ORP – Still a current action

ORP is a large operation that has lasted for more than 10 years (from 1990 to 2002). It had for objective to make the inventory of all the pipes, whose wild polluting discharges could have affected the water quality of all the rivers of the catchment basin of the Leman.


2000 volunteers thus have walked through river sectors with a kit of analyses and an identification sheet. This has allowed 8,300 km of rivers and 20,143 pipes to be inspected (see archives). On these 20,143 pipes:

  • 6,077 polluting pipes, or suspected of polluting and they have been categorised in 3 groups (2254 unmistakably polluting, 1390 much likely polluting, 2433 pollution to be confirmed)
  • 7,421 deposits of waste of all sorts.

Moreover the ASL has sent 985 detailed files to 493 Lemanic communes but also to federal, departmental and cantonal administrations.


The ASL thinks that it is important to continue to regularly keep an eye on the potentially polluting pipes, whose discharges could be poured out in the rivers of the catchment basin of the Leman.


Since 2004 the ASL organises actions “keys in hand” of approximately ½ day for companies, community centres, schools. On the menu: chose a sector, build teams, distribution of kits, hunt of polluting pipes, observation of the fauna and flora, a riddle to solve…



If you are interested by this action contact us so that we can define a preferred sector that might hide some uncontrolled pipes…

ASL goes to war against invaders

Reynoutria japonica

You may have already seen these big bushes on the shore of the lake, along a river or a slope of an embankment, made of tall stems with beautiful white flowers and immense leaves, haven’t you?

Even if we can appreciate the aesthetic of this plant, called Japanese Knotweed, it is not indigenous at all. Its pioneer aspect enables it to survive easily at the native ones’ cost.

Indeed it presents a powerful capacity to incurably invade fields and prevent all other species to grow. A dense layer of different plant species quickly covers lakeshores, rivers and other embankment in summer, but in winter those places are empty and covered by dry stems.

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