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60 <br />Table 3 - Subregional estimate of sustainable groundwater withdrawal rates. <br />Subregion <br />Estimated <br />Sustainable <br />Groundwater <br />Withdrawal <br />Rate (MGD) <br />Difference between Estimated <br />Sustainable Groundwater <br />Withdrawal Rate and 2040 <br />Projected Groundwater <br />Withdrawal Rate <br />Key types of <br />constraints on <br />groundwater <br />availability <br />North and East <br />115 <br />Approaching <br />Groundwater -surface <br />water interaction, safe <br />yield <br />Southeast <br />130 <br />Approaching or Exceeds <br />Groundwater -surface <br />water interaction, safe <br />yield <br />Southwest <br />4 <br />Approaching <br />Groundwater -surface <br />water interaction <br />Northwest <br />140 <br />Approaching <br />Groundwater -surface <br />water interaction, safe <br />yield <br />North <br />20 <br />Below <br />Groundwater -surface <br />water interaction <br />West <br />15 <br />Below <br />Groundwater -surface <br />water interaction <br />The information presented above is a general estimate of the amount groundwater sustainably <br />available in different parts of the Twin Cities metropolitan area. This information is intended to inform <br />regional and sub -regional planning activities and to help track progress toward regional goals. At this <br />scale, this information is not appropriate for using in local permit decisions. More information about <br />the method used for this estimates is in Appendix 4. <br />Supporting Outcomes <br />Water conservation <br />Desired Outcomes: <br />That, as a region, the average total municipal (including residential, commercial, and industrial) per <br />capita water use is 90 gallons or less per person per day; the ratio of summer to winter monthly water <br />use is equal to or less than the 1990-1994 average ratio as discussed in Chapter 3; and the per capita <br />residential water use is equal to or less than 75 gallons per capita per day. <br />Based on its policy on water conservation and reuse, the Council will work with partners to identify <br />emerging issues and challenges for the region and to work together on solutions that include the use <br />of water conservation. <br />Analysis of historical and projected water use and population data shows that decreasing the average <br />total municipal per capita water use to 90 gallons per person per day, 2040 population growth could <br />occur with no regional increase in water use by municipal public water supply systems. <br />WATER SUPPLY MASTER <br />PLAN- Draft June 2015 <br />