Earlier editions: 2026-09
Title 6 — SANITATION AND HEALTH›Chapter 19 — ONSITE WASTEWATER TREATMENT SYSTEMS
Yolo County Municipal Code Art. 4 Definitions
Yolo County Municipal Code · 2026-10 edition · updated 2026-10-03 · Yolo County
Cite as: Yolo County Municipal Code Article 4 · Text as of 2026-10-03
The following words and terms, when used in this chapter, have the following meanings, unless the context clearly indicates otherwise. Terms expressed in the singular shall be constructed to incorporate the plural, and vice versa, unless the context otherwise requires.
Sec. 6-19.401. Alternative system.¶
A type of wastewater disposal or system component(s) that utilizes either a method of wastewater treatment other than a standard septic tank and/or a method of wastewater dispersal other than a standard dispersal field in native soil.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.402. Appeal.¶
The administrative process that allows the Appeal Board to consider relief from any provision or requirement of the Yolo County Onsite Wastewater Treatment System Ordinance and Manual.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.403. Appeal Board.¶
The Appeal Board shall be the Yolo County Board of Supervisors.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.404. Applicant.¶
A property owner or the property owner's authorized representative.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.405. As-built drawing.¶
A scaled drawing of the features on the lot where the system is installed, identifying the location of the installed system and components in relation to structures on the property. The as-built drawing is completed after the system is installed or repaired.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.406. Authorized representative.¶
Person or persons authorized by the property owner to act on the property owner's behalf on matters pertaining to application for permits and services, or holder of an easement sufficient to authorize the work on the land on which the system is to be installed, in order to represent the owner's or easement holder's interests.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.407. Bedroom or potential sleeping room.¶
For purposes of system sizing, a bedroom or potential sleeping room shall mean a habitable room with a floor area equal or greater than seventy (70) square feet with direct or indirect access to a bathroom and designed to provide privacy to the occupant(s), regardless of whether or not it contains a closet. Such rooms include, but are not limited to, rooms labeled on plans as bedrooms, lofts, sewing rooms, dens, offices and game rooms. Kitchens, bathrooms, laundry rooms, or rooms with large entryways lacking doors and designed such that the installation of a door would require a building permit may not be considered bedrooms or potential sleeping rooms. Additionally, rooms that are not considered bedrooms or potential sleeping rooms are rooms that open to a living room, dining room, family room, kitchen, foyer/entry way, or another room such as a master suite, and these rooms have an un-obstructive opening (no doors) with a minimum fifty percent (50%) opening of the total wall space (minimum six feet [6'] wide) with archways or other uncased doorways or acceptable features that do not provide privacy to the occupants. The final determination as to whether a room is a bedroom or potential sleeping room shall be at the discretion of the Director of Environmental Health.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.408. Beneficial use.¶
Those qualities of waters of the state that may be protected against quality degradation that include, but are not necessarily limited to, domestic, municipal, agricultural and industrial supply; power generation, recreation; esthetic enjoyment; navigation; and preservation and enhancement of fish, wildlife and other aquatic resources or preserves.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.409. Building permit.¶
An official document or certificate issued by the authority having jurisdiction which authorizes performance of a specified activity.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.410. Cesspool.¶
An excavation in the ground receiving wastewater, designed to retain the organic matter and solids, while allowing the liquids to seep into the soil. Cesspools differ from seepage pits because a cesspool does not have a septic tank.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.411. Cluster system.¶
An onsite wastewater treatment system serving at least two (2) but not more than four (4) dwellings or other buildings that are sources of wastewater discharge on the same lot and under the same ownership.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.412. Community system.¶
A system that accepts wastewater discharges from two (2) or more lots, or a system shared by dwellings under separate ownership whether or not they are on the same lot. A community system is not a public sewer system.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.413. Contamination.¶
Impairment to the quality of the waters of the state from wastewater to a degree which creates a hazard to public health through toxicity or through the spread of disease. Contamination shall include any equivalent effect resulting from the disposal of wastewater, whether or not waters of the state are affected.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.414. Contractor.¶
A person who possesses an active license as a General Engineering Contractor (Class A), a General Building Contractor (Class B), a Sanitation System Contractor (Class C-42) or a Plumbing Contractor (Class C-36) in accordance with the provisions of the California Business and Professions Code. Contractors shall be approved by DEH and shall possess knowledge, and skills of systems siting, design using given design parameters, and installation.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.415. Cumulative impacts.¶
The persistent and/or increasing effect resulting from the density of system(s) discharges in relation to the assimilative capacity of the local environment. Examples include, but not limited to:
(a) Nitrogen, salt additions, or other indicator of human excreta to groundwater or surface water; or
(b) Rise in groundwater levels that interfere with the performance of the system, causing drainage problems or results in other adverse hydrological or soil conditions affecting public health, water quality or public safety; or
(c) Coliform contamination from animal and human waste in surface water, groundwater, and drinking water wells.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.416. DEH.¶
See Division of Environmental Health
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.417. Director of Environmental Health.¶
The Director of the Yolo County Environmental Health Division, or his/her designated employee.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.418. Dispersal field.¶
The area occupied by the dispersal system; it may also be referred to as leach field.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.419. Dispersal system.¶
A subsurface wastewater distribution system and its components which conveys wastewater from the septic tank, pump tank and or supplemental treatment unit to the soil for subsurface discharge and final wastewater treatment.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.420. Division of Environmental Health (DEH).¶
The Yolo County Division of Environmental Health, the Director of Environmental Health and designated employees.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.421. Domestic wastewater.¶
Wastewater with a measured strength less than high strength wastewater and is the type of wastewater normally discharged from, or similar to, that discharged from plumbing fixtures, appliances and other household devices including, but not limited to toilets, bathtubs, showers, laundry facilities, dishwashing facilities, and garbage disposals. Domestic wastewater may include wastewater from commercial buildings such as office buildings, retail stores, and some restaurants or from industrial facilities where the domestic wastewater is segregated from the industrial wastewater. Domestic wastewater may include incidental recreational vehicle (RV) holding tank dumping but does not include wastewater consisting of a significant portion of RV holding tank wastewater such as at RV dump stations. Domestic wastewater does not include wastewater from industrial processes.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.422. Effective soil.¶
Permeable, unsaturated soil providing sufficient aeration and retention for optimal filtration treatment of sewage effluent.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.423. Effluent.¶
Sewage, water, or other liquid, partially or completely treated or in its natural state, flowing out of a septic tank, aerobic treatment unit, dispersal system, or other system component.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.424. Expansion.¶
The increase in the size of the dispersal field, usually as a result of a planned or potential increase in the estimated wastewater flow to the dispersal field.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.425. Failing system.¶
Any system that is at least one of the following:
(a) Is currently or intermittently discharging untreated or inadequately treated wastewater effluent directly or indirectly onto the ground surface, into a dwelling or other structure, or into surface or groundwater; or
(b) Has a substandard tank or septic tank failure, such as a baffle failure or tank structural integrity failure such that either wastewater is exfiltrating or groundwater is infiltrating; or
(c) Has a component failure, such as a broken distribution box or broken piping connection; or
(d) The dispersal field is not receiving effluent, such that wastewater is backing up into the plumbing fixtures, or the septic tank must be pumped frequently to dispose of the wastewater flow; or
(e) A system installed or repaired without required permits; or
(f) Is not operated in compliance with permit conditions or requirements for operation, monitoring and maintenance as specified in this chapter and the Manual; or
(g) Has been retrofitted with unapproved components or been modified from the original approved design without approval from DEH; or
(h) Does not meet effluent quality standards as specified in the approved system design.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.426. Final approval.¶
The document issued by DEH that certifies the system was installed in compliance with this chapter and the Manual and all permit conditions have been met, including issuance of an operating permit, if required.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.427. Geotechnical report.¶
A written document prepared by a California Registered Geotechnical Engineer and used to communicate soil and geologic site conditions, interpretations, analysis and recommendations pertinent to the design, installation and operation of a system in or near areas of steeply sloping terrain, flood control levees, or unstable land masses.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.428. Graywater.¶
Pursuant to Health and Safety Code Section 17922.12, graywater means untreated wastewater that has not been contaminated by any toilet discharge, and has not been affected by infectious, contaminated, or unhealthy bodily wastes, and does not present a threat from contamination by unhealthful processing, manufacturing, or operating wastes. Graywater includes but is not limited to wastewater from bathtubs, showers, bathroom washbasins, clothes washing machines, and laundry tubs. Graywater includes "dark graywater," which means wastewater from kitchen sinks or dishwashers.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.429. Graywater system.¶
A graywater system that is designed to collect graywater and transport it out of the structure for distribution in shallow soil or mulch. A graywater system may include tanks, valves, filter, pumps, or other appurtenances along with piping and receiving landscape.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.430. Groundwater.¶
Water below the ground surface that is at or above atmospheric pressure. For purpose of this chapter and the Manual, groundwater may also refer to evidence of the high seasonal groundwater as determined through a site evaluation.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.431. High strength wastewater.¶
Wastewater has a 30-day average concentration of biochemical oxygen demand (BOD) greater than 300 milligrams-per-liter (mg/L) or of total solid suspended solids (TSS) greater than 330 mg/L or of fats, oil, and grease (FOG) greater than 100 mg/L prior to the septic tank or other system treatment component.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.432. Holding tank.¶
A watertight receptacle designed to receive and store sewage to facilitate disposal at another location. A holding tank is a non-discharging wastewater disposal unit.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.433. Industrial wastewater.¶
Any wastewater generated from any manufacturing, processing institution, commercial, or agricultural operation, or any operation that discharges other than domestic wastewater.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.434. Installation permit.¶
A document issued by DEH that conveys approval of and sets forth applicable conditions for construction, installation, replacement, enlargement, repair, modification or abandonment of a system, or of system components. The installation permit may also be referred to as the construction permit.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.435. Land use project.¶
A development project requiring a land use entitlement, including, but not limited to, tentative maps, use permits, variances, site plan review, and lot line adjustments, which is implemented through the County of Yolo or city within Yolo County. Land use projects requiring conditions from this chapter and the Manual shall be regulated by the Director of Environmental Health. Other county city requirements have separate processes and requirements.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.436. Large system.¶
A large system is a system with a design flow greater than 1,500 gallons per day.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.437. Lot.¶
A legally recognized and defined piece of land that can be sold individually, as described on an instrument or map recorded or filed with the County Recorder. A lot may also be referred to as parcel. Public road easements on lots should be excluded from the lot for the purpose of locating a system.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.438. Manual.¶
See Onsite Wastewater Treatment System Manual.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.439. Minimum useable wastewater dispersal area (MUWDA).¶
The amount of useable ground surface, expressed in square feet that is required when creating new lots or parcels in the tentative or parcel map process. The amount of land area is based on the site specific information obtained through site evaluation.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.440. Non-discharging wastewater disposal unit.¶
A self-contained, watertight container designed to hold wastewater until it is pumped and/or cleaned. A non-discharging wastewater disposal unit includes but is not limited to a holding tank, vault privy, portable toilet, and waterless toilet.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.441. Onsite wastewater treatment system (system).¶
A wastewater disposal facility that includes tanks, piping, treatment devices or other facilities that convey, store, treat or dispose of wastewater located on the property where it originates or an adjacent or nearby property under the control of the user which is not connected to a public sewer system. This definition includes the designated replacement area necessary for system repairs. Onsite wastewater treatment system does not include graywater systems pursuant to Health and Safety Code Section 17922.12, non-discharging wastewater disposal units, and public sewer system(s).
An onsite wastewater treatment system may be referred to as system in this chapter. It may also be referred to as a septic system, wastewater system or OWTS in references, supporting documents and Manuals.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.442. Onsite Wastewater Treatment System Manual (Manual).¶
The document developed, maintained, and amended by DEH, containing policy, procedural and technical details for implementation of this chapter, as prescribed by the Director of Environmental Health, as approved by the Central Valley Regional Water Quality Control Board and adopted by resolution of the Board of Supervisors of Yolo County. It is referred to as Manual in this chapter.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.443. Onsite Wastewater Treatment System Policy (OWTS Policy).¶
The Water Quality Control Policy for Siting, Design, Operation and Maintenance of Onsite Wastewater Treatment Systems (OWTS Policy), adopted by the State Water Resources Control Board, took effect on May 13, 2013. The OWTS Policy establishes a statewide, risk-based, tiered approach for regulation and management of system installations and replacements. The purpose of the policy is to allow the continued use of systems while protecting water quality and public health.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.444. Operating permit.¶
The administrative document issued by DEH that authorizes the initial and/or continued use of an alternative system in conformance with the provisions of the ordinance and Manual, intended to aid in verification of the adequacy of the system performance and that may contain both general and specific conditions of use. An operating permit may also be required for circumstances other than an alternative system as provided in this chapter or where, in the opinion of the Director of Environmental Health, the type, size, location, strength of effluent or other details of a particular system and/or wastewater activity warrant the additional level of oversight provided by an operating permit.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.445. Operation, Maintenance and Monitoring (OM&M) Program.¶
A program that encourages or requires regular inspections, monitoring, and/or service to systems, non-discharging wastewater disposal units, and graywater systems as delineated in the Manual to ensure long- term performance, and groundwater and public health protection.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.446. Owner.¶
Any person who alone, or with others:
(a) Has legal title to any single lot, dwelling, dwelling unit, or commercial facility, or an easement, sufficiently to allow installation and maintenance of the system; or
(b) Has care, charge, or control of any real property as applicant, executor, executrix, administrator, trustee or guardian of the estate of the holder of legal title.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.447. Percolation test.¶
A method of testing water absorption of the soil. The test is conducted with clean water and test results can be used to establish a dispersal system design. Percolation tests shall be conducted as provided in the Manual or as specified by DEH.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.448. Person.¶
Any individual, firm, association, organization, partnership, corporation, business trust, company, state agency or department, or unit of local government who is, or that is, subject to this chapter, the Manual and all the permit conditions.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.449. Portable toilet.¶
Any self-contained chemical toilet facility that is housed within a portable toilet shelter. The portable toilet has no direct water connection and is a non-discharging wastewater disposal unit.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.450. Public nuisance.¶
"Public nuisance" shall include but not be limited to, anything which:
(a) Is injurious to public health or is indecent or offensive to the senses or any obstruction to the free use of property so as to interfere with the comfortable enjoyment of life or property; and
(b) Affects at the same time the public, a community or neighborhood, or any number of persons, although the extent of the annoyance or damage inflicted upon individuals may be different or unequal; and
(c) Is an attractive nuisance which may prove detrimental to children or others, whether in a building, on the premises of a building, or upon an unoccupied lot. This includes any abandoned wells or shafts, failing system, abandoned system, cesspool, seepage pit, system installed without an installation permit; and
(d) Is dangerous to human life or is detrimental to health, as determined by the Director of Environmental Health; and
(e) Inadequate or unsanitary or unapproved sewage or plumbing facilities.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.451. Public sewer system.¶
Any sewer system constructed, installed, maintained, operated and owned by or for a municipality or public entity established for sewage dispersal purposes.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.452. Public water system.¶
A system for the provision to the public of water for human consumption through pipes or other constructed conveyances, if such system has at least fifteen (15) service connections or regularly serves at least twenty-five (25) individuals, as defined Part 12, Chapter 4, Section 116275 of the California Health and Safety Code.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.453. Qualified system designer.¶
A person who possesses knowledge, skills and experience in system design and who is qualified to perform professional engineering in accordance with Section 6731 of the Business and Professions Code; or who is licensed as a California Registered Environmental Health Specialist. Notwithstanding Section 6731 of the Business and Professions Code, a California Registered Geologist that has experience designing systems in Yolo County prior to the effective date of this ordinance may continue to design systems with the approval of the Director of Environmental Health, provided however the California Registered Geologist bases the system design on specifications found in the Manual and engineering design specifications provided by manufacturers of system components.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.454. Qualified professional.¶
An individual licensed or certified by the State of California and who has been approved by DEH to perform site evaluations and to practice as an expert as allowed under their license or registration and as demonstrated by their possession of knowledge, and skills of soils; and systems siting, design and installation. Depending on the work to be performed and various licensing and registration requirements within the provisions of the California Business and Professions Code, this shall include an individual with one (1) or more of the following credentials:
(a) California Certified Engineering Geologist
(b) California Registered Professional Engineer
(c) California Registered Environmental Health Specialist
(d) California Registered Geologist
For the purpose of performing site evaluations, soil scientists certified by the Soil Science Society of America are considered as qualified professionals.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.455. Regional Water Quality Control Board.¶
The California Regional Water Quality Control Boards (RWQCB) designated by Water Code Section 13200, which have authority for adopting, implementing and enforcing water quality control plans (also called basin plans) which set forth the state's water quality standards and the objectives or criteria necessary to protect those beneficial uses. The Central Valley RWQCB has jurisdiction over Yolo County.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.456. Replacement area.¶
An area of land dedicated for replacement of an entire system upon its failure.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.457. Seepage pit.¶
A drilled or dug excavation, three (3) to six (6) feet in diameter, and typically fifteen (15) to thirty-five (35) feet in depth either lined or gravel filled, that receives the effluent discharge from a septic tank or other system treatment unit for disposal of effluent.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.458. Septage.¶
Materials accumulated in septic tanks, cesspools, vault privies, portable toilets, holding tanks, waterless toilets, or any other sewage holding apparatus that receives bodily waste or wastewater from plumbing fixtures. Septage does not include sewage sludge from public sewer system.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.459. Septage pumper.¶
A person with an active approved septage pumper permit issued by the Director of Environmental Health pursuant to California Health and Safety Code section 117400 et seq., who is qualified to pump and haul waste from septic tanks, chemical toilets, cesspools, sewage seepage pits, chemical toilets, waterless toilets, or other sewage containments.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.460. Septic tank.¶
A watertight receptacle which receives sewage from a building or structure, that functions to separate solids from liquids, retains and digests organic matter and discharges the resulting effluent to a second treatment unit or to a soil disposal area.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.461. Service provider.¶
An individual approved by DEH to perform or conduct oversight of inspections, maintenance and monitoring of systems operating under the Operation, Monitoring and Maintenance (OM & M) Program. Service providers shall be approved by DEH and possess knowledge and skills of systems and possess one (1) or more of the credentials required of a qualified professional or contractor as defined in this chapter. In addition, demonstration of proper training from equipment manufacturers/distributors and/or certification from an appropriate professional organization may be required.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.462. Site evaluation.¶
An assessment of the characteristics of a lot sufficient to determine its suitability for the installation and sustainability of a system meeting the requirements of this chapter and the Manual. The site evaluation shall be in accordance with procedure and criteria contained in this chapter. The site evaluation shall take into consideration the public and environmental health aspects relating to the installation and operation of a system, including but not limited to, soil texture, soil percolation rate (if a percolation test is performed), depth to groundwater, distance from natural land features and structures, site topography, and usable space for the installation and repair of the system.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.463. Site evaluation report.¶
A report prepared by a qualified professional that includes all information obtained from a site evaluation.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.464. Site map review.¶
An assessment of the surface features and/or soil characteristics as referenced in USDA soil maps which approved a lot as suitable for a system installation prior to the effective date of this ordinance.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.465. Slope.¶
The rise or fall in feet per one hundred (100) feet of horizontal distance. Slope is expressed as a percent of grade. For example: a land surface at a forty-five (45) degree angle has a slope of one hundred percent (100%).
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.466. Soil.¶
The naturally occurring body of porous mineral and organic materials on the land surface, which is composed of unconsolidated materials, including sand-sized, silt-sized, and clay-sized particles mixed with varying amounts of larger fragments and organic material. The various combinations of particles differentiate specific soil textures identified in the soil textural triangle developed by the United States Department of Agricultural (USDA). For the purposes of this ordinance, soil shall contain earthen material of particles smaller than eight one-hundredths (0.08) inch (two [2] mm) in size.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.467. Soil texture.¶
The relative proportions of soil separates in a soil as described by the twelve (12) classes of soil texture as defined by the United States Department of Agriculture.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.468. Standard system.¶
A system comprised of a septic tank and a gravity-fed dispersal system which includes trenches installed in approved undisturbed native soil. Effluent will flow to the trenches by gravity, or may be pumped to the first distribution box of the dispersal field.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.469. Subdivision.¶
"Subdivision" shall mean a subdivision as defined by the Subdivision Map Act of the State (Government Code Section 66410 et seq).
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.470. Substandard tank.¶
Any tank constructed of wood or brick, or any tank which is deteriorated to an extent that it cannot effectively hold and or treat wastewater, or because of its condition poses a threat to health or safety.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.471. Supplemental treatment.¶
A supplemental treatment unit or engineered system used to perform additional wastewater treatment functions, beyond that provided by a standard system, and capable of reliably producing wastewater effluent of secondary quality or better, prior to discharge to the dispersal system. For purposes of this chapter, secondary quality is defined as effluent meeting thirty (30) day average concentration limits of thirty (30) mg/L for biological oxygen demand and thirty (30) mg/L for total suspended solids. If the supplemental treatment is for the purpose of nitrogen reduction, the supplemental treatment is defined as meeting a fifty (50) percent reduction in total nitrogen when comparing the thirty (30) day average influent to the thirty (30) day average effluent.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.472. Supplemental treatment unit.¶
Alternative system listed by National Sanitation Foundation (NSF) and certified by NSF as meeting NSF Standard 40, NSF Standard 245 or equivalent, is designed to provide enhanced treatment over that which would be provided by a standard system, and that produces effluent meeting a predetermined performance requirement as specified in this chapter and in the Manual, prior to dispersal into the dispersal field. An independent third party testing and listing agency which provides equivalent services as compared to NSF for testing and continuous quality control and consumer complaint response may be used in lieu of NSF upon the approval of the Director of Environmental Health.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.473. System.¶
See Onsite Wastewater Treatment System
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.474. System design.¶
A system installation/construction plan prepared by a qualified system designer or contractor based on the site evaluation report.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.475. Unstable land mass.¶
Land prone to subsidence, erosion, or mass land movement as indicated by historical landslide events, published maps or reports, or evidence of characteristics such as surface rupture, scarps, creep or other irregularities in ground slope conditions.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.476. Vault privy.¶
A vault privy is a structure used for disposal of human waste without the aid of water. It consists of a shelter built above a subsurface vault into which human waste falls. The vault privy has no water connection. A vault privy is a non-discharging wastewater disposal unit.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.477. Vertical separation.¶
The depth of effective soil for effluent filtration that exists between the bottom of a dispersal field and the restrictive or limiting layer or feature including, but not limited to:
(a) Permanent or seasonal groundwater level; or
(b) Consolidated soil with insufficient permeability or porosity to provide wastewater treatment; or
(c) Fractured rock with excessive permeability that would not provide effective wastewater treatment; or
(d) Soils determined to be limiting as defined in the Manual.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.478. Wastewater.¶
Wastewater includes "blackwater" or "graywater".
(a) Blackwater means wastewater contaminated with human or kitchen wastes, generally originating from toilets and kitchen sinks. It includes, but is not limited to, wastewater discharges from kitchen sinks, garbage grinders, water closets, toilets, urinals or similar fixtures alone or in combination with other wastewater.
(b) Graywater: Pursuant to Health and Safety Code Section 17922.12, graywater means untreated wastewater that has not been contaminated by any toilet discharge, and has not been affected by infectious, contaminated, or unhealthy bodily wastes, and does not present a threat from contamination by unhealthful processing, manufacturing, or operating wastes. Graywater includes but is not limited to wastewater from bathtubs, showers, bathroom washbasins, clothes washing machines, and laundry tubs. Graywater includes "dark graywater," which means wastewater from kitchen sinks or dishwashers.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.479. Watercourse.¶
A definite channel with bed and banks within which water flows perennially, including overflow channels contiguous to the main channel. A watercourse may be either a natural or man-made channel. For purposes of this chapter, watercourse also includes water bodies such as ponds, lakes, marshes, seasonal wetlands and tidal waters.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.480. Waterless toilet.¶
A composting toilet, incinerating toilet or similar device for the holding and processing of wastewater from a toilet. A waterless toilet is a non-discharging wastewater disposal unit.
(Ord. 1469, eff. July 14, 2016)
Article 5: Onsite Wastewater Treatment System Manual
Sec. 6-19.501. Manual.¶
The Manual shall govern the siting, design, installation, component quality, operation, monitoring, and maintenance of systems, graywater systems, and non-discharging wastewater disposal units in Yolo County, and provide administrative procedures for the implementation of this chapter. The Manual shall be adopted by resolution of the Yolo County Board of Supervisors. When changes are proposed to the Manual, DEH shall provide a reasonable process for seeking input from the affected public, and the changes shall be presented to the Yolo County Board of Supervisors as an amending resolution.
(Ord. 1469, eff. July 14, 2016)
Sec. 6-19.502. Wastewater application rates and septic tank size.¶
Requirements for maximum wastewater application rates and minimum septic tank size shall be as is provided in the Manual.
(Ord. 1469, eff. July 14, 2016)
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