Company founded by builder Josef Stoiser and architect Carl Wolscher

Start of mechanical wastewater treatment plant manufacturing

First biological wastewater treatment plants manufactured

Start of oil separator production

First acquisition: ISO SPAN Baustoffwerke GmbH, Ramingstein

Launch of activities in Hungary (via UAB holding)

Expansion in Hungary through the acquisition of the Rocla-Hungaria Kft. works in Budapest and Mibet in Miskolc

Further acquisitions in Austria: Eurospan Naturbaustoffe GmbH and Betonwerk Nageler GmbH

IPO on the Vienna Stock Exchange

Acquisition of Biogest Abwassertechnik GmbH, Vienna and OMS Hungaria Kft., Hungary

Acquisition of Strong Kft and merger with Mibet Kft.

Acquisition of Stadlbauer Umwelttechnik GmbH

First German acquisition: Merbeler Umwelttechnik GmbH

Construction of the south Budapest factory

Startup with renewable energies/ biogas

Construction of Hungary’s most modern pipe works at the South Budapest site

Ground-breaking for the first production site in Romania (Orţişoara)

Ground-breaking for the second production site in Romania (Izvoru, near Bucureşti)

Start of production (products for waste water, tubes) in Orţişoara

Start of production (precast parts and floor slaps) in Izvoru

Restructuring in Hungary

100 years of SW Umwelttechnik