Illinois Administrative Code › Title 77 - PUBLIC HEALTH › Part 905 - PRIVATE SEWAGE DISPOSAL CODE › Section 905.20 - General Requirements

Current through Register Vol. 48, No. 28, July 12, 2024
a) Rate of
			 Flow for Domestic Sewage. Each unit of the private sewage disposal system shall
			 be designed to treat the volume of domestic sewage discharged to it. The volume
			 of sewage flow shall be determined from Appendix A, Illustration A. For
			 non-residential establishments, the Department will consider the use of actual
			 flow volumes obtained from similar installations in lieu of the quantities
			 contained in Appendix A, Illustration A, when the flow data is documented.
			 Examples of the documentation that could be accepted would be actual
			 measurements of the quantity of wastewater, or water use receipts. In the
			 design of a private sewage disposal system, peak flows shall be designed for or
			 attenuated.
b) Type of Waste. A
			 private sewage disposal system shall be designed to receive all waste from the
			 buildings served.
1) Prohibited Influent. No
			 sub-soil drainage, discharge from roof drains or swimming pool wastewater shall
			 be directed to the private sewage disposal system.
2) Hot Tub Wastewater. Wastewater generated
			 by a hot tub or similar device shall be discharged to one of the following:
A) A separate subsurface seepage system,
			 provided that the seepage field is designed to accommodate the liquid capacity
			 of the hot tub on a daily basis. A septic tank is not required in front of a
			 seepage field receiving flow from this device.
B) The seepage field serving the domestic
			 wastewater flow, provided the seepage field is increased in size to accommodate
			 the additional flow from the hot tub on a daily basis. This drainage shall be
			 piped around the septic tank and directly into the seepage field.
3) Motorized Equipment. Waste
			 products, such as automotive grease, oils, solvents and chemicals, shall not
			 discharge to a private sewage disposal system. These waste products shall be
			 handled according to rules for disposal of oil, gas and grease promulgated
			 under the Environmental Protection Act, or according to 35 Ill. Adm. Code,
			 Subtitle G, or shall be taken to an oil and gas reclamation center. The floor
			 drain of any non-residential property that meets the requirements of subsection
			 (b)(3)(A) or (B), and is connected to a public sewer, shall be connected to an
			 approved gas and oil interceptor meeting the requirements of Section
			 890.520
			 of the Illinois Plumbing Code. Wastes from floor drains in areas where vehicles
			 or motorized equipment are serviced and parked shall be treated in accordance
			 with the following:
A) For any
			 non-residential property in which a floor drain may receive fluids from vehicle
			 or motorized equipment repair or maintenance activities, floor drains shall be
			 connected to a public sewer or holding tank and not to a private sewage
			 disposal system. Repair and maintenance facilities shall include, but shall not
			 be limited to, service stations and auto body, muffler, transmission, small
			 engine, and brake repair shops. Floor drains in any facility that performs
			 vehicle or motorized equipment repair work shall be connected to a public sewer
			 or holding tank. If the floor drain is connected to a public sewer, then the
			 floor drain shall be connected to an approved gas and oil interceptor meeting
			 the requirements of Section
			 890.520
			 of the Illinois Plumbing Code. If the floor drain is connected to a holding
			 tank, a gas and oil interceptor is not required. The holding tank shall be
			 constructed of the same materials required for gas and oil
			 interceptors.
B) For any
			 non-residential property on which vehicles or motorized equipment are parked or
			 stored and repair or maintenance is not performed, floor drains shall discharge
			 to a public sewer or a private sewage disposal system, provided that floor
			 drains are used only to receive water from motorized equipment or vehicle
			 washing or to drain melted snow. When floor drains in such properties are
			 connected to a private sewage disposal system, the system shall be increased in
			 size based upon the anticipated daily flow. When a maintenance area is adjacent
			 to a parking area, physical barriers, such as a raised curb or recessed floor
			 in the maintenance area, shall be provided to assure that oil and gas are not
			 discharged to floor drains.
C) For
			 any residential property with a garage of any size, floor drains may discharge
			 directly to a private sewage disposal system. No increase in size of the
			 residential private sewage disposal system is required to handle this liquid
			 waste.
4) Drains or
			 fixtures receiving any product other than domestic sewage or wastewater
			 specified in subsection (b)(2) shall be discharged to an approved treatment or
			 disposal system that is regulated and approved by the State or to a holding
			 tank and not to a private sewage disposal system.
5) Water Softener Wastewater. Backwash water
			 from a water softener or similar device shall be discharged to one of the
			 following:
A) A separate subsurface seepage
			 system, provided that the seepage field is designed to accommodate the liquid
			 capacity of the water softener on a daily basis. A septic tank is not required
			 in front of a seepage field receiving flow from this device.
B) A separate building drain, in accordance
			 with the Illinois Plumbing Code, that will discharge to a subsurface seepage
			 system, provided that the seepage field is designed to accommodate the flow
			 from this device on a daily basis. A septic tank is not required in front of a
			 seepage field receiving flow from this device.