Dave Johnston Power Plant

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Dave Johnston Power Plant has 32 groundwater monitoring wells, 29 of which have been polluted above federal advisory levels based on samples collected between September 25, 2015 and October 19, 2019. Groundwater at this site contains unsafe levels of sulfate, molybdenum, cobalt, boron, arsenic, lead, radium, fluoride, selenium, cadmium, lithium and thallium.

Site description

PacifiCorp's Dave Johnston Power Plant opened in 1959 and is located on the banks of the North Platte River in Glenrock, Wyoming in Converse County. It has three coal-fired generating units that can produce producing 922-MW of electricity. PacifiCorp has set the facility for retirement in 2027. The plant has two CCR units: Expansion Landfill and Ash Pond. The Expansion Landfill consists of three stages, each with a planned design life of 5 years. The total area of the landfill is approximately 122.6 acres. There is one retention basin that collects runoff from all three phases. The Ash Pond is divided to two individual ponds, 4A Pond and 4B Pond. Each pond has an approximate surface area of 19.5 acres and an approximate storage capacity of 144.6 acre-feet. Dave Johnston Power Plant is among the U.S. Environmental Protection Agency's list of potential damage cases, indicating that coal ash disposal at the site has potentially polluted groundwater or surface water at levels which threaten human health and the environment.

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

Monitoring Wells Wells reporting one or more exceedances for at least one pollutant.
29 / 32
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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 boron cadmium cobalt fluoride lead lithium molybdenum radium selenium sulfate thallium
Pollutants monitored and below guidelines
antimony barium beryllium chromium mercury
Pollutants not monitored
ammonia, copper, cyanide, gross alpha particle, gross beta particle, hexavalent chromium, manganese, nickel, nitrate, nitrite, silver, strontium, tritium, uranium

Facility last updated on Monday, October 24, 2022 10:48:58 AM EDT