This talk will review new concepts for in-situ environmental analysis based on novel electrochemical sensing strategies. Several new strategies are covered, including the use of remotely deployed sensors and submersible analyzers. These devices offer a fast return of the chemical information in a safe and timely manner. The new concepts will be discussed in connection to the in-situ monitoring of priority inorganic and organic contaminants. The challenges facing the development of such reliable in-situ electrochemical sensors and potential solutions will be discussed.