TOTAL 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, .33, occurred in 6/82, and the lowest, <.01, in 3/85. All of the readings above .11 (10 percent of the samples), are shown in red and all that are below .02 (another 19 percent), are in blue.

 Averages by
Season and by
5-year Period:
 
(Overall = 0.056)
Jan-Mar0.036
Apr-Jun 0.059
Jul-Sep 0.065
Oct-Dec 0.061
1980-84 0.072
1985-89 0.057
1990-94 0.043
1995-99 0.043

YearJanFebMar AprMayJunJulAug SepOctNovDec
1980                   .06 .06 .05
1981 .05 .07 .03 .04 .08 .11 .05 .05 .03 .04 .05 .12
1982 .06 .04 .05 .02 .06 .33 .09 .13 .07 .04 .13 .21
1983 .09   .12 .06 .07 .07 .07 .03 .04 .11 .07 .04
1984 .05   .03 .05 .04 .05 .11 .11 .05 .11 .13 <.03
1985 .03   <.01 .07 .08 .13 .1 .11 .07 .05 .06 .04
1986 .04   .03 .04 .04 .09 .05 .07 .05 <.01 .07 .02
1987 .03   .08 .04 .05 .08 .02 .05 .04 .02 .04 .01
1988 .05   .03 .03
.04		 .04
.13		 .06
.05		 .1
.16		 .03
.06		 .07 .05
.02		 .09 .04
1989 .08 .04
.08		 .04 .05
.04		 .06
.07		 .12
.08		 .06
.07		 .02
.08		 .04
.09		 .11 .21 .04
1990 .03 .02
.03		 .03
.03		 .04
.03		 .06
.06		 .06
.06		 .05
.05		 .18
.12		 .05
.05		 .03
.06		 .04
.02		 .13
.03
1991 .01   .02 .07   .03 .05 .08 .05 .06 .03 .04
1992 .02   .02 .01 .01 .04 .05 .1 .05 .04   .02
1993   <.01 .02
.02		 .01
.01
.03
.03		 .03
.03
.03
.03		 .09
.06
.13
.07
.05		 .08
.06
.07
.09		 .04
.04
<.01		 .07
.07
.04
.03
.07		 .02
<.01
.03
.04		 .03
.02		 .05
.31
1994 .02 .02
.03
.03		 <.01
<.01
<.01		 .04
.02
.02
.02		 .04
.03
.07
.04
.02		 .03
.03
.09		 .08
.08
.07
.1		 .1
.07
.06
.07
.14
.05		 <.01 .01 .02 .04
1995 .02 <0.01 .05 .05 .03 .1 .04
.06		 .06 .05 .07    
1996 .01 .03   .03   .06 .16 .04 .06 .06   .02
1997   <.01   .02 .035 <.01   .025 .016