This is a targeted panel, not a broad screen. It uses EPA Method 525.2 to detect nine specific high-priority compounds at parts-per-billion sensitivity: the legacy chlorinated pesticides and herbicides that persist in the environment for decades, plus two plasticizers and one combustion byproduct that commonly travel with them. Atrazine and simazine — the two most frequently detected herbicides in U.S. surface water — are the headline analytes. These compounds are not covered by the Current-Use Pesticide & Fungicide Panel, which runs a different method for chemistry in present-day application.