The following list includes sampling times, results, mcl levels, lod levels, and suspected health effects.
Antimony: 1994 results = nd, 2003 results = nd, mcl = 6 ppb, lod = 6 ppb, blood effects, lower life span.
Arsenic: 1982 = 4 ppb, 1983 = nd, 1986 = 3.7 ppb, 1989 = 4.5 ppb, 1992 = 4.2 ppb, 1994 = nd, 1998=15 ppb, 2003 = 8.6 ppb, 2006 = 2.7 ppb, mcl = 50 ppb, lod = 0.2 ppb, skin and nervous system effects.
Barium: 1982 = 0.22 ppm, 1983 = nd, 1986 = 0.18 ppm, 1989 = 0.17 ppm, 1992 = 0.16 ppm, 1994 = nd, 1998 = 0.24 ppm, 2003 = 0.26 ppm, 2006 = 0.281 ppm mcl = 2.0 ppm, lod = 0.01 ppm, circulatory system effects.
Beryllium: 1994 = nd, 1998 = nd, 2003 = nd, 2006 = nd, mcl = 4 ppb, lod = 0.3 ppb, carcinogen, bone and lung effects.
Cadmium: 1982 = nd, 1983 = nd, 1986 = nd, 1989 = nd, 1992 = nd, 1994 = nd, 1998 = 1.6, 2006 = nd, mcl = 5 ppb, lod = 1 ppb, kidney effects.
Chromium: 1982 = nd, 1983 = nd, 1986 = nd, 1989 = nd, 1992 = nd, 1994 = nd, 1998 = nd, 2003 = 5.7 ppb, 2006 = nd, mcl = 100 ppb, lod = 0.1 ppb (depending on method), liver, kidney and circulatory effects.
Mercury: 1982 = nd, 1983 = nd, 1986 = nd, 1989 = nd, 1992 = nd, 1994 = nd, 1998 = nd, 2003 = nd, 2006 = nd, mcl = 2 ppb, lod = 0.1 ppb, kidney and cns effects.
Manganese: 1982 = 120 ppb, 1983 = 100 ppb, 1986 = 90 ppb, 1989 = 120 ppb, 1992 = 120 ppb, mcl = 200 (secondary, unregulated), lod = 10 ppb, nervous system effects.
Nickel: 1994 = nd, 1998 = nd, 2003 = 0.0068 ppm, 2006 = 0.008 ppm, mcl = 0.1 ppm, lod = 0.001 ppm, liver and nervous system effects.
Selenium: 1982 = nd, 1983 = nd, 1986 = nd, 1989 = nd, 1992 = nd, 1994 = nd, 1998 = nd, 2003 = nd, 2006 = nd, mcl = 50 ppb, lod = 0.7 ppb, nervous system effects.
Silver: 1982 = nd, 1983 = nd, 1986 = nd, 1989 = nd, 1992 = nd, 1994 = nd, 1998 = nd, mcl = 50 ppb, lod = 10 ppb, argyria, kidney, liver, and spleen effects.
Thallium: 1994 = nd, 1998 = nd, 2003 = nd, 2006 = nd, mcl = 2 ppb, lod = 0.4 ppb, kidney, liver, brain, intestine effects.
Zinc: 1983 = 0.05 ppm, mcl = 5 ppm (secondary, non-regulated), lod 0.01 ppm, a nutrient, can cause bitter taste.
Edited 05/27/2007