. Journal of the New England Water Works Association . he quality of a water is determined by the amount and nature ofpolluting materials it may contain. These substances are those naturallyinherent in the water, which it has taken by contact and holds in a dissolvedor suspended state, and the added impurities due to the discharge into themof domestic and industrial wastes. To determine the degree of pollution, it is necessary to know theamount and character of the suspended wastes, the dissolved matter —both mineral and organic — microscopic organisms and bacteria. For theuse of water by indu
. Journal of the New England Water Works Association . he quality of a water is determined by the amount and nature ofpolluting materials it may contain. These substances are those naturallyinherent in the water, which it has taken by contact and holds in a dissolvedor suspended state, and the added impurities due to the discharge into themof domestic and industrial wastes. To determine the degree of pollution, it is necessary to know theamount and character of the suspended wastes, the dissolved matter —both mineral and organic — microscopic organisms and bacteria. For theuse of water by industries we are mostly interested in the mineral content, 18 POLLUTION OF STREAMS. though in some cases the organic nitrogen and bacteria may have a seriouseffect upon the manufactured product. Complete mineral analyses of therivers of the state are very few, and where taken have generally been ofseparate samples, and not of samples collected over any extended our work, we took full sanitary analyses of the Naugatuck and Hocka- BRIDGEPORT. ?O/YG /SLA^V NAUGATUCK RIVER m? or wemd num rivers over a considerable period; and on the Naugatuck we havefrom records of factories full mineral analyses for similar points on theriver, though taken at an earlier date. The results of these analyses aregiven in the following tables. JACKSON. 19 Number 1 in Table 1 is of the Naugatuck River at Torrington, beforeits use by the factories. Number 2, after the river has received the wastes of Torrington,Thomaston, and WatervUle, and has undergone whatever self-purificationtakes place before its use at Waterbury. Number 3 is from the river a1 Waterbury, a little lower down. Number 4 is from the Mad River, which enters the Naugatuck nearwhere Number 3 was taken. Number 5 is from the river above Ansonia and before its use by thefactories of that city. Number G is from the municipal supply at Ansonia and is introducedfor purpose of comparison. The analyses were taken monthly, May 1912, to
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