| | 1939 : | Degremont founded in Paris | France |
| | 1947 : | First subsidiary outside France | Belgium |
| | 1948 : | First international drinking water facility, Cairo | Egypt |
| | 1953 : | Drinking water facility, Jakarta | Indonesia |
| | 1956 : | First Pulsator® in a drinking water facility | France |
| | 1967 : | Degremont joins the Lyonnaise des eaux group | |
| | 1975 : | First reverse osmosis desalination plant (200,000 m3/day), Riyadh | Saudi Arabia
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| | 1985 : | First Biofor® | France |
| | 1988 : | First membrane ultrafiltration facility | France |
| | 1997 : | Lyonnaise des eaux merges with SUEZ to form SUEZ-Lyonnaise des eaux | |
| | 2002 : | World’s first hybrid desalination facility, Fujairah (ro: 170,000 m3/day, msf: 280,000 m3/day) | United Arab Emirates |
| | 2003 : | Valenton biosolids processing plant (75,000 tons/yr) | France |
| | 2004 : | World’s largest ultrafiltration facility (275,000 m3/day), Moscow | Russia |
| | 2006 : | Start-up of largest reverse osmosis desalination facility in southern hemisphere, Perth (143,000 m3/day) | Australia |
