Table
The Assessment of the Cleanliness of Lakes Tested in the Years 1974–1994
(According to: Environmental Protection 1996, CSO Warsaw 1996)

Class of Cleanliness	Number of Lakes	Volume (million m3)
I	36	2,774.0
I/II*	3	248.7
II	338	10,942.5
II/III*	11	377.7
III	345	7,338.4
III/not classified*	2	31.3
not classified	225	3,160.1
total	960	25,122.7

^* relates to lakes of different cleanliness classes in different parts of the lake

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