Indian River Power Plant

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Indian River Power Plant has 28 groundwater monitoring wells, 16 of which have been polluted above federal advisory levels based on samples collected between April 19, 2010 and October 23, 2019. Groundwater at this site contains unsafe levels of manganese, sulfate, boron, cobalt, arsenic, lithium, molybdenum, beryllium, selenium and mercury.

Site description

The Indian River Power Plant is a 410-MW coal-fired plant located near Millsboro, Delaware in Sussex County along the Indian River. The facility was first built in 1957 and had four coal-fired units at its peak, with two units retired in 2013 and a third retired in 2014. NRG had scheduled the fourth unit to be retired by June 2022, but regional grid manager PJM has recommended that the last unit remain operational until 2026. Upon commissioning, the plant disposed of its coal ash waste on Burton Island, east of the power plant. Berms were built using ash and dredge spoils on Burton Island, resulting in an elevation of the ground surface by about 15 feet, and the conversion of tidal marshes and flats to land made of coal ash contaminated with heavy metals. In 1980, Indian River Power Plant built a landfill on the mainland to dispose of waste and ceased disposal on Burton Island.

You can find the industry-reported data here. For more information on the Indian River Power Plant, see EIP’s 2019 National Coal Ash Report.

Monitoring Wells Wells reporting one or more exceedances for at least one pollutant.
16 / 28
Wells not shown Locations for the following wells are unavailable:

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No exceedances
One or more exeedances
No data available
Other designation
Well "halo" size corresponds to mean concentration. Please note that some wells may not be visible on the map due to overlapping locations.
Pollutants monitored and above guidelines
Tip: Click on a contaminant to view wells that have recorded exceedances. Click again to remove the filter. arsenic beryllium boron cobalt lithium manganese mercury molybdenum selenium sulfate
Pollutants monitored and below guidelines
antimony barium cadmium chromium copper fluoride lead radium thallium
Pollutants not monitored
ammonia, cyanide, gross alpha particle, gross beta particle, hexavalent chromium, nickel, nitrate, nitrite, silver, strontium, tritium, uranium

Facility last updated on Wednesday, October 19, 2022 02:57:44 PM EDT