alma: Future-Oriented Management of Contaminated Sites

After a long period of preparation and more than a year of programming, we finally succeeded in September 2025. Together with the canton of Schwyz, we were able to migrate the first office to the new alma software as the successor to Altlast4Web.

Proven technology reimagined

For more than 15 years, Altlast4Web had been used by numerous cantonal offices, federal authorities and the Principality of Liechtenstein as the central software solution for managing the cadastre of contaminated sites (KbS). Although we had carried out constant updates, extensive refactoring had never taken place. The fact that 15-year-old front-end technologies were still working at all was therefore something of a minor miracle. However, maintenance of the software was becoming increasingly complex, so that at some point we reached a stage where we could no longer promise regular security-related updates with a clear conscience.