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<br />consumptive-use-ratio estimate used by the State Engineer's Office and is <br />similar to the consumptive-use ratio used by engineers when designing septic <br />systems. <br /> <br />Domestic water use amounted to 473 million gallons per day during 1985, <br />an average of 146 gallons per person per day. Domestic use ranged from 0.11 <br />million gallons per day in Hinsdale County to 79.4 million gallons per day in <br />Denver County. The percentage of the county population that uses self- <br />supplied domestic water ranged from zero percent in Denver County to 80 <br />percent in Park County (fig. 6). About one-third of domestic water is <br />consumptive use, mostly by lawn watering. Tabular summaries of domestic <br />water use are listed in table 6 (for counties) and table 17 (for hydrologic <br />subregions) in the "Supplemental Data" section at the back of this report. <br /> <br />Industrial Water Use <br /> <br />Industrial water use consists of water used by manufacturing facilities <br />including facilities that produce food and kindred products, steel, chemical <br />and allied products, paper and allied products, and machinery. This also <br />includes printing and publishing facilities and petroleum refining. It does <br />not include power generation, the mining of minerals, or the extraction of <br />crude petroleum and gasses, which are separate water-use categories. Data <br />were compiled for this category for water-source type, water-supply method, <br />and water-disposition type. <br /> <br />Data about deliveries to industrial users were obtained from public- <br />supply systems. Self-supplied industries were identified using several <br />sources of information. The 1986-87 Directory of Colorado Manufacturers <br />(University of Colorado Bureau of Business Research, 1986) lists manufacturers <br />in Colorado, their locations, and approximate number of employees. The <br />principal industry groups in the State (in order of number of employees) are <br />machinery (except electrical), food and kindred products, electric and <br />electronic equipment, and printing and publishing (University of Colorado <br />Bureau of Business Research, 1986, p. viii). However, the principal <br />water-using industry groups in the nation are chemical and allied products, <br />paper and allied products, primary metal industries, and petroleum and coal <br />products (U.S. Bureau of the Census, 1986, p. 6-3). Therefore, industrial <br />facilities from these eight groups that had more than 50 workers were added to <br />the water-use data base (650 facilities). Of these, attempts were made to <br />contact all facilities employing more than 250 workers (100 facilities). <br />Although the response rate of the survey was less than 50 percent, two trends <br />were discovered: the large majority of industrial users were supplied by <br />public-supply systems, and consumptive water use was small, averaging about 15 <br />percent of water used. Self-supplied industrial water users also were located <br />using three additional sources of data: (1) The discharge permit file from <br />the Colorado State Department of Health, (2) the well-permit data base from <br />the State Engineer's Office, and (3) the surface-water-diversion data base <br />from the State Engineer's Office. Where site-specific information was not <br />available, the following estimates were made: (1) 80 percent of the non- <br />contacted industries in a county cataloging unit were assumed to use public- <br />supplied water, (2) self-supplied industrial withdrawals were estimated using <br />employee-use ratios developed for the various industry groups as part of a <br /> <br />16 <br />