**Inorganic Chemicals:** Analysis for Lead (Pb), Copper (Cu), Arsenic (As), and Nitrates from agricultural runoff. * **VOCs (Volatile Organic Compounds):** Testing for solvents, fuels, and industrial chemicals. * **PFAS/PFOS:** Analysis for "forever chemicals" now strictly regulated under newer CA SWRCB standards. * **Hexavalent Chromium:** Specific California-mandated testing for industrial byproduct contamination.