DISSOLVED 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, 2.0, occurred in 12/93, and the lowest, <.05, in 8/93. All of the readings above .72 (9 percent of the samples), are shown in red and all that are below .17 (another 9 percent), are in blue.

 Averages by
Season and by
5-year Period:
 
(Overall = 0.470)
Jan-Mar0.684
Apr-Jun 0.446
Jul-Sep 0.378
Oct-Dec 0.412
1980-84 0.000
1985-89 0.447
1990-94 0.469
1995-99 0.526

YearJanFebMar AprMayJunJulAug SepOctNovDec
1988       .19
.2		 .45
.52		 .48
.74		 .61
.41		 .36
.13		 .37 .31
.11		    
1989 .75 .63
.7		 .33
.36		 .35
.11		 .34
.48		 .41
.44		 .72
.49		 .34
.28		 .38
.29		      
1990   .94
.69		 .2
.5		 .4
.3		 .3
.5		 .6
.6		 .5
.4		 .6
.5		 .4
.3		 .3
.3		 .5
.6		 .3
.5
1991                        
1992                        
1993   .67 .69
.61
.59		 .46
.41
.35
.18		 .18
.3
.62
.7		 .38
.63
.64
.61
.59		 .34
.23
.21
.15		 .37
.06
<.05		 .51
.55
.4
.52
.37		 .48
.24
.06
.17		 .3
.53		 .44
2.0
1994 .86 .17
.85
.83		 .65
.61
.54		 .51
.41
.3
.24		 .18
.31
.3
.32
.31		 .56
.48
.46		 .26
.29
.43
1.1		 .32
.18
.14
.24
.59
.29		 .08 .21 .09 .48
1995 .58 .85 .58 .44 .57 .52 .42
.47		 <0.05 .33 .17    
1996 .83 .95   .31   .89 .6 .31 .41 .42   .65
1997   .86   .45 .245 .602   .572 .529