{"data":{"id":"us/40-cfr-table-1-to-subpart-a-of-part-192","jurisdiction":"us","citation":"40 CFR Table 1 to Subpart A of Part 192","heading":"Table 1 to Subpart A of Part 192—Maximum Concentration of Constituents for Groundwater Protection","body":"Constituent concentration 1 Maximum\nArsenic 0.05\nBarium 1.0\nCadmium 0.01\nChromium 0.05\nLead 0.05\nMercury 0.002\nSelenium 0.01\nSilver 0.05\nNitrate (as N) 10.\nMolybdenum 0.1\nCombined radium-226 and radium-228 5 pCi/liter\nCombined uranium-234 and uranium-238 2 30 pCi/liter\nGross alpha-particle activity (excluding radon and uranium) 15 pCi/liter\nEndrin (1,2,3,4,10,10-hexachloro-6,7-exposy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo,endo-5,8-dimethanonaphthalene) 0.0002\nLindane (1,2,3,4,5,6-hexachlorocyclohexane, gamma insomer) 0.004\nMethoxychlor (1,1,1-trichloro-2,2′-bis(p-methoxyphenylethane)) 0.1\nToxaphene (C10 H10 Cl6, technical chlorinated camphene, 67-69 percent chlorine) 0.005\n2,4-D (2,4-dichlorophenoxyacetic acid) 0.1\n2,4,5-TP Silvex (2,4,5-trichlorophenoxypropionic acid) 0.01\n1 Milligrams per liter, unless stated otherwise.\n2 Where secular equilibrium obtains, this criterion will be satisfied by a concentration of 0.044 milligrams per liter (0.044 mg/l). For conditions of other than secular equilibrium, a corresponding value may be derived and applied, based on the measured site-specific ratio of the two isotopes of uranium.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER F—RADIATION PROTECTION PROGRAMS","PART 192—HEALTH AND ENVIRONMENTAL PROTECTION STANDARDS FOR URANIUM AND THORIUM MILL TAILINGS","Subpart A—Standards for the Control of Residual Radioactive Materials from Inactive Uranium Processing Sites"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"868028f3d44ac5d53bd6deb13dac7369884af0d28e4937112c11de6fefb9bf51","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-192.04","next":"us/40-cfr-192.10"},"notice":"GroundRules: Original legal text. Not legal advice."}