![]() ![]() The Agency noted in March 2010 that it had initiated a reassessment of the health risks associated with chromium exposure and that the Agency did not believe it was appropriate to revise the national primary drinking water regulation while that effort was in process. EPA reviewed total chromium as part of the second six-year review that was announced in March 2010. The SDWA requires EPA to periodically review the national primary drinking water regulation for each contaminant and revise the regulation, if appropriate. The national primary drinking water regulation that established the MCL for total chromium of 0.1 mg/l mg/lMilligrams per liter Mg/LMilligrams per liter Mg/LMilligrams per literMilligrams per liter was promulgated in 1991. MCLs are set as close to the health goals as possible after considering costs, benefits, and the ability of public water systems to detect and remove contaminants using suitable treatment technologies. In most cases, the enforceable standard is known as a maximum contaminant level (MCL), the maximum permissible level of a contaminant in water which is delivered to any user of a public water system. These non-enforceable health goals, based on possible health risks from exposure over a lifetime, are called maximum contaminant level goals (MCLGs).ĮPA sets enforceable standards for drinking water contaminants based on the best available science to prevent potential health problems. The Safe Drinking Water Act (SDWA) requires EPA to determine the level of contaminants in drinking water at which no adverse health effects are likely to occur. There are demonstrated instances of chromium being released to the environment by leakage, poor storage, or inadequate industrial waste disposal practices. It can also be produced by industrial processes. ![]() Chromium-6 occurs naturally in the environment from the erosion of natural chromium deposits. It is found in many vegetables, fruits, meats, grains, and yeast. ![]() The most common forms of chromium that occur in natural waters in the environment are:Ĭhromium-3 is an essential human dietary element. Chromium is found naturally in rocks, plants, soil and volcanic dust, and animals. Chromium is an odorless and tasteless metallic element. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |