3 percent of its lines annually, compared to 7 percent under the prior regulation. EPA's Consumer Confidence Rule of 1998 requires most public water suppliers to provide consumer confidence reports, also known as annual water quality reports, to their customers. Each year by July 1 anyone connected to a public water system should receive in the mail an annual water quality report that tells where water in a specific locality comes from and what's in it. Consumers can find out about these local reports on a map provided by EPA. 29% of Americans are reading their water quality reports. A 2003 survey found that customers were generally satisfied with the information they are receiving from their water companies and their local or state environmental offices. EPA published a proposed rule for perchlorate on June 26, 2019, with a proposed MCL of 0.056 mg/L for public water systems. On June 18, 2020 EPA announced that it was withdrawing its 2019 proposal, stating that it had taken "proactive steps" with state and local governments to address perchlorate contamination. In September 2020 the Natural Resources Defense Council filed suit against EPA for its failure to regulate perchlorate, and stated that 26 million people may be affected by perchlorate in their drinking water. In March 2021 EPA announced that it will develop national drinking water standards for perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) in public water systems. Groundwater pollution In November 2006, EPA published its Ground Water Rule, due to concerns that public water systems supplied by ground water would be vulnerable to contamination from harmful microorganisms, including fecal matter. The objective of the regulation, promulgated under the authority of the Safe Drinking Water Act, is to keep microbial pathogens out of public water sources. Congress recognized that injection wells were a potential threat to groundwater quality when they passed the Safe Drinking Water Act (SDWA) of 1974. This instructed the U.S. Environmental Protection Agency (EPA) to create a national program that would prevent underground injection activities that would endanger underground drinking sources. The EPA must regulate underground injection of fluids and wastes through wells that discharge or may release such material into or above an underground reservoir of drinkable water. The EPA has promoted several Underground Injection Control (UCI) regulations in order to protect underground reservoirs of drinkable water from being contaminated. Investment gap In its Infrastructure Report Card the American Society