A. One Unit Minimum. All premises connected to the City sewer system shall be assigned a minimum of one sewer use unit.

B. Dwelling Unit. One sewer user unit shall be assigned to each dwelling unit, including those contained in single-family buildings, multiple-dwelling buildings and each dwelling unit contained in a commercial, industrial, or other improved premises.

C. Nonresidential Premises. For premises other than those provided under subsection (B) of this section, Dwelling Unit, sewer user units shall be assigned as determined by the City Manager, based on the amount and strength of the sewage discharge from the premises. The winter water use for each nonresidential user shall be divided by one thousand (1,000) cubic feet, which is deemed to be the average monthly winter seasonal residential use for the base year, to determine the sewer user units to be assigned. Sewer user units as calculated above shall be rounded to the nearest integer (not less than one).

D. Base Year Water Consumption. Sewer user unit assignments are based on the latest winter season water consumption records available at the time of the first adoption of the ordinance codified in Larkspur Municipal Code Sections 6.12.010, 6.12.040, and 6.12.190 through 6.12.260, and may be revised from time to time. Water consumption by nonresidential users shall be adjusted upon request of the user, according to the decision of the City Manager if a significant portion of the base year water consumption was used for irrigation flows and other flows not discharging to the sewer system.

E. High Strength Sewage. For certain nonresidential premises which discharge sewage, having significantly greater strength characteristics as measured by concentration of solids or biological oxygen demand than residential sewage, the total sewer user unit assignment shall be determined by multiplying the units determined in subsection (C) of this section by the strength factor shown as follows:

For other users, if any, discharging high strength sewage, the strength factor shall be based on the Revenue Program Guidelines for Waste Water Agencies prepared by the State Water Resources Control Board, designated as Exhibit A, found at the end of this chapter.

F. Inquiry Regarding Assignment of Sewer User Units and Strength Factors. Inquiries regarding the assignment of sewer user units and strength factors must be submitted to the City in writing before changes in unit assignment will be made. The City Manager shall have the authority to make appropriate adjustments in sewer user units and strength factors assigned based on the Revenue Program Guidelines for Waste Water Agencies prepared by the State Water Resources Control Board. Decisions of the City Manager may be appealed to the City Council, in writing, within fifteen (15) days of notice to the user. (Ord. 1030 § 2(5), 2018; Ord. 724 § 1, 1985; Ord. 594 § 5, 1978)