DISSOLVED SULFATE

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 SO4. For details about the data, press here.

The highest reading, 64, occurred in 1/87, and the lowest, 7.5, in 8/93. All of the readings above 27 (11 percent of the samples), are shown in red and all that are below 14 (another 16 percent), are in blue.

 Averages by
Season and by
5-year Period:
 
(Overall = 20.1)
Jan-Mar21.1
Apr-Jun 17.7
Jul-Sep 20.3
Oct-Dec 21.6
1980-84 23.1
1985-89 21.1
1990-94 18.2
1995-99 16.7

YearJanFebMar AprMayJunJulAug SepOctNovDec
1980                   33 34 44
1981 38 32 27 24 22 24 20 26 22 31 28 20
1982 24 23 23 22 21 13 21 26 25 31 19 19
1983 14   19 12 16 19 23 22 26 31 27 19
1984 22   16 14 19 20 17 20 22 24 21 22
1985 23   20 21 37 17 22 18 19 20 16 15
1986 16   17 16 21 21 22 22 24 21 21 21
1987 64   19 18 19 21 20 22 19 22 18 18
1988 24   19 20 19 20 29 27 23 12 28 23
1989     21 19 16 13 19 22 23 14 16 21
1990 20   17 16 17 15 17 16 19 9.0 16 14
1991 23   15 17   8.3 26 23 21 20 20 21
1992 20   21 18 20 17 19 15 18 17   18
1993   20 15
12
12		 15
14
13
14		 14
15
15
18		 13
18
18
20
17		 21
18
24
22		 26
7.5		 25
27
23
18
33		 30
32
37
43		 40
36		 22
18
1994 22 8.1
21		 15
16
13		 15
16
14
16		 16
15
12
15
17		 18
13
16
14		 15
15
16
14		 11
14
15
14
10
13		 18 17 16 14
1995 13 16 16 16 15 16 18
16		 21 15 27    
1996 21 16   15   15 17 16 14 13   13
1997   15   15 14 17 13 19 21