Trend analysis results for pH and alkalinity, April 1983 April 2014
  All sites Ponds Streams
  pH ANC pH ANC pH ANC
Increased 45 47 21 27 24 20
Decreased 4 1 0 0 4 1
No Change 85 86 48 42 37 44
Total 134 134 69 69 65 65
SOURCE: ACID RAIN MONITORING PROJECT ANNUAL REPORT