This book is on Freshwater samples from oil producing communities of Egi, Omoku and Egbema in Ogba/Egbema/Ndoni Local Government Area in Rivers State, Nigeria which were examined for physico-chemical parameters and polycyclic aromatic hydrocarbons (PAHs) loads. The human carcinogenic risk of seven priority PAH suites were also determined. Physico-chemical parameters was determined using standard methods. Determination of PAHs was done using gas chromatography/flame ionization detector (GC/FID), the risk assessment of probable human carcinogens in the Group B2 PAHs via ingestion determined in accordance with the standards of the United States Environmental Protection Agency (USEPA) for individuals of selected ages.