What Is Coal Ash?

Coal ash is the toxic-laden waste left behind after coal is burned for energy. Coal-fired power plants in the US produce 140 million tons of coal ash waste every year. Coal ash waste contains many heavy metals and other toxic elements, which are concentrated in the ash when they are prevented from escaping through the plants’ smokestacks.

Musselburgh Fly Ash Lagoon, from James TM Towill via Wikimedia Commons

Image Credit: James TM Towill, via Wikimedia Commons

Generally, the ash is collected and then transported to large coal sludge “ponds,” i.e. lagoons, or to dry landfills, where it is stored indefinitely. The riskiest of the coal ash storage facilities are lagoons, where the toxins in coal ash essentially dissolve into the water they are mixed with. This toxin-filled water sits behind earthen dams where it can leak into groundwater, and is also frequently sent, still laden with contaminants, back into rivers and lakes - both recreational waters and drinking-water sources.

What's in Your Water?

Image Credit: Manojkiyan via Wikimedia Commons

What’s In Coal Ash?

The toxic contaminants in coal ash severely damage human health and the environment. These contaminants include arsenic, lead, mercury, selenium, cadmium, and chromium, to name a few. Alarmingly, most of the storage facilities for coal ash don’t have any waterproof liners to prevent these toxins from leaking into groundwater and contaminating aquifers and public waterways.

EPA’s draft risk assessment on coal ash found that the cancer risk from drinking water contaminated with arsenic from coal ash disposed of in unlined lagoons is as high as 1 in 50, and is especially high for children. This is 2,000 times EPA’s regulatory goal for acceptable cancer risk.

Who’s At Risk?

Anyone near a coal ash impoundment, especially a wet impoundment or “lagoon”, is in danger, and there are a lot of these lagoons in the Southeast. Lagoons rely on earthen dams to hold back ash and wastewater; these dams can leak, or even collapse altogether, as happened at the Tennessee Valley Authority’s Kingston coal plant in 2008. The Kingston disaster contaminated over 300 acres of surrounding property, poisoned two nearby recreational waterways, and tore full-grown trees out of the ground as it destroyed homes and other property in its path.

Even absent a catastrophe like Kingston, coal ash waste dumps – both wet and dry – pose a threat to everyone in the surrounding area. Water contaminated with coal ash pollutants has been known to move more than a mile from coal ash dumpsites. Dry landfills also pose dangers to drinking water and aquatic life, and damage air quality when the fine dust from these containment facilities is blown into surrounding neighborhoods.

What’s Being Done to Protect Us From These Toxins?

There are no federal safeguards for coal ash storage and disposal, and state standards are both inconsistent and insufficient. In 2010, the US EPA issued some proposals on how to regulate and manage coal ash, but it’s been over two years since then, and there are no signs right now of EPA making a decision or finalizing its proposal. In the meantime, there have been continuing efforts by industry lobbyists and certain congressional representatives to strip EPA of its authority to provide science-based protections to the American people.