<p>According to the Oregon Department of Environmental Quality (<a title="link to Oregon DEQ site" href="http://www.deq.state.or.us/wq/SB737/ ">DEQ</a>), pesticides make up the largest category of persistent pollutants on a <a title="persistant pollutant list - DEQ" href="http://www.deq.state.or.us/wq/SB737/ ">list</a> (51 out of 140) that they released in June of this year.  </p>