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52 <br />• The most recent geologic atlas is over 20 years old <br />Aquifer uncertainty varies throughout the region, primarily driven by differences in available data. <br />Where wells have been drilled, for example, more data exists to support geologic mapping and other <br />water supply assessments. Figure 23 shows the locations of: <br />• DNR observation wells (black circles) <br />• MDH aquifer tests conducted by the Minnesota Department of Health (blue triangles), and <br />• Counties with geologic atlases that are over 20 years old (yellow) <br />Figure 24. Indicators of uncertainty about aquifer sustainability. <br />A Aquifer Test (MDH) <br />. Groundwater level <br />monitoring well (DNR) <br />Counties with Geologic <br />Atlases over 20 Years Old <br />DAKOTA - Updated in 1990 <br />HENNEPIN - Updated in <br />1989 <br />RAMSEY - Updated in 1992 <br />WASHINGTON - Updated <br />in 1990 <br />r <br />• <br />A <br />A <br />• <br />•• <br />• • <br />• r <br />■ 411A <br />■ <br />• <br />r <br />A <br />4 <br />Mti p ROPO LITAN <br />C <br />• •S. <br />. A r A- A <br />41 <br />• r _ • 4.1• <br />• • so <br />r <br />••r•• • t�# <br />•ATi <br />■ <br />•A • <br />A <br />•• • iv A <br />• A <br />• •r•SO A <br />lid <br />1446.117 <br />'ef l • • <br />A • L .M `A' •r •.: <br />• <br />• PA. 90 • <br />• r • ••• •~ <br />1 • <br />• <br />r <br />A <br />• <br />0 5 10 <br />20 Miles <br />•fib . 1 <br />• <br />a <br />Reliability of water sources <br />Fifty-two communities in the metropolitan area use only one source (either groundwater or surface <br />water) to supply all of their water demand. Major sources in the region include the Mississippi River, <br />four major aquifers, and potentially the reuse of stormwater and wastewater. <br />While communities already implement federal and state regulations and programs to identify and <br />establish protocols for protecting the safety, security and reliability of their water supplies, there may <br />be opportunities in some areas to improve the protection of water supplies as a priority for ensuring <br />water supply reliability in the region. <br />WATER SUPPLY MASTER <br />PLAN- Draft June 2015 <br />