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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations (47) Graywater. "Graywater" means sewage that does not contain toilet wastes. Liquid wastes from a dwelling or other establishment produced by bathing, laundry, culinary operation, and from floor drains associated with these sources are considered graywater. (48) Graywater system. "Graywater system" means a system that receives, treats, and disperses only graywater or similar systems designated as such by the commissioner. (49) Groundwater mound. "Groundwater mound" means the rise in height of the periodically saturated soil or regional water table caused by the addition of sewage effluent from a subsurface sewage treatment system into the soil. (50) Hazardous waste. "Hazardous waste" means any substance that, when discarded, meets the definition of hazardous waste in Minnesota Statutes, section 116.06, subdivision 11, Minnesota Rules 7045, or the Washington County Hazardous Waste Management Ordinance. (51) Holding tank. "Holding tank" means a tank for the storage of sewage until such time as it can be transported to a point of treatment and dispersal. Holding tanks are considered septic system tanks under Minnesota Statutes, section 115.55. (52) Individual subsurface sewage treatment system or ISTS. "Individual subsurface sewage treatment system" or "ISTS" means a sewage treatment system or part thereof, as set forth in Minnesota Statutes, sections 115.03 and 115.55, that employs sewage tanks or other treatment devices with final discharge into the soil below the natural soil elevation or elevated final grade that are designed to receive a sewage design flow of 5,000 gallons per day or less. ISTS also includes all holding tanks that are designed to receive a design flow of 10,000 gallons per day or less; sewage collection systems and associated tanks that discharge into ISTS treatment and dispersal components; and privies. ISTS does not include those components defined as plumbing under Minnesota Rules, Chapter 4715. (53) Inner wellhead management zone. "Inner wellhead management zone" means the drinking water supply management area for a public water supply well that does not have a delineated wellhead protection area approved by the Department of Health under Minnesota Rules, Chapter 4720, section 4720.5330. (54) Invert. "Invert" means the lowest point of a channel inside a pipe. (55) Licensed advanced design business. "Licensed advanced design business" means a business that is authorized to conduct site and soil evaluations, design systems, and write management plans for all sizes and types of SSTS up to 10,000 gallons per day. (56) Licensed advanced inspection business. "Licensed advanced design business" means a business that is authorized to conduct compliance inspections and issue certificates of compliance and notices of noncompliance for all sizes and types of SSTS up to 10,000 gallons per day. (57) Licensed basic design business. "Licensed basic design business" means a business that is authorized to conduct site and soil evaluations, design systems, and write management plans for a Type I, II or III ISTS as described in Section 17 to Section 19 serving dwellings or other establishments with a design flow of 2,500 gallons per day or less. (58) Licensed installation business. "Licensed installation business" means a business that is authorized to construct, install, alter, extend, or repair all SSTS according to an approved design. (59) Licensed basic inspection business. "Licensed basic inspection business" means a business that is authorized to conduct compliance inspections and issue written certificates of compliance and notices of noncompliance for an existing Type 1,11, or III ISTS as described in Section 17 to Section 19 serving dwellings or other establishments with a design flow of 2,500 gallons per day or less. (60) Licensed intermediate design business. "Licensed intermediate design business" means a business that is authorized to conduct site and soil evaluations, design systems, and write management plans for a Type I, II,111, IV or V ISTS as described in Section 17 to Section 21 serving dwellings or other establishments with a design flow of 2,500 gallons per day or less. (61) Licensed intermediate inspection business. "Licensed intermediate inspection business" means a business that is authorized to conduct compliance inspections and issue written certificates of compliance and notices of noncompliance for an existing Type 1,11, III, IV or V ISTS as described 13 Washington County Development Code