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Environmental organizations say the proposed rollback is dangerous and a huge step backwards. EPA says 1.1 million 'Mericans live within three miles of a coal plant. The 2015 rules set deadlines for plant owners to invest in modern waste treatment facilities to keep toxins out of local water sources, set minimum standards for storage structures, and monitor water quality. However, they did not designate coal ash as a "hazardous substance", which it clearly is. The old rules would have increased plant operating costs, but better protect public health from heavy metal exposure. Heavy metals like lead, arsenic, selenium and mercury are very toxic and carcinogenic. Around the nation there about 1,300 coal ash, the waste from burning coal, storage sites. About 130 tons are created each year. A study by environmental groups, found 90 percent of the 265 coal plants required to test their groundwater near coal ash dumps discovered unsafe levels of at least one contaminant. The old were rules were to go into effect in 2018, but were delayed until 2020 by industry hack, Scott Pruitt, who was forced to resign as EPA administrator for ethics violations.