NO3 (Nitrate) by year (mg/L). Interpolated values are in italics.
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
0.4
1987
0.4
1988
0.4
1989
0.6
1990
0.77
1991
1.3
1992
1.0
1993
1.1
1994
1.2
1995
1.02
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