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(a)(1)Threat to water quality TTWQ and complexity CPLX of the discharge is assigned by the Regional Board in accordance with the following definitions: THREAT TO WATER QUALITY Category "I"—Those discharges of waste that could cause the long-term loss of a designated beneficial use of the receiving water. Examples of long-term loss of a beneficial use include the loss of drinking water supply, the closure of an area used for water contact recreation,or the posting of an area used for spawning or growth of aquatic resources, including shellfish and migratory fish. Category "2*'—Those discharges of waste that could impair the designated beneficial uses of the receiving water, cause short-term violations of water quality objectives, cause secondary drinking water standards to be violated, or cause a nuisance. Category "3"—Those discharges of waste that could degrade water quality without violating water quality objectives, or could cause a minor impairment of designated beneficial uses as compared with Category 1 and Category 2. COMPLEXITY Category "A"—Any discharge of toxic wastes, any small volume discharge containing toxic waste or having numerous discharge points or ground water monitoring,or any Class 1 waste management unit. Category `B"—Any discharger not included above that has physical, chemical, or biological treatment systems (except for septic systems with subsurface disposal),or any Class 2 or Class 3 waste management units. Category "C"—Any discharge for which waste discharge requirements have been prescribed pursuant to Section 13263 of the Water Code not included as a Category "A"or Category "B"as described above. Included would be-discharges having no waste treatment systems or that must comply with best management practices,discharges having passive treatment and disposal systems, or dischargers having waste storage systems with land disposal. (a)(2) For dischargers covered under Statewide General WDRs for Sanitary Sewer Systems(Water Quality Order No. 2006-0003), the TTWQ and CPLX designations are assigned based on the population served by the sanitary sewer system. The table below describes the correlation between population served and TTWQ and CPLX designations to determine the appropriate annual fee: Population Served Threat and Complexity Designation Less than 50,000 ---- 3C 50.000 or more — 2C "Assumes 2.5 persons per equivalent dwelling unit(EDU). 2