ICETT Let's learn about Yokkaichi Pollution Outline of Japan's Industrial Pollution Abatement Preventative Measures Against Water Pollution Jinzu River, Toyama Prefecture 5) Water purification in the Jinzu River water system Figure 4 - 4 Figure 4 - 4 Figure 4-4 Year-on year change in cadmium concentration in the river bed at dams along the Jinzu River