This progress, however, is inconsistent. Additional enforcement with several other Mystic municipalities, as well as the Suffolk Downs racetrack and a criminal prosecution of Exxon Mobil for a diesel spill followed. The U.S. Environmental Protection Agency (EPA), in collaboration with the Mystic River Watershed Association (MyRWA), announced its annual Water Quality Report Card on the Mystic River watershed for 2017. View an analysis of water quality trends over a ten-year period, showing areas of improvement and decline. With a local population of over 215,000 people and a tremendous influx of visitors during the summer season, it’s important to address any possible public health concerns related to our bathing waters. Mystic Lake Water Quality (We will work to maintain the Mystic Lakes' high grade) In coordination with the Mystic River Watershed Association (MyRWA), EPA is utilizing an enhanced, more locally-specific analysis of water quality in the Mystic River Watershed to … The 2018 water-quality report card for the watershed includes the Mystic River and the Mystic Lakes. In 2007, EPA gave the Mystic a D for its first water quality grade. Mystic River, Lakes rate A-, A. Mystic System Water Quality Table: > Greater than < Less than AL Action Level:The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow. However, water quality in many of the tributary streams feeding the Mystic often do not meet water quality standards. CU Color Units MCL Maximum Contaminant Level:The highest level of a contaminant that is allowed in drinking water. It also calls out the water quality improvements at Belle Isle Inlet in Revere/Winthrop, where water quality conditions moved from a C grade in 2014, a B in 2015, and an A- for 2016. If you're looking for swimming or sunbathing, check out Shannon Beach. The Mystic River Watershed is a collection of rivers, streams, lakes, and ponds that drain an area of approximately 76 square miles and 21 municipalities north of Boston. They continue to have clean water -- earning grades of A- and A, resepctively. We test routinely for over 120 potential contaminants and parameters that could affect the quality of your tap water. The Mystic System Water Quality Table: Mystic System Highest Allowed by bLaw Detected Level Substance (Units of Measure) MCLG MCL Compliance Test Date Average Range Inorganic Compounds Barium (ppm) 2 2 YES 2014/2017 0.024 0.011 –0.035 Copper (ppm) 1.3 AL = 1.3 YES 2017 0.14* Fluoride (ppm) 4.0 4.0 YES 2017 0.67 0.58 –0.91 Lead (ppb) 0 AL = 15 YES 2017 1** Nitrate (ppm) 10 10 YES … For the fourth year in a row, water quality monitoring data show that bacterial contamination in the main stem of the Mystic River, including the Upper and Lower Mystic Lakes, is … These Lakes form a critical component of the larger Mystic Watershed, which is used by citizens and visitors in many communities north of Boston for recreation and, indirectly, water supply. In addition to water quality problems, the Mystic River also faces limitations to public open space and accessibility. 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