Perchlorate measurement context
An oxidizer found in some fertilizers, fireworks and rocket fuel that can reach groundwater.
Keep species and units explicit
Identify the individual ions and the requested reporting basis. Nitrate, nitrite and combined measurements should not be treated as interchangeable, and nitrogen-basis results differ from compound-basis results.
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.