As the deficit of clean water becomes more of a problem in Europe, there is a need to develop easily accessible, cheap and reliable microsystems, which could be used for water pollution monitoring and early warning of many water European resources. The equipment available so far is mostly of laboratory type and measures water samples inserted to the measuring device. The objective of this proposal is to create a system of continuous water pollution monitoring in real time. Small and relatively cheap smart sensors are developed, which, when inserted in many places of water resources, collect data about pollution. "Ion Selective Field Effect Transistors" (ISFET) are used as sensors. Covering them with ion-selective membranes creates sensors called CHEMFETs. Data processing, coding, storing and transmitting circuits are integrated in the smart probe. Software for visualiation of the results will also be developed.