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<br />A knowledge of the basis for making some of the estimates <br />may be useful to those readers concerned with the limitations of <br />the data. The estimates explained in the following discussion <br />are those considered to be most significant. <br /> <br />The reported pOpulation was taken from the 1960 census for <br />all incorporated communities and all unincorporated communities <br />having a population of 1,000 or more. The population was esti- <br />mated for smaller unincorporated communities, generally by one <br />of the residents--oftentimes the postmaster. <br /> <br />The pOpulation served by individual water-supply systems <br />was estimated from a variety of information. The estimate of <br />the pOpulation served for a community whose sole source of supply <br />is a community system was the u.s. census population, when it was <br />known that the system served only residents within the corporate <br />limits. Where the water-supply system extends beyond the corporate <br />limits, the suburban population served was estimated from the <br />number of suburban service connections and an estimate of the <br />number of persons served per service connection (commonly two or <br />three persons). The estimate of the pOpulation served for a <br />community having a large number of individual supplies was based <br />on the best information available, usually the number of service <br />connections and an estimate of the number of persons served per <br />service connection. <br /> <br />. <br /> <br /> <br />28 <br />