No person shall connect a leader from the roof or a surface drain for rainwater to a lateral sewer. No person shall permit surface or subsurface drainage, rainwater, stormwater or seepage to enter a lateral sewer by any device or method and no septic tank may be connected to a lateral sewer.
(Ord. 28, 1966; Ord. 318-01)
A waste substance other than domestic sewage may be deposited in the Town's sewer system only on the following conditions:
A. 
If the Town finds that the waste will not harm the system; and
B. 
The waste is disposed into the Town's system at a designated point.
(Ord. 28, 1966; Ord. 318-01)
No person may discharge any of the following-described waters or waste into a public sewer:
A. 
Liquid or vapor having a temperature higher than 150° Fahrenheit;
B. 
Water or waste which may contain more than 300 parts per million, by weight, of fat, oil or grease;
C. 
Gasoline, benzene, naphtha, fuel oil or other flammable or explosive liquid, solid or gas;
D. 
Ashes, cinders, sand, mud, straw, metal, glass, rags, feathers, tar, hair, plastics, wood, manure, garbage that has not been properly shredded, or other solid or viscous substance capable of causing obstruction to the flow of sewers or other interference with the proper operation of the sewerage system;
E. 
Water or waste having any corrosive property capable of causing damage or hazard to structures, equipment and personnel of the sewage system;
F. 
Water or waste containing a toxic or poisonous substance in sufficient quantity to injure or interfere with the sewage treatment process, or which is a hazard to humans or animals, or creates a hazard in the receiving waters of the sewage treatment plant;
G. 
Water or waste containing suspended solids of such character and quantity that unusual attention or expense is required to handle the material at the sewage treatment plant;
H. 
Noxious or malodorous gas or substance capable of creating a public nuisance;
I. 
Solid, semi-solid or liquid substance resulting from industrial manufacturing or commercial process or from a garage, service station or vehicle wash rack; and
J. 
Any waste or substance prohibited under State or Federal law.
(Ord. 28, 1966; Ord. 318-01)
A. 
All restaurants and food preparation businesses which are required to obtain a use permit after the effective date of this section shall install and maintain in good operating condition at all times a grease trap or grease interceptor and sampling manhole or box acceptable to the Town sufficient to process all wastewater containing grease or oil produced or occurring on the premises. Installation of the required grease trap or grease interceptor and sampling manhole or box shall be completed prior to opening for business.
B. 
All restaurants and food preparation businesses existing on the effective date of the ordinance codified in this section shall install and maintain in good operating condition a sampling manhole or box on the discharge side of existing grease traps or grease interceptors or provide some other point of sampling acceptable to the Town. Installation of the required sampling manhole or box shall be completed within 180 days of the effective date of the ordinance codified in this section.
C. 
All restaurants and food preparation businesses existing on the effective date of this section producing discharges of wastewater that exceed the limitations of Section 13.56.030(B) three times or more within a 12-month period shall install and maintain in good operating condition at all times a grease trap or grease interceptor acceptable to the Town sufficient to process all wastewater containing grease or oil produced or occurring on the premises.
D. 
The following activities and/or equipment is prohibited in all restaurants and food preparation businesses:
1. 
The use of enzymes or bacterial cultures designed to disperse grease or fat;
2. 
The connection of high volume hot water or steam dishwashers to grease interceptors;
3. 
The installation and use of garbage grinders (disposals).
E. 
Notwithstanding subsections A, B, and C, the Town may require a grease, oil or sand interceptor if it finds that it is necessary in order to properly handle liquid waste containing grease in an excessive amount, or a flammable waste, sand or other ingredient which might be harmful to the system. However, no interceptor is necessary for a building used solely as a residential structure.
F. 
All restaurants and food preparation businesses shall obtain a wastewater discharge permit from the Town within 180 days of the effective date of this section, and every five years thereafter, and pay a fee set by resolution of the Council.
G. 
All grease traps or grease interceptors installed and maintained pursuant to this section shall conform to the approved designs and specifications maintained on file by the Public Works Director or shall conform to the Uniform Plumbing Code and be approved in design and specifications by the Public Works Director or his or her designee.
H. 
All parties with a grease trap or grease interceptor shall process all wastewater containing grease or oil through such grease trap or grease interceptor prior to any discharge thereof into the Town sewer. All such parties shall maintain the same in good operating condition and shall clean and dispose of the accumulated waste as frequently as is necessary to maintain proper operating conditions. None of the waste materials cleaned from any such grease trap or grease interceptor shall be disposed of into any Town storm drain or sewer manhole nor in any other manner which constitutes a public or private nuisance.
I. 
The Town's Public Works Director, designee or any Napa County Environmental Management personnel acting under his or her directions may enter any restaurant or food preparation business premises where any grease trap, grease interceptor, sampling manhole or box or other point of sampling is required to be maintained to inspect such devices periodically or whenever deemed necessary to ascertain whether all requirements of this section are being complied with.
J. 
The first violation of this section or Section 13.56.030 shall constitute an infraction; subsequent violations may, at the discretion of the enforcing officer, be charged and prosecuted as a misdemeanor. In addition, after three or more violations the enforcing officer may order the business to cease operations until the violations are corrected.
(Ord. 318-01)
Notwithstanding the prohibitions in Section 13.56.030, the discharge into a public sewer of the following water or waste may be approved by the Town Engineer for good cause:
A. 
Water or waste having a five-day biochemical oxygen demand greater than 300 parts per million by weight, or containing more than 350 parts per million by weight of suspended solids;
B. 
Water or waste having any of the characteristics described in Section 13.56.030;
C. 
Water or waste having an average daily flow of greater than two percent of the average daily sewage flow of the Town.
(Ord. 28, 1966; Ord. 318-01)
If the Town finds that waste may be injurious to the sewer system, the Town may require pretreatment sufficient to neutralize or remove injurious elements as a condition to connection or discharge.
(Ord. 28, 1966; Ord. 318-01)
A. 
The Town may require the owner of property served by a building sewer carrying industrial waste to install a suitable control manhole in the lateral sewer to facilitate observation, sampling and measurement of the waste. The manhole shall be accessibly and safely located and shall be constructed in accordance with plans approved by the Supervisor. The owner shall maintain the manhole at his or her expense and shall keep it in a safe and accessible condition.
B. 
The measurement, test and analysis of the characteristics of water and waste shall be determined at the control manhole. If no special manhole is required, the control manhole shall be considered to be the nearest downstream manhole in the public sewer to the point at which the lateral sewer is connected.
(Ord. 28, 1966; Ord. 318-01)