Water supply systems in Sonoma County are of two basic types: (1) multiple service connection systems served by surface and/or ground water; and ( 2) individual domestic wells. The first type is discussed below; the latter type is discussed in Chapter V.
In 1970, Sonoma County had a population of 204,885. Of this number, 99,171, or 48.5 percent, lived within the boundaries of incorporated cities and thus received piped water. Each of the eight incorporated cities in Sonoma County operates its own municipal water system. The total number of municipal service connections for these systems is 37,669, and the total annual water demand on these eight systems exceeds 20,000 acre-feet (24.6 cubic hectometers). This demand is met with ground water and also with surface water provided by the Sonoma County Water Agency.
Twenty-one commercial water companies operate in the county. These range from large municipal operations, such as at Guerneville, which has 3,100 service connections, to small systems having less than 50 service connections. The commercial systems rely principally on ground water, although some surface water is used; their total annual water demand is nearly 4,000 acre-feet (4.9 hm^3).). The commercial systems have a total of 3,733 service connections.
There also are 112 other water systems in the county. These include one public utility district, three county water districts, 38 private water systems, 68 mutual water companies, and 50 mobile home park systems.
Data for all water systems in Sonoma County, except the mobile home park systems, are presented on Table 4. Data for the mobile home park systems are presented on Table 5. Figure 8 shows the present and proposed service areas for all water systems having greater than 150 service connections. Also shown on the figure are the locations of all small water systems (those with less than 150 service connections), as well as all mobile home park systems.
click here for the map of west side Water Service Areas FIGURE8A.JPG
click here for the map of east side Water Service Areas FIGURE8B.JPG
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