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2018 MS4 Annual Report Chloride • MPCA Twin Cities Metropolitan Area (TCMA) - Chloride Management Plan (February 2016) • Groundwater • 1/3 of the wells showed increase in concentrations • 27% of TCMA wells were above EPA drinking water standards • 30% of TCMA wells were above chronic • water quality standards • Surface Water • 10% of surface water tested in Metro Area • (lakes, streams, wetlands) • 39 waterbodies are impaired • (Little Johanna) 0i, Li . WF;