The aim of this thesis was to check any pollution by heavy metals such as (Cr, Ni, Cu, Zn, As, Cd, Hg, Pb), oil pollutants (BTEX, MTME, TAME) and nutrients such as nitrates, ammonium and phosphate ions in water samples taken from, sea, lake and city water networksA solid phase microextraction (SPME) method has been adapted for the measurement of oil pollutants. The method was developed for measurements of BTEX, TAME MTBE in petroleum samples and all results are compared with the European and the Greek Legislation.The results showed that there is no pollution problem for the tested samples, since all parameters examined were found to be below legislative limits