Radon in water measurement context
Radon-222 is a radioactive gas that forms as uranium in rock and soil decays and dissolves into ground water, so it matters mainly for wells and other ground-water supplies. Most of the risk comes from breathing radon released into indoor air when the water is used, with a smaller risk from drinking it. EPA proposed a drinking-water regulation for radon in 1999, for systems that use ground water, and has not published a final rule, so radon is not among the contaminants in the current national primary drinking water regulations. Radon in water is expressed in picocuries per liter (pCi/L). Radon escapes from water quickly, so contact us before sampling. Asbestos and arsenic forms
Define the specialty measurement
State the isotope, fiber or chemical-form question as applicable. A total, gross or combined measurement does not automatically answer a species-specific question.
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.