The USEPA set the MCL for dissolved arsenic at 10ppb (parts per billion) and all products in the Arsenic Quick™ line of arsenic test kits can detect that concentration and lower. Additionally, all Arsenic Quick™ water test kits require no special equipment, require less than 15 minutes to perform a test, and do not require the persons doing the testing to possess a degree in chemistry or advanced training.
Well water that contains arsenic typically will not have a discernible taste, smell or color... so only testing for arsenic in well or drinking water will let you know whether or not the water from your well contains dissolved arsenic, a semi-metal that if consumed can cause both immediate harm and long-term harm. For more information on arsenic in drinking water, please check out the Arsenic in Water section of the Water Testing Blog.