Our unmanned surface vehicle USV drives on the water surface of inland water bodies. It is equipped with several sensors which continuously measure a range of water quality parameters. A water sampler unit on the USV can automatically collect up to 4 separated samples per mission. The extension of the USV is a gondola that can be lowered to any depth of the water body. The gondola is equipped with light, sensors and a camera. It forwards data via a tether to the USV. An unmanned aerial vehicle UAV that flies above the water surface is the third pillar of our integrated approach. It is equipped with a multispectral camera and captures images around the USV. With the help of machine learning the water quality data can be read from the images. All data is automatically saved in a cloud and can be downloaded for water quality analysis