The levels of sixteen polycyclic aromatic hydrocarbons (PAH) were determined in samples of underground waters from piezometers located around the municipal waste dump “Swojczyce” in Wrocław. Water for analyses was sampled in June, September and December 2001. It was found that the levels of PAH in waters flowing out of the dump were even several times higher than in waters flowing into the dump. The most abundant PAH were tricyclic hydrocarbons which have no immediate carcinogenic effect. According to Bąbelek’s classification the underground waters leaving the dump can be considered as waters not polluted with polycyclic aromatic hydrocarbons.

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