NO3 (Nitrate) by year (mg/L). Interpolated values are in italics.
1972
0.75
1973
0.9
1974
0.56
1975
0.65
1976
0.6
1977
0.6
1978
0.3
1979
0.3
1980
0.4
1981
0.6
1982
0.6
1983
0.6
1984
0.6
1985
0.6
1986
0.6
1987
0.5
1988
0.3
1989
0.6
1990
0.33
1991
1.1
1992
0.2
1993
0.91
1994
0.7
1995
0.82
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