DISSOLVED CHLORIDE

The measurements shown below were made at USGS station 01209710, located on the Norwalk River near the Perry Avenue bridge. All of the measurements are in milligrams per liter, as Cl. For details about the data, press here.

The highest reading, 98, occurred in 1/90, and the lowest, 3.2, in 2/94. All of the readings above 46 (12 percent of the samples), are shown in red and all that are below 25 (another 12 percent), are in blue.

 Averages by
Season and by
5-year Period:
 
(Overall = 36.1)
Jan-Mar41.4
Apr-Jun 33.8
Jul-Sep 36.2
Oct-Dec 34.2
1980-84 31.0
1985-89 37.6
1990-94 37.9
1995-99 41.6

YearJanFebMar AprMayJunJulAug SepOctNovDec
1980                   39 40 42
1981 43 46 31 25 27 35 32 37 39 36 29 42
1982 31 36 36 35 30 16 31 34 33 47 37 34
1983 17   25 16 24 24 32 30 34 20 22 21
1984 57   32 17 26 25 15 27 24 29 25 20
1985 41   38 33 31 31 32 33 29 33 25 36
1986 38   44 38 40 38 31 32 35 42 45 37
1987 51   34 33 33 41 46 36 34 32 45 35
1988 51   40 43 43 40 45 48 32 20 47 46
1989     46 36 30 24 37 41 32 26 29 34
1990 98   47 36 40 37 41 28 43 16 31 28
1991 9.4   35 42   21 45 41 38 48 38 33
1992 39   41 37 39 31 38 32 35 35   35
1993   35 65
34
29		 36
34
30
33		 33
35
36
39		 37
42
41
38
37		 47
39
44
41		 36
13		 46
39
40
33
27		 34
30
43
48		 46
46		 24
52
1994 42 3.2
47		 39
40
31		 35
40
32
40		 41
39
28
36
42		 45
29
35
44		 42
42
44
23		 36
39
39
42
27
36		 43 45 44 29
1995 32 40 40 42 49 36 42
35		 45 26 37    
1996 78 73   43   41 49 53 36 25   24
1997   41   35 32 43 30 46 48