The presence of concentrations of organic substances in water is a matter of increasing concern to the water industry, environmentalists and the general public alike from the point of view of possible health hazards presented to both human and animal life, represented by domesticated and wild animals and bird and fish life. This awareness hinges on three facts: the increasing interest by the scientist and the public alike in matters environmental, an increased usage of organic materials in commerce coupled with the much wider variety of organic substances used nowadays, and finally, the availability of analytical methods sensitive enough to determine very low concentrations of these substances, the presence of which we formerly were unaware.