DISSOLVED CADMIUM

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 micrograms per liter, as Cd. For details about the data, press here.

The highest reading, 4.0, occurred in 6/81, and the lowest, 0, in 12/80. All of the readings above 1.0 (16 percent of the samples), are shown in red and all that are below <1.0 (another 84 percent), are in blue.

 Averages by
Season and by
5-year Period:
 
(Overall = 0.611)
Jan-Mar0.645
Apr-Jun 0.667
Jul-Sep 0.560
Oct-Dec 0.589
1980-84 0.798
1985-89 0.553
1990-94 0.506
1995-99 0.511

YearJanFebMar AprMayJunJulAug SepOctNovDec
1980                   1.0 1.0 0
1981 3.0 0 0 0 0 4.0 1.0 <1.0 <1.0 <1.0 <1.0 <1.0
1982 <1.0 <1.0 <1.0 1.0 <1.0 1.0 1.0 <1.0 <1.0 1.0 <1.0 2.0
1983 1.0   <1.0 1.0 1.0 1.0 <1.0 1.0 1.0 <1.0 <1.0 1.0
1984 1.0   2.0 <1.0 <1.0 <1.0 1.0 <1.0 <1.0 1.0 <1.0 <1.0
1985 <1.0   1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
1986 <1.0   <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
1987 <1.0   <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
1988 <1.0   <1.0 <1.0 <1.0 2.0 <1.0 1.0 <1.0 <1.0 1.0 <1.0
1989     <1.0 <1.0 1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
1990 <1.0   <1.0 <1.0 1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
1991 <1.0   <1.0 <1.0   <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0
1992 <1.0   <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0   <1.0
1993   <1.0   <1.0   <1.0 <1.0   <1.0 <1.0   <1.0
1994   <1.0   <1.0   <1.0 <1.0 <1.0 <1.0 <1.0   <1.0
1995   <1.0   <1.0   <1.0 <1.0 <1.0 <1.0 <1.0    
1996 <1.0 <1.0   <1.0   <1.0 <1.0 <1.0 <1.0 <1.0   <1.0
1997   <1.0   <1.0   <1.0 <1.0 <1.0 <1.0