DISSOLVED ORTHO PHOSPHOROUS

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 P. For details about the data, press here.

The highest reading, .26, occurred in 12/93, and the lowest, <.01, in 4/88. All of the readings above .05 (14 percent of the samples), are shown in red and all that are below <.01 (another 29 percent), are in blue.

 Averages by
Season and by
5-year Period:
 
(Overall = 0.024)
Jan-Mar0.012
Apr-Jun 0.020
Jul-Sep 0.033
Oct-Dec 0.028
1980-84 0.000
1985-89 0.029
1990-94 0.020
1995-99 0.024

YearJanFebMar AprMayJunJulAug SepOctNovDec
1988       <.01
<.01		 <.01
.05		 .03
.02		 .03
.1		 <.01
.02		 .02 .01
<.01		    
1989 .02 .03
.02		 .04
.02		 .02
<.01		 .02
.05		 .05
.05		 .05
.05		 .04
.04		 .04
.05		      
1990   <.01
<.01		 <.01
<.01		 <.01
<.01		 .03
.03		 .02
.01		 .06
.03		 .05
.06		 .03
.03		 .01
.02		 .05
.01		 <.01
<.01
1991                        
1992                        
1993   <.01 <.01
<.01
<.01		 <.01
<.01
.01
<.01		 <.01
<.01
.02
.02		 .02
.03
.02
.02
.02		 .02
.02
.02
<.01		 .03
.01
<.01		 .02
.02
<.01
.02
.01		 .01
<.01
<.01
.03		 .02
<.01		 .03
.26
1994 .02 <.01
.01
.01		 <.01
<.01
.01		 <.01
<.01
<.01
<.01		 .01
<.01
.02
.03
.01		 <.01
.01
.04		 .05
.05
.04
.04		 .08
.03
.02
.02
.07
.03		 <.01 .01 <0.01 .02
1995 .01 .02 <0.01 .02 .02 .07 .02
.05		 .02 .02 .07    
1996 .01 .01   <0.01   .03 .04 .04 .07 .02   .01
1997   <.01   .01 .012 .017   .02 .014