Coverage
Where we already have source-documented analysis results. We are covering Germany step by step — beginning with the major cities and North Rhine-Westphalia — plus Austria and Italy.
On Austria: there are no openly licensed area boundaries for Austrian postcodes. Marked are therefore the municipalities in which a recorded postcode lies — the coloured area is thus larger than the area for which we have values. Clicking leads to the postcode. All recorded areas are listed in the Austria overview.
On Italy: what is marked are Comuni, not postcodes — open areas for the five-digit CAP do not exist. A click leads to the Comune; searching by CAP is still possible. All recorded ones are listed in the Italy overview.
Germany
- People in the covered area
- 71 million
- Cities & municipalities
- 4,414
- Postcodes
- 6,023
- Suppliers with data
- 2,700
- Measured values
- 410,433
Austria
- Cities & municipalities
- 800
- Postcodes
- 863
- Suppliers with data
- 387
- Measured values
- 64,618
Italy
- Comuni
- 1,892
- Gestori
- 35
- Measured values
- 190,970
Area boundaries Germany derived from © OpenStreetMap contributors (ODbL), Municipal boundaries Austria: STATISTIK AUSTRIA, Division of Austria into municipalities (CC BY 4.0), Municipal boundaries Italy: ISTAT (territorial status 01.01.2026, CC BY 4.0), As of 28/08/2026. The map shows coverage, not water quality — values per postcode via the postcode search.