In 1991, the MCL for chromium exposure was set based on potential of “adverse dermatological effects” related to long-term chromium exposure.[1] Chromium's MCL of 100 ppb has not changed since its 1991 recommendation. In 1998, the EPA released a toxicological review of hexavalent chromium.[41] This report examined current literature, at the time, and came to the conclusion that chromium was associated with various health issues.[43] As of 2012, “no federal or state laws restrict the carcinogen's presence in drinking water,” according to the Natural Resources Defense Council (NRDC).[44]