Earlier editions: 2026-09
Title 6 — SANITATION AND HEALTH›Chapter 6 — STORMWATER DRAINAGE SYSTEM
Ontario Municipal Code Art. 2 General Conditions and Prohibitions
Ontario Municipal Code · 2026-10 edition · updated 2026-10-03 · Ontario
Cite as: Ontario Municipal Code Article 2 · Text as of 2026-10-03
Sec. 6-6.201. Administration.¶
The City Engineer shall administer, implement and enforce the provisions of this chapter. Any powers granted to or duties imposed upon the City Engineer, may be delegated by the City Engineer to persons authorized by the Engineer and in the employ of the City of Ontario.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.202. Applicability.¶
This chapter shall apply to all dischargers, including all residents as well as commercial, industrial and construction enterprises, to the City's stormwater drainage system, and to dischargers outside the City who, by agreement with the City, utilize the City's stormwater drainage system.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.203. Notice.¶
Unless otherwise provided herein, any notice required by this chapter shall be in writing and served in person, by first class, registered or certified mail. Notice shall be deemed to have been given at the time of deposit, postage or prepaid, in a facility regularly serviced by the United States Postal Service.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.204. Connections.¶
(a) The discharge or diversion of stormwater or non-stormwater is permissible when the connection to the City's stormwater drainage system is made in accordance with a valid construction permit, approved construction plan, and, if applicable, an NPDES Stormwater Permit and the discharge is not prohibited under § 6-6.206 of this chapter.
(b) It is prohibited to establish, use maintain and/or continue any illicit drainage connections to the City's stormwater drainage system. This prohibition is retroactive and applies to connections made in the past, regardless of whether the connection was made under a permit or other authorization or whether the connection was permissible under the law or practices applicable or prevailing at the time of the connection.
(c) Construction permits are required for the construction or modification of any storm drain or conveyor of drainage waters and appurtenant items within:
(1) Dedicated easements, rights-of-way, or public place and/or facility.
(2) Private property so as it may directly or indirectly discharge into the City's stormwater drainage system. Indirect discharges include, but are not limited to, under sidewalk drains, driveway approaches, and unrestricted sheet flow.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.205. Protection of the stormwater drainage system.¶
Without the prior written approval of the City's Engineer, no person shall construct, modify or cause to be constructed or modified any structure, facility or appurtenant items which may alter the normal functioning of the City's stormwater drainage system, including any action which may alter the capacity, fall, or structural integrity of a storm drain, channel or related structures.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.206. Prohibited discharges.¶
It is prohibited to:
(a) Discharge non-stormwater directly or indirectly to the City's stormwater drainage system, or any street, lined or unlined drainage channel which leads to the City's storm drain or directly or indirectly into any waters of the State unless such discharge is authorized by either a separate NPDES permit or as otherwise specified in § 6-6.207 of this chapter, if such discharge is permitted by a NPDES permit or is generally exempted, but causes the City to violate any portion of its NPDES permits for stormwater discharges, such discharge is also prohibited;
(b) Discharge stormwater into the City's stormwater drainage system containing pollutants that have not been reduced to the maximum extent practicable;
(c) Throw, deposit, leave, maintain, keep, or permit to be thrown, deposited, placed, left or
maintained, any refuse, garbage, sediment or other discarded or abandoned objects, articles, and accumulations, in or upon any street, alley sidewalk, storm drain, inlet, catch basin, conduit or other drainage structures, business place, or upon any public or private lot of land in the City, so that the same may be and/or may become a pollutant.
(d) Throw or deposit any refuse, garbage or any other pollutants into any fountain, pond, lake, stream or any other body of water in a park or elsewhere within the City.
(e) Discharge any of the following types of waste into the City's stormwater drainage system:
(1) Sewage;
(2) Surface cleaning wash water resulting from mopping, rinsing, pressure washing or steam cleaning of gas stations, and vehicle service businesses or any other business;
(3) Discharges resulting from the cleaning, repair, or maintenance of any type of equipment, machinery, or facility including motor vehicles, concrete mixing equipment, portable toilet servicing, etc.;
(4) Wash water from mobile auto detailing and washing, steam and pressure cleaning, carpet cleaning, drapery and furniture cleaning, etc.;
(5) Waste water from cleaning municipal, industrial, commercial, residential areas (including parking lots), streets, sidewalks, driveways, patios, plazas, work yards and outdoor eating or drinking areas, containing chemicals or detergents and without prior sweeping, etc.;
(6) Stormwater runoff from material or waste storage areas containing chemicals, fuels, grease, oil or other hazardous materials or contaminated equipment;
(7) Discharges from pool or fountain water containing chlorine, biocides, acids or other chemicals; pool filter backwash containing debris and chlorine;
(8) Pet waste, yard waste, debris, sediment, etc.;
(9) Restaurant wastes such as grease, mop water, and wash water from cleaning dishes, utensils, laundry, floors, floor mats, trash bins, grease containers, food waste, etc.;
(10) Chemicals or chemical waste;
(11) Medical wastes;
(12) Blow down or bleed water from cooling towers and boilers, regenerative brine waste from water softeners or reverse osmosis treatment systems;
(13) Materials or chemical substances that cause damage to the City's stormwater drainage system;
(14) Any other material that causes or contributes to a condition of contamination, nuisance or pollution in the City's storm drainage system or causes a violation of any waste disposal regulations, waste discharge requirements, water quality standards or objectives adopted by the State Water Resources Control Board, Regional Water Quality Control Board, EPA, San Bernardino County Fire Hazmat, San Bernardino County Flood Control District or any other public agency with jurisdiction.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.207. Exceptions to the prohibited discharges.¶
(a) The following discharges of non-stormwater into the City's storm drainage system are generally exempt from the Prohibited Discharges listed in § 6-6.206 of this chapter. However, items 12 through 22, below, have been identified as potential significant sources of pollutants and require coverage under the Regional Board's De Minimus Permit as well as prior approval by the City's Engineering Department, Environmental Section, before discharge (see *note below):
(1) Discharges covered by NPDES permits or written clearances issued by the Regional or State Board;
(2) Landscape irrigation, lawn watering, and irrigation water;
(3) Water from crawl space pumps;
(4) Air conditioning condensation;
(5) Non-commercial car washing;
(6) Rising ground waters and natural springs;
(7) Ground water infiltration as defined in 40 CFR 35.2005 (20) and uncontaminated pumped ground water;
(8) Water flows from riparian habitats and wetlands;
(9) Water flows generated from emergency response and/or fire fighting activities, however, appropriate BMPs shall be implemented to the extent practicable; BMPs must be implemented to reduce pollutants from non-emergency fire fighting flow;
(10) Waters not otherwise containing wastes as defined in Cal. Water Code § 13050(d),
(11) Other types of discharges identified and recommended by the City and approved by the Regional Water Quality Control Board.
(12) *Potable water line testing or flushing and other discharges from potable water sources;
(13) *Water from fire hydrant testing and flushing using appropriate BMPs;
(14) *Water from passive foundation drains or passive footing drains;
(15) *Dechlorinated swimming pool discharges;
(16) *Diverted stream flow;
(17) *Wastes associated with well installation, development, test pumping and purging;
(18) *Aquifer testing wastes;
(19) *Discharges from hydrostatic testing of vessels, pipelines, tanks, etc.;
(20) *Discharges from the maintenance of potable water supply pipelines, tanks, reservoirs, etc.;
(21) *Discharges from the disinfection of potable water supply pipelines, tanks, reservoirs, etc.;
(22) *Discharges from potable water supply systems resulting from system failures, pressure releases, etc.;
*Note: The City of Ontario requires that a “Non-Stormwater Discharge Notification Form be submitted to the Engineering Department for approval of these discharges, five days prior to any planned discharges or, as soon as possible, for any unplanned discharges. The Notification Form is available from the Engineering Department counter. Monitoring may also be required for these discharges.
The Regional Board may issue Waste Discharge Requirements for discharges exempted from NPDES requirements, if identified to be a significant source of pollutants. The Executive Officer of the Board may also add categories of non-stormwater discharges that are not significant sources of pollutants or remove categories of non-stormwater discharges listed above based upon a finding that the discharges are a significant source of pollutants. In this case, the list of exempted discharges, above, would be adjusted accordingly.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.208. Compliance with best management practices (BMPs).¶
Any person undertaking any activity or operation in the City of Ontario that could potentially cause or contribute to stormwater pollution or a discharge of non-stormwater shall comply with all applicable Best Management Practices (BMPs) as listed in the California Stormwater Best Management Practice Handbooks or the current, San Bernardino County Stormwater Program's “Report of Waste Discharge”, to reduce pollutants in stormwater runoff and reduce non-stormwater discharges to the City's stormwater drainage system to the maximum extent practicable or to the extent required by law.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.209. Affirmative defense.¶
A discharger shall have an affirmative defense in any action brought against it alleging a violation of § 6-6.206 of this chapter where the discharger can demonstrate it did not know or have reason to know that its discharge, alone or in conjunction with a discharge or discharges from other sources, would cause violation of this chapter or the Areawide Urban Stormwater Runoff Permit.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.210. Spill containment.¶
Persons storing chemicals or chemical waste outdoors shall be required to install spill containment subject to requirements established by the City Engineer and Federal, State and County Standards. Persons storing any other materials or equipment that are potential sources of stormwater pollution are also required to install spill containment. No person shall operate a spill containment system that could allow incompatible materials and/or wastes to mix, thereby creating hazardous or toxic substances in the event of failure of one or more containers.
Spill containment systems shall consist of a system of dikes, walls, barriers, berms and/or other devices designed to contain the spillage of the liquid contents of the containers stored in them and to minimize the buildup of stormwater from precipitation, and run-on from roof drainage and outside areas. If the spill containment system does not have a roof which covers the entire contained area, the spill containment system shall have the capacity to contain precipitation from at least a twenty-four (24) hour, twenty-five (25) year rainfall event plus ten percent (10%) of the total volume of the material stored there or the volume of the largest container, whichever is greater. Spill containment systems shall also be constructed of impermeable and non-reactive materials to the materials and/or wastes being contained.
Spilled and/or leaked materials and/or wastes and any accumulated precipitation shall be removed from the spill containment system in as timely a manner as is necessary to prevent the overflow of the spill containment system. Unless otherwise approved by the City Engineer, all chemicals or wastes discharged within the spill containment system shall be disposed of in accordance with all applicable Federal, State, and local rules, regulations, and laws, and shall not be discharged into the City's sanitary sewer system, stormwater drainage system or onto the ground.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.211. Immediate notification of accidental discharge.¶
Protection of the City's stormwater drainage system from the accidental discharge of prohibited materials or wastes is the responsibility of the person or persons in charge of such material. Detailed plans showing facilities and operating procedures to provide this protection shall be submitted to the City for review, and shall be approved by the City Engineer prior to any construction. All new and existing dischargers shall complete such a plan. Review and approval of such plans and operating procedures shall not relieve the discharger from the responsibility to modify his or her facility as necessary to meet the requirements of this chapter.
A notice shall be permanently posted in a prominent place advising employees whom to contact in the event of an accidental discharge. Employers shall ensure that all employees are advised of the emergency notification procedures. In the event of an accidental discharge, it is the responsibility of the discharger to immediately telephone and notify the proper authorities.
All discharges released into the City's stormwater drainage system, including a street or gutter, shall be immediately reported to the City's Engineering Department and Fire Department. All discharges that pose a threat to human health or the environment shall be reported to the Executive Officer of the California Regional Water Quality Control Board within twenty-four (24) hours by telephone or e-mail and followed with a written report of the spill event within five (5) days. At a minimum, all sewage spills over one thousand (1,000) gallons and all reportable quantities of hazardous materials or hazardous waste shall be reported within twenty-four (24) hours.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.212. Written notification of accidental discharge.¶
Within five (5) working days following an accidental discharge into the City's stormwater drainage system, the person or persons in charge of the material and/or waste which was accidentally discharged shall submit a written report to the City Engineer. The report shall describe in detail the type and volume of the material and/or waste and the cause of the discharge. The report shall also describe in detail all corrective actions taken and measures to be taken to prevent future occurrences.
Such notification of the accidental discharge shall not relieve the user of any fines or civil penalties incurred as a result of the event or any other liability which may be imposed by this chapter or other applicable laws.
(§ 2, Ord. 2755, eff. April 4, 2002)
Sec. 6-6.213. Authority to inspect.¶
(a) The City Engineer or his or her designated representative shall be authorized, at any reasonable time, to enter the premises of any discharger to the City's stormwater drainage system to determine compliance with the provisions of this chapter, and to:
(1) Conduct inspection, monitoring, and/or other authorized duties to enforce the provisions of this chapter;
(2) Review any records, reports, test results or other information required to enforce the provisions of this chapter. Such review may include the necessity to photograph, videotape, or copy any applicable information; and
(3) Inspect any chemicals, materials, wastes, storage areas, storage containers, and waste generating processes, treatment facilities, and discharge locations. Such inspection may include the necessity to photograph or videotape any applicable chemicals, materials, wastes, storage areas, storage containers, waste generating processes, treatment facilities, and discharge locations.
(b) The City Engineer or his or her designated representative shall provide adequate identification when entering the premises of any discharger. If such entry is refused or cannot be obtained, the City Engineer shall have recourse to every remedy provided by law to secure lawful entry and inspection of the premises.
(c) If the City Engineer has reasonable cause to believe that non-stormwater discharge conditions on or emanating from the premises are of a nature so as to require immediate inspection to safeguard public health or safety, the City Engineer shall have the right to immediately enter and inspect said property and may use any reasonable means required to effect such entry and make such inspection, regardless if said property is occupied or unoccupied and regardless if formal permission to inspect said property has been obtained.
(d) Where a discharger has instituted security measures requiring proper identification and clearance before entry onto the premises, the discharger shall make all necessary arrangements with its security agents in order that, upon presentation of such identification, the City Engineer or his or her designated representative(s) shall be permitted to enter the premises without delay, for the purpose of performing their authorized duties. For facilities, which require special clearances to conduct inspections, it shall be the responsibility of the discharger to obtain all necessary clearances on behalf of the City so that the inspection is not impaired.
(§ 2, Ord. 2755, eff. April 4, 2002)
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