Percentage of Surface Drinking Water from Intermittent,
Ephemeral, or Headwater Streams in Utah
Salt Lake City
West Valley City
rrovo
Key:
Intermittent, ephemeral, and
headwater stream miles as
percentage of total stream
miles contained in all SPAs
for a given county
39% - 44%
45% - 56%
57% - 69%
70% -
87% - 97%
\
Junction
B landing
Saint George
Legend: This map highlights regional patterns of dependence on intermittent, ephemeral, and headwater streams for surface drinking
water in Utah. In Utah, 6,515 total miles of streams provide water for surface water intakes supplying public drinking water systems; of this,
4,442 miles, or 68%, are intermittent, ephemeral, or headwater streams. Over 1.4 million people in Utah receive drinking water from public
drinking water systems that rely at least in part on intermittent, ephemeral, or headwater streams. This analysis compared the stream length
of intermittent, ephemeral, and headwater streams to total stream lengdi within all mapped Source Protection Areas (SPAs) for each county.
A SPA is an area upstream from a drinking water source or intake that contributes surface water flow to the drinking water intake during a
244iour period. This is based on data that generally do not include streams less than one mile in length. Intermittent streams are streams
containing water for only part of the year. Ephemeral streams flow in response to precipitation events. First-order streams have been used
to represent headwater streams.
Data Sources: National Hydrography Dataset Plus at medium resolution; Federal Safe Drinking Water Information System 4th Quarter
2006 Data.

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