However, no individual firm dominates any sector of the market. Their market share is small - individual companies may have, at most, between 2 and 5 percent of the market. Some large foreign companies have established Czech subsidiaries, and are very active in waste salvage and disposal practices. Some foreign firms have also established joint-stock companies with municipalities. The Danish firm Marius Pedersen, Austrian A.S.A., or many German firms may serve as good examples.
British firms are active in water supply and wastewater treatment services in North Bohemia.
Increased activity of French firms in the water supply and wastewater treatment sector has been observed recently, with companies setting up joint-ventures with municipalities. In many environmental sectors, foreign companies do not have an established presence in the Czech Republic. The system of licensed technology sales is satisfactory and effective. Other notable cases include sales of environmentally-friendly fertilizers for agriculture, chemicals for wastewater treatment systems, tap water treatment systems, air filters, lab equipment etc. Interestingly, in several cases, formerly foreign co-owned firms have been bought out by the local partner after two or three years of collaboration.