DISSOLVED COPPER
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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 Cu.
For details about the data, press here. The highest reading, 42, occurred in 11/80, and the lowest, <1.0, in 3/84. All of the readings above 9.0 (10 percent of the samples), are shown in red and all that are below 1.0 (another 22 percent), are in blue. |
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Averages by Season and by 5-year Period: (Overall = 4.40) |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1980 | 30 | 42 | 17 | |||||||||
| 1981 | 22 | 10 | 6.0 | 3.0 | 4.0 | 8.0 | 6.0 | 6.0 | 20 | 18 | 5.0 | 3.0 |
| 1982 | 3.0 | 8.0 | 3.0 | 18 | 4.0 | 9.0 | 7.0 | 4.0 | 9.0 | 5.0 | 7.0 | 5.0 |
| 1983 | 2.0 | 3.0 | 12 | 8.0 | 10 | 19 | 5.0 | 5.0 | 4.0 | 4.0 | 5.0 | |
| 1984 | 7.0 | <1.0 | 2.0 | 3.0 | 6.0 | 3.0 | 10 | 6.0 | 9.0 | 2.0 | 5.0 | |
| 1985 | 4.0 | 5.0 | 3.0 | 4.0 | 4.0 | 12 | 7.0 | 6.0 | 5.0 | 4.0 | 2.0 | |
| 1986 | 7.0 | 3.0 | 3.0 | 2.0 | 3.0 | 10 | 2.0 | 4.0 | 6.0 | 5.0 | 3.0 | |
| 1987 | 4.0 | 4.0 | 3.0 | 2.0 | 4.0 | 1.0 | 4.0 | 4.0 | 1.0 | 3.0 | 1.0 | |
| 1988 | 3.0 | 8.0 | 4.0 | 3.0 | 3.0 | 4.0 | 6.0 | 6.0 | 6.0 | 4.0 | 7.0 | |
| 1989 | 1.0 | 4.0 | 2.0 | 7.0 | 3.0 | 4.0 | 5.0 | <1.0 | 2.0 | 3.0 | ||
| 1990 | <2.0 | <2.0 | <2.0 | 3.0 | 4.0 | 3.0 | 4.0 | 3.0 | 2.0 | 1.0 | 2.0 | |
| 1991 | 1.0 | 1.0 | 2.0 | 1.0 | 7.0 | 2.0 | 3.0 | 3.0 | 2.0 | 1.0 | ||
| 1992 | 1.0 | 1.0 | 1.0 | 1.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 1.0 | ||
| 1993 | 1.0 | 1.0 | 1.0 | 1.0 | 2.0 | 2.0 | 1.0 | |||||
| 1994 | <1.0 | 3.0 | 1.0 | 2.0 | 1.0 | 1.0 | <1 | <1 | ||||
| 1995 | 1 | 1 | 2 | 2 | 1 | 1 | 3.0 | |||||
| 1996 | 3.0 | 2.0 | 2.0 | 3.0 | 1.0 | 2.0 | 2.0 | 2.0 | <1.0 | |||
| 1997 | <1.0 | 1.2 | 2.0 | 1.8 | 2.3 | 1.5 |
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