| 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 |
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