Contains water hardness data for various springs throughout Pennsylvania. See table 3 near the back of the book.

Contains water hardness data for various aquifers in Pennsylvania. Locate the appropriate subbasin and look for a table containing water hardness data.

(Zip file) Contains descriptive information on water hardness for various rock formations in Pennsylvania. Use in conjunction with the Atlas below.

(Zip file)

Contains hardness data for large Pennsylvania lakes.

Older data but useful for river data.

Contains hardness data for selected rivers and lakes

From the Pennsylvania Geological Survey, the technical reports on the groundwater resources of areas, commonly defined on a countywide basis. Most of these reports include a book and a large-scale, full-color geologic map