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3 AQUARION - 2021 WATER QUALITY REPORT Stamford System PWS ID: CT 1350011 WATER QUALITY TABLE Substance (Units of Measure) MCLG MCL Compliance Test Date Average Range INORGANIC COMPOUNDS Barium (ppm) 2 2 YES 2021 0.017 0.011 - 0.018 Copper (ppm) 1.3 AL = 1.3 YES 2021 0.18*