TOTAL NITRITE PLUS NITRATE

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 N. For details about the data, press here.

The highest reading, 2.7, occurred in 8/85, and the lowest, .09, in 5/92. All of the readings above .8 (12 percent of the samples), are shown in red and all that are below .2 (another 11 percent), are in blue.

 Averages by
Season and by
5-year Period:
 
(Overall = 0.500)
Jan-Mar0.707
Apr-Jun 0.377
Jul-Sep 0.489
Oct-Dec 0.472
1980-84 0.555
1985-89 0.538
1990-94 0.433
1995-99 0.000

YearJanFebMar AprMayJunJulAug SepOctNovDec
1980                   .35 .35 .78
1981 1.1 .88 .83 .42 .35 .33 .25 .12 .29 .33 .39 .83
1982 1.2 1.1 .87 .45 .35 .42 .61 .31 .51 .2 .6 .7
1983 .6   .6 .4 .3 .5 .3 .5 .2 .5 .4 .6
1984 .9   .5 .3 .2 .3 1.8 .5 .5 .5 .5 .5
1985 .7   .4 .3 .5 .6 .6 2.7 .3 .3 .4 .7
1986 .8   .7 .3 .4 .5 .4 .2 .6 .2 .4 .8
1987 .8   .6 .3 .4 .6 .4 .4 .2 .3 .3 .5
1988 .8   .7 .2
.2
.5
.5
.5
.7
.6
.4
.4
.1
.4 .3
.1
.3 1.0
1989 .7 .7
.7
.4 .3
.1
.4
.5
.4
.4
.7
.4
.3
.3
.3
.4
.3 .5 .8
1990 .9 .9
.6
.2
.5
.4
.3
.3
.5
.6
.6
.5
.5
.6
.5
.3
.3
.4
.3
.6
.5
.3
.5
1991 .7   .46 .17   .19 .35 .21 .24 .15 .16 .47
1992 .47   .29 .27 .09 .54 .52 .42 .49 .44   .88