The Environmental Protection Agency (EPA) in the United States is working to establish frequent testing standards to control the levels of pollutants in drinking water, groundwater, and waterways. The drinking water contained 141 unregulated chemicals along with 119 chemicals that the U.S. Environmental Protection Agency (EPA) had set health-based limits on. The most common chemicals they found were: Disinfection byproducts, Nitrates, Chloroform, Barium, Arsenic, and Copper.
The EPA is currently working with NanoLogix, involving rapid detection and identification of live-threat bacteria and protozoa. NanoLogix’ BioNanoFilter (BNF) technology is a quick on-site test to identify live-threat contamination in drinking and source water. FDA rules exempt waters that are packaged and sold within a single state, which describes between 60% and 70% of all U.S. bottled water. About one out of five states don't regulate these waters, either, and carbonated water and seltzer are also exempt.
Technology that can safeguard the water supply includes the following: reverse osmosis systems, distillation systems, ultraviolet treatment systems with pre-filtration, and water softeners. Take the environmentally friendly approach by cutting back on the overall water use such by washing only full loads of clothes and by taking faster showers.
Image source and credits: https://www.axeonwater.com/blog/lead-nitrate-bacteria-oh-whats-lurking-water/