which contains more than 25 parts per million weight of fat, oil, or grease.

D. Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass through.

E. Flammables capable of causing explosion or supporting combustion in the public sewer system, including but not limited to the following: gasoline, benzene, naphtha, cleaning solvent, kerosene, fuel oil, waste crankcase oil, acetylene generation sludge, and painting materials.

F. Garbage that has not been properly shredded to three-eighths inch in diameter or less.

G. Ashes, cinders, sand, mud, straw, hair, shavings, metal, glass, rags, feathers, tar, plastics, sea shells, wood, paunch manure, or any other solid or viscous substance capable of causing obstruction to the flow of sewers or other interference with the proper operation of the public sewer system.

H. Wastewater having a pH lower than five and one-half or having the capacity to cause damage or hazards to structures, equipment or personnel of the public sewer system.

I. Wastewater having a pH in excess of nine.

J. Wastewater containing any toxic or poisonous substance, including chlorinated hydrocarbons, in sufficient quantity to injure or interfere with any sewage treatment process, or constitute a hazard to man or environment.

K. Wastewater containing BOD or suspended solids of such character and quantity that unusual attention or expense is required to handle such materials in collections systems, in the interceptors, at the sewage treatment plant, or at pumping stations.

L. Noxious or malodorous gas or substance capable of creating a public nuisance or to prevent entry into the sewers for maintenance or repair.

M. Wastewater with unusual BOD, chemical oxygen demand, chlorine requirements, volume of flow, or concentration of wastes constituting slugs.

N. Wastewater containing substances which are not amenable to treatment or reduction by the sewage treatment processes currently employed, or that are amenable to incomplete treatment such that the sewage treatment plant effluent cannot meet the requirements of state or federal agencies having jurisdiction over discharges to receiving waters.

O. 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 city’s NPDES permit.

P. Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the state or federal agencies having jurisdiction over discharges to receiving waters.

Q. Any waters or wastes containing iron, chromium, copper, zinc, and similar objectionable or toxic substance to such degree that any such material received in the composite wastewater at the wastewater treatment plant exceeds the limits established by the state or federal agencies having jurisdiction over discharges to receiving waters.

R. Stormwater, surface water, groundwater, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, noncontact cooling water and unpolluted wastewater, unless specifically authorized by the city engineer.

S. Any sludges, screenings, or other residues from the pretreatment of industrial wastes or from industrial processes.

T. Medical wastes, except as specifically authorized by the city engineer.

U. Detergents, surface-active agents, or other substances which may cause excessive foaming in the wastewater treatment plant.

V. Grease, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dusts, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood plastics, gas, tar asphalt residues, residues from refining or processing of fuel or lubricating oil, mud or glass grinding or polishing wastes.

W. Any wastewater, which in the opinion of the city engineer can cause harm either to sewers, sewage treatment process, or equipment; have an adverse effect on the receiving stream; or can otherwise endanger life, limb, public property, or constitute a nuisance.

X. The contents of any tank or other vessel owned or used by any person in the business of collecting of pumping sewage, effluent, septage, or other wastewater.

Y. Any hazardous wastes as defined in rules published by the state of Washington or in IPA rules 40 CFR Part 261.

Z. Persistent pesticides and/or pesticides regulated by the Federal Insecticide Fungicide Rodenticide Act. [Ord. 16-03 § 1, 2003].

13.18.040 Federal categorical pretreatment standards.

The national categorical pretreatment standards found in 40 CFR Chapter I, Subchapter N, Parts 405 through 471 are hereby incorporated. [Ord. 16-03 § 1, 2003].

13.18.050 State requirements.

State requirements and limitations on discharges to the wastewater treatment plant shall be met by all users which are subject to such standards in any instance in which they are more stringent than federal requirements and limitations, or those herein. [Ord. 16-03 § 1, 2003].

13.18.060 Preliminary treatment facilities – Installation when – Approval required.

A. The admission into the public sewers of any waters or wastes having:

1. A five-day biochemical oxygen demand greater than 300 parts per million by weight.

2. Containing more than 350 parts per million by weight of suspended solids.

3. Containing any quantity of substances having the characteristics described in WRMC 13.18.030.

4. Having an average daily flow greater than two percent of the average daily sewage flow of the city; shall be subject to the review and approval of the city engineer.

B. Where necessary, in the opinion of the city engineer, the owner, at his expense, shall provide such preliminary treatment as may be necessary to:

1. Reduce the biochemical oxygen demand to 300 parts per million and the suspended solids to 350 parts per million by weight.

2. Reduce objectionable characteristics or constituents to within the maximum limits provided for in WRMC 13.18.030.

3. Control the quantities and rates of discharge of such waters or wastes.

C. The city engineer shall determine whether such equipment shall be allowed or required to be installed, and whether the effluent produced is satisfactory.

D. Plans, specifications, and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the city engineer, Washington State Department of Ecology and of the health department of the state, and no construction of such facilities shall be commenced until the approvals are obtained in writing. [Ord. 37-06 § 1, 2006; Ord. 16-03 § 1, 2003].

13.18.070 Maintenance by owner.

Where preliminary treatment facilities are provided for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation, by the owner at his expense. [Ord. 16-03 § 1, 2003].

13.18.080 City may treat industrial waste.

No statement contained in this chapter shall be construed as preventing any special agreement or arrangements between the city and any industrial establishment whereby an industrial waste of unusual strength of character may be accepted by the city for treatment to be paid for by the industrial concern. [Ord. 16-03 § 1, 2003].

13.18.090 Industry.

If any property is served by a side sewer carrying nondomestic strength sewage, the owner or occupant shall install a control manhole (see Chapter 13.20 WRMC). Where required (in the opinion of the city engineer to modify or eliminate wastes that are harmful to the structures, sewers, processes or operation of the sewage treatment plant), the person shall provide at his expense such pretreatment or processing facilities as may be determined to be required to render his wastes acceptable for admission to the public sewer system. When the pollution in wastewater exceeds the quality limits of normal domestic sewage, surcharge user charge in addition to the normal user charge may be levied by the public works director in accord with regulations published in the federal register in lieu of pretreatment. [Ord. 37-06 § 1, 2006; Ord. 16-03 § 1, 2003].