IDPH ends longtime testing for certain pesticides Ryan Voyles 1 year ago After nearly half a century, the Department of Public Health will discontinue statewide testing for organochlorine pesticides, like DDT, in the state’s lakes and rivers.To access this content, you must purchase 1 Year Health News Illinois Subscription or 1 Year Group Subscription - Up to 5 Users, or log in if you are a member.