DISSOLVED 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, .27, occurred in 6/82, and the lowest, <.01, in 8/81. All of the readings above .06 (14 percent of the samples), are shown in red and all that are below <.01 (another 17 percent), are in blue.

 Averages by
Season and by
5-year Period:
 
(Overall = 0.032)
Jan-Mar0.017
Apr-Jun 0.035
Jul-Sep 0.039
Oct-Dec 0.032
1980-84 0.042
1985-89 0.031
1990-94 0.026
1995-99 0.021

YearJanFebMar AprMayJunJulAug SepOctNovDec
1980                   .04 .04 .01
1981 .03 .07 .02 .02 .03 .07 .09 <.01 .01 .02 .02 .04
1982 .03 .04 .02 .07 .02 .27 .05 .09 .04 .03 .11 .04
1983 .04   .02 <.01 .05 .04 .06 .01 .02 .06 .01 .05
1984 .03   <.01 .02 .02 .03 .11 .06 .02 .05 .07 <.01
1985 .02   <.01 .02 .03 .11 .04 .03 .05 <.01 .04 .02
1986 .02   .02 .02 .02 .04 .03 .04 .02 <.01 .05 .02
1987 .02   .01 .02 .02 .01 .02 .03 .03 .04 .04 .02
1988 .02   .02 .02
.02		 .02
.07		 .04
.06		 .07
.13		 .03
.03		 .03 .02
.01		 .08 .02
1989 .02 .02
.02		 .02 .03
.01		 .04
.06		 .06
.05		 .05
.05		 .02
.04		 .06
.06		 .05 .03 .01
1990 .01 .01
<.01		 .01
.02		 .02
<.01		 .04
.03		 .03
.03		 .03
.04		 .06
.08		 .03
.05		 <.01
.01		 .03
.01		 .01
<.01
1991 <.01   <.01 .1   .02 .03 .05 .03 .04 .01 .03
1992 .02   <.01 <.01 <.01 .03 .06 .07 .03 .04   <.01
1993   <.01 <.01
.01
.05		 .01
<.01
.05
.02		 <.01
<.01
.02
.03		 .03
.03
.03
.03
.03		 .02
.03
.02
.05		 <.01
.02
<.01		 .03
.04
.03
<.01
.02		 .02
<.01
.01
.01		 .02
<.01		 .02
.26
1994 <.01 <.01
.02
.02		 .01
<.01
<.01		 <.01
<.01
<.01
.02		 .02
.01
.02
.03
.02		 .01
<.01
.06		 .06
.05
.05
.05		 .08
.05
.07
.05
.06
.04		 <.01 .01 <0.01 .03
1995 .01 <0.01 .01 .03 .02 .07 .02
.03		 .02 .03 .06    
1996 .01 <0.01   <0.01   .04 .04 .02 .04 .03   <.01
1997   <.01   <.01 <.01 .016   .012 .02