Trend analysis results for ions and color April 1983 – April 2014 | ||||||
Increase | Decrease | No change | ||||
Mg | 2 | 4 | 19 | |||
Si | 0 | 5 | 20 | |||
Mn | 0 | 3 | 22 | |||
Fe | 0 | 5 | 20 | |||
Cu | 0 | 4 | 20 | |||
Al | 0 | 7 | 18 | |||
Ca | 3 | 6 | 16 | |||
Na | 7 | 0 | 18 | |||
K | 5 | 0 | 20 | |||
Cl | 11 | 0 | 14 | |||
NO3 | 1 | 0 | 24 | |||
SO4 | 1 | 21 | 3 | |||
color | 21 | 0 | 4 | |||
SOURCE: Acid Rain Monitoring Project Annual Report, Water Resources Research Center |