Analysis of monitoring programs of pesticides at water utilities using statistics on water supply

Abstract

 Monitoring programs of pesticides at 1554 water utilities throughtout Japan were investigated using statistics on water supply. As the trends of the monitoring of the pesticides at the water utilities, the number of pesticides monitored became lagerer, as the annual frequency of monitoring became lower. Also, at the most water utilities monitoring pesticides, the pesticides were monitored at least once in spring to summer, the seasons that the tendencies of the detection of the pesticides were higher. On the other hand, the pesticiedes were not monitoterd at about 50% of water utilities. The percentages of the water utilities monitoring pesticides were higher, as the scales of the water utilities were lager. In most cases, the frequency of the monitoring of pesticides were less than four. There were a number of the water utilities that the frequency of pesticide monitoring was once. The percentages of the water utilities measured 102 pesticides, the all pesticides selected as management items, to total water utilities monitered pesticides were 34% for raw water and 38% for finished water.