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distribution system each spring. Water is also used in cleaning and testing all new water lines installed within the District. The amount of water used for flushing has not been measured, but is estimated to be around 1010 to 2010 of total water production. Based on that estimate, the percentage of unaccounted water use in 2006 is approximately 10010 of annual water production. Figure 4.2 shows the monthly water use by different customer categories served by ELCO. The water demand of ELCO's two wholesale customers is not included in Figure 4.2. The contracts ELCO has with its wholesale customers limits the District's ability to impose conservation measures and relieves the District of the responsibility for obtaining water rights for those customers. ELCO's wholesale customers have their own water rights, which they transfer annually to the District. Without authority to enforce conservation measures within the service areas of its wholesale customers and no obligation to secure water rights for them, the water use of ELCO's wholesale customers will be excluded from further analysis in this report. Figure 4.2 illustrates the significant demands resulting from lawn irrigation by both single family and non-residential customers. In 2006, approximately 61010 of the water used by single family customers was for lawn irrigation; approximately 49010 of the water used by non-residential customers in 2006 was for that purpose. The water demands of multi-family and mobile home customers remain relatively steady month to month. There are two reasons for that: 1) the largest mobile home parks served by ELCO provide well water to each mobile home pad for landscape irrigation, and 2) the few multi-family developments served by ELCO have non-potable irrigation systems or they have installed dedicated irrigation taps for landscape irrigation. Long established rate codes in the District's billing system currently require that the water use of irrigation taps is included in the non-residential category. Figure 4.2 - Monthly Water Use by Customer Category in 2006 140 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - en s::: .2 120 (ij C) .2 100 g 80 Q) tJ) :J 60 ~ Q) ... <<S 3: 40 ~ :E E 20 o ~ .-- -- - - ---..... - ~ - .-- - -. ~ - ~ - - - - - - -7 ~ - - - - - - - - - - - - - - - - - - - ~ -,- - - - - -- - -. - - ....... --- . . - - - ..- - - ..- - - -. - -. ..........-. .-..- -..-.-..- --- ..-- - --- --- o Jan Feb Mar Apr May Jun Jul Aug Sep Oet Nov Dee --+-Single Family - - Non-Residential -Multi-Family -..- - Mobile Homes Clear Water Solutions, Inc. East Larimer County Water District 2007 Water Conservation Plan 31