studied waterfront residential
properties located along small rivers and streams in Pennsylvania
and found that pH levels low enough to limit recreational
use do affect housing prices. They found that acidity
from minerals and carbon dioxide, which affects pH levels,
significantly influenced housing prices. In addition to testing
individual water quality measures, Epp and Al-Ani performed
regressions with a dummy variable that classified streams as
clean or polluted based on standards set by the United States
Environmental Protection Agency.