s are a form of radiation frequently associated with nuclear testing and radioactive mineral deposits.1.5 pCi/L3.4 pCi/LNoNo15 pCi/LStrontium-90Strontium-90 is a radioactive pollutant from nuclear fallout and possibly weapons and power production.0.35 pCi/L0.77 pCi/LNoLegal at any levelThis is the Federal Limit.