TOTAL AMMONIA PLUS ORGANIC

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, 2.1, occurred in 3/90, and the lowest, <.1, in 11/82. All of the readings above .7 (13 percent of the samples), are shown in red and all that are below <.2 (another 14 percent), are in blue.

 Averages by
Season and by
5-year Period:
 
(Overall = 0.451)
Jan-Mar0.442
Apr-Jun 0.443
Jul-Sep 0.443
Oct-Dec 0.478
1980-84 0.584
1985-89 0.502
1990-94 0.313
1995-99 0.327

YearJanFebMar AprMayJunJulAug SepOctNovDec
1980                   .61 .34 .24
1981 .5 .64 1.5 .39 .59 .52 .64 .51 .36 .5 .44 .61
1982 1.4 .32 .59 .38 .44 .1 .4 .4 .7 1.3 <.1 .6
1983 .3   .3 .4 .2 .5 .5 .8 .4 1.2 .7 .9
1984 1.3   .2 .5 2.0 .7 .4 .6 .7 .7 .5 .3
1985 <.2   .5 .2 .4 .4 .4 .4 .6 .2 .4 .2
1986 .5   .4 .4 .4 .6 .5 .4 .3 .4 .8 1.2
1987 .7   .7 .3 1.1 .3 .8 .5 .5 .3 .6 1.4
1988 .7   .5 .3
.5		 .4
.6		 .4
.4		 .8
1.1		 .5
.2		 .5 .5
.3		 .5 .5
1989 .5 .3
.4		 .4 .7
.5		 .3
.4		 .6
.4		 .5
.3		 .7
.3		 .7
.6		 .6 .5 .9
1990 .2 <.2
.4		 2.1
.3		 <.2
.5		 .3
.4		 .7
.4		 .8
.6		 .6
.5		 .5
.4		 .4
.6		 .3
<.2		 .8
.3
1991 .3   .3 .5   .6 .6 .4 .3 .4 .2 <.2
1992 <.2   .3 <.2 .3 .4 <.2 .3 .2 <.2   <.2
1993     .2
.2
.3		 <.2
.2
.3
<.2		 .4
.3
.2
.2		 .6
.3
.3
.4
.4		 .3
<.2
.4
.5		 <.2
.4
<.2		 .4
.4
<.2
<.2
.4		 .3
<.2
.2
.5		 .2
.2		 .3
.4
1994 <.2 <.2
<.2
<.2		 <.2
<.2
<.2		 .2
<.2
<.2
.4		 .4
.4
.5
.3
.3		 .4
.3
.6		 .4
.4
.3
.6		 .4
.4
.4
.4
.5
.3		 .2 .3 <0.2 .2
1995 <0.2 <0.2 .3 .2 1.3 .4 .2
.2		 .4 .2 .4    
1996 .2 .4   .2   .6 .7 .3 .4 .3   .3
1997   <.2   <.2 <.2 .25   .25 <.2