Dioxin (2,3,7,8-TCDD) measurement context
2,3,7,8-Tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD) is the dioxin regulated in drinking water. EPA lists emissions from waste incineration and other combustion and discharge from chemical factories as its sources, and sets a maximum contaminant level of 0.00000003 mg/L (30 picograms per liter), one of the lowest for any regulated contaminant, so concentrations are usually expressed in pg/L.
Provide the compound list
A class name does not establish every target included. Specify the compounds, applicable drinking-water program and reporting limits; use the prescribed bottle and handling plan for the scope.
Include the complete project requirement
Provide the matrix, target analytes, required method, fraction, units and reporting limits. Include the permit or monitoring instructions where results will support a regulatory submission. Naming this method does not establish blanket compliance eligibility.
Resolve collection before sampling
Use the bottle, preservation and delivery instructions assigned to the agreed scope. Identify each location and collection time, and document any deviation. The final analytical plan must fit the submitted material and its intended use.
Related testing & guidance
Technical & service references
Vanguard service detailsSource review: November 8, 2026. The agreed method and project scope govern the testing.