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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations <br />SECTION 5 ACCEPTABLE AND PROHIBITED DISCHARGES <br />5.1 Sewage. <br />This Chapter provides design standards for SSTS that receive sewage. If an SSTS receives both sewage and <br />nonsewage, the requirements of this chapter and requirements governing the nonsewage portion of the water apply. <br />5.2 System influent. <br />(1) Footing or roof drainage and chemically treated hot tub and pool water must not be discharged into <br />any part of a SSTS. Hazardous waste must not be discharged to a SSTS. Products containing <br />hazardous chemicals must not be discharged to an SSTS other than normal amounts of household <br />cleaners designed for household use. Substances not intended for use in household cleaning, <br />including but not limited to, solvents, pesticides, flammables, photo finishing chemicals, paint, and <br />dry-cleaning chemicals must not be discharged to a SSTS. Other unused products or substances, or <br />unused medicines, must not be discharged to a SSTS as a method of disposal. Floor drains from <br />garages serving dwellings, vehicle maintenance businesses, or any other floor drain that would have <br />the potential to introduce hazardous waste into the SSTS, must not be connected to a SSTS. <br />(2) An ISTS must be designed to provide additional treatment if: <br />(A) Raw sewage exceeds 300 mg/L BOD, 200 mg/L TSS, or 50 mg/L oil and grease; or <br />(B) Sewage tank effluent applied to the soil from the sewage tank or other secondary treatment <br />device is greater than the concentrations in Section 12.11. <br />(3) Additional treatment must be designed by a Minnesota licensed professional engineer or according <br />to the recommendations in the Prescriptive Designs and Design Guidance for Advanced Designers, <br />which is incorporated by reference, or must use a product registered under Minnesota Rules, <br />Chapter 7083. <br />(4) Prescriptive Designs and Design Guidance for Advanced Designers, Minnesota Pollution Control <br />Agency (October 2013 and as subsequently amended), is made a part of this ordinance by <br />reference, is subject to frequent change, and is available at <br />www.pca.state.n-m.us/programs/ists/technical.html. <br />5.3 Domestic waste. <br />Only domestic strength waste shall be discharged to a soil dispersal and treatment area. Sewage tank effluent with a <br />waste strength higher than domestic waste shall be pre-treated to a level equal to or less than domestic waste prior to <br />final treatment and disposal in a soil treatment and dispersal area. <br />26 Washington County Development Code <br />