Nevada County Municipal Code Ch. 3 Regulation of Discharges

Normal discharges into District sewerage system shall be limited to residential, bars, dining facilities, retail stores, offices, schools, and subdivision recreational facilities.

(SD-5. (03/26/1979); Amended by SD-41. (01/08/2002); SD-75. 11/07/2023)

As an exception to Section 30.03.030 of this Chapter, minor industrial discharges may be allowed, provided that they are limited to automatic car washes with water reclaim systems. For purposes of this Section, "Minor Industrial Discharges" shall mean discharges, which do not qualitatively or quantitatively violate the applicable State Waste Discharge Requirements. Written verification from the California Regional Water Quality Control Board with jurisdiction over the zone in which the discharge is proposed, after being fully informed about the proposed operation that the discharge will not violate the applicable requirements, shall be conclusively presumed to satisfy the conditions of this Section as long as the operation is conducted as represented.

(SD-41. (01/08/2002); SD-75. 11/07/2023)

Industrial wastewaters shall not be discharged into District sewerage facilities. This restriction will also apply to future annexations unless allowed by special annexation agreement condition.

Discharges into sewerage systems is prohibited for the following waste types:

A. Any gasoline, benzene, naphtha, solvent, fuel, oil or any liquid, solid or gas that would cause or tend to cause flammable or explosive conditions to result in the sewerage system.

B. Any waste containing toxic or poisonous solids, liquids or gases in such quantities that, alone or in combination with other waste substances, may create a hazard for humans, animals or the local environment, interfere detrimentally with wastewater treatment processes, cause a public nuisance, or cause any hazardous condition to occur in the sewerage system.

C. Any waste having a pH lower than six (6.0) or having any corrosive or detrimental characteristic that may cause injury to wastewater treatment or maintenance personnel or may cause damage to structures, equipment or other physical facilities of the sewerage system.

D. Any solids or viscous substances of such size or in such quantity that they may cause obstruction to flow in the sewer or be detrimental to proper wastewater treatment plant operations. These objectionable substances include, but are not limited to, asphalt, dead animals, offal, ashes, sand, mud, straw, industrial process shavings, metal, glass, rags, feathers, tar, plastics, wood, whole blood, paunch manure, bones, hair and fleshings, entrails, paper dishes, paper cups, milk containers, or other similar paper products, either whole or ground.

E. Any rainwater, stormwater, groundwater, street drainage, subsurface drainage, roof drainage, yard drainage, water from yard fountains, ponds or lawn sprays or any other uncontaminated water.

F. Any water added for the purpose of diluting wastes which would otherwise exceed applicable maximum concentration limitations.

G. Any nonbiodegradable cutting oils, commonly called soluble oil, which form persistent water emulsions.

H. Any excessive concentrations of nonbiodegradable oil, petroleum oil or refined petroleum products.

I. Any dispersed biodegradable oils and fats, such as lard, tallow or vegetable oil in excessive concentrations that would tend to cause adverse effects on the sewerage system.

J. Any waste with an excessively high concentration of cyanide.

K. Any unreasonably large amounts of undissolved or dissolved solids.

L. Any wastes with excessively high BOD, COD or decomposable organic content.

M. Any strongly odorous waste or waste tending to create odors.

N. Any wastes containing over zero and one tenths (0.1) milligram/liter of dissolved sulfides.

O. Any wastes with a pH high enough to cause alkaline incrustations on sewer walls.

P. Any substance promoting or causing the promotion of toxic gases.

Q. Any waste having a temperature of one hundred twenty (120) degrees Fahrenheit or higher.

R. Any wastes requiring an excessive quantity of chlorine or other chemical compound used for disinfection purposes.

S. Any excessive amounts of chlorinated hydrocarbon or organic phosphorus type compounds.

T. Any excessive amounts of deionized water, steam condensate or distilled water.

U. Any waste containing substance that may precipitate, solidify or become viscous at temperatures between fifty (50) degrees Fahrenheit and one hundred (100) degrees Fahrenheit.

V. Any waste producing excessive discoloration of wastewater or treatment plant effluent.

W. Any garbage or waste that is not ground sufficiently to pass through a three-eighths (⅜) inch screen.

X. Any wastes containing excessive quantities of iron, boron, chromium, phenols, plastic resins, copper, nickel, zinc, lead, mercury, cadmium, selenium, arsenic or any other objectionable materials toxic to humans, animals, the local environment or to biological or other wastewater treatment processes.

Y. Any blow-down or bleed water from cooling towers or other evaporative coolers exceeding one-third (⅓) of the makeup water.

Z. Any single pass cooling water.

AA. Any excessive quantities of radioactive material wastes.

BB. Recognizable portions of the human anatomy.

CC. Trucked or hauled pollutants, including waste from a septic tank.

(SD-5. (03/26/1979); SD-52. (01/10/2006); SD-75. 11/07/2023)

All connections to any District sewer system which generate excessive amounts of grease, fat or oil shall install and maintain a grease trap or interceptor as approved by the Chief Building Inspector. A maintenance log shall be kept by the user on the property which shall record the dates of service, quantity of grease removed, who removed it, and where it was disposed. The log shall be available for review by the District. The material removed from the grease trap shall be legally disposed. Each grease trap or interceptor required by this Section shall be sized in accordance with §§ 711 and 712 of the current edition of the Uniform Plumbing Code, as adopted by the Nevada County Building Department, except with written prior approval of the Chief Building Inspector.

(Added by SD-30. (04/11/1995); SD-75. 11/07/2023)