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A report released by EarthJustice and the Sierra Club in early February 2011 stated that there are many health threats associated with a toxic cancer-causing chemical found in coal ash waste called [[hexavalent chromium]]. The report specifically cited 29 sites in 17 states where the contamination was found. The information was gathered from existing EPA data on coal ash and included locations in Alabama, Arkansas, Delaware, Florida, Illinois, Indiana, Minnesota, Massachusetts, North Carolina, North Dakota, Nevada, Ohio, Oklahoma, Pennsylvania, Tennessee, Virgina and Wisconsin. In Alabama, the TVA [[Colbert Fossil Plant]] in Tuscambia and the TVA [[Widows Creek Fossil Plant]] in Stevenson were both reported as having high levels of chromium seeping from unlined retention ponds.<ref>[http://earthjustice.org/sites/default/files/CoalAshChromeReport.pdf "EPA’s Blind Spot: Hexavalent Chromium in Coal Ash"] Earthjustice & Sierra Club, February 1, 2011.</ref>  According to EPA data, the Widows Creek coal ash site is an unlined pond. Hexavalent chromium (Cr(VI)) was reported at the site above 100 ppb (parts per billion) - 5,000 times the proposed California drinking water goals and above the federal drinking water standard.<ref name="blind spot"/>