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25 <br /> <br />occupied. <br /> <br /> (3) In the absence of metered use or other comparable <br />information, the following sources of design information may <br />be used: <br /> <br /> (a) Comparable metered water use data from analogous <br />water systems. Analogous systems are those with similar <br />characteristics, such as demographics, housing sizes, income <br />levels, lot sizes, climate, water pricing structure, water use <br />efficiency practices, use restrictions, and soils and <br />landscaping; or <br /> <br /> (b) Design criteria or guidelines in the most recent edition <br />of the department manual for design of Group A public water <br />systems. <br /> <br /> (4) The design for water systems based upon metered <br />water use records shall have an MDD no lower than three <br />hundred fifty gallons per day per equivalent residential unit <br />(ERU), except for the design of any expansion to an existing <br />water system that has a minimum of two years of meter <br />records that clearly demonstrate that a lower design value for <br />MDD may be used without significant risk of pressure loss. <br />The meter records must correlate the demand data to the <br />actual level of occupancy for the periods covered by the <br />records. <br /> <br /> (5) The minimum water demand and duration required for <br />fire flow and/or fire suppression storage shall be determined <br />by the local fire control authority or chapter 246-293 WAC <br />for systems within the boundaries of a designated critical <br />water supply service area (CWSSA). Public water systems <br />that are not required to comply with minimum fire flow <br />standards shall coordinate with the local fire control <br />authorities to ensure that any hydrants on the system, if they <br />can possibly be used in the course of fire suppression <br />activities, do not create adverse pressure problems within the <br />water system as a result of fire control actions. <br />90.44 <br />Regulation of <br />public ground <br />waters (exempt <br />wells) <br />Allows withdrawal of public ground waters for stock <br />watering purposes, or the watering of a lawn or a <br />noncommercial garden not exceeding ½ acre in area or for <br />single or group domestic uses in an amount not exceeding <br />5000 gallons a day. Authority granting Department of <br />Ecology to require water metering as well.