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2019 MS4 Annual Report <br />Chloride <br />• MPCA Twin Cities Metropolitan Area (TCMA) - Chloride Management Plan <br />(February 2016) <br />• Groundwater <br />• 1/3 of the wells showed increase in concentrations <br />• 27% of TCMA wells were above EPA drinking water standards <br />• 30% of TCMA wells were above chronic <br />• water quality standards <br />• Surface Water <br />• 10% of surface water tested in Metro Area <br />• (lakes, streams, wetlands) <br />• 39 waterbodies are impaired <br />• (Little Johanna) <br />