Iowa has the largest network of water-quality sensors in the U.S.
Nitrate sensors deployed in the network, with results displayed on IWQIS
Sensors measuring temperature, pH, SC, DO, and turbidity
Iowa Water-Quality Information System (IWQIS)
IWQIS allows users to access real-time water-quality data and information, such as nitrate, pH, and dissolved oxygen concentrations, discharge rates, and temperature.