Water quality in Hungarian communities

I've started investigating the quality of drinking water in Hungary.

I got a detailed list of water sources for more than 500 Hungarian communities. The list is attached, and it shows, among other things, how deep the well of each community is, how long the water has been under testing (generally since the early 1990's), and the source of the water:

• karst - landscape formed from the dissolution of soluble rocks such as dolomite, limestone, and gypsum
• partiszűrésű víz - water which is strained through riverside gravel (link to a Hungarian language article about riverside gravel-strained water)
• talajvíz - groundwater, underground water, subsoil water