I would like my water sampled for a chemical the SPHL does not test for. Now what? ← Private Drinking Water Certain circumstances sometimes require you to have your private well water tested for specific chemicals. For chemicals that the SPHL does not run tests for, the DNR has a list of private labs that may be able to assist you at: https://dnr.mo.gov/water/business-industry-other-entities/certified-laboratories/chemical.