Democrats on the House Energy and Commerce Committee are asking the Environmental Protection Agency (EPA) to explain a drop in the number of hazardous waste sites that the agency cleaned up last year.

The figures show that the agency had the highest number of unfunded construction projects at major hazardous waste sites of the last 15 years.

In 2019, the EPA did not have funding to begin work on 34 so-called Superfund sites, a number more than 50 percent above the highest figures from the Obama administration.

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“Unfortunately the increase in the number of unfunded cleanup of Superfund sites follows repeated proposed budget cuts to the superfund program and raises concerns the EPA is failing to effectively implement this program,” Reps. Frank Pallone (D-N.J.), Paul Tonko Paul David TonkoClark rolls out endorsements in assistant Speaker race OVERNIGHT ENERGY: Supreme Court upholds permit for B pipeline under Appalachian Trail | Report finds NOAA 'Sharpiegate' statement 'not based on science' but political influence | EPA faces suit over plan to release genetically engineered mosquito Report finds NOAA 'sharpiegate' statement 'not based on science' but political influence MORE (D-N.Y.) and Diana DeGette Diana Louise DeGette87 lawmakers ask EPA to reverse course after rescinding methane regulations Overnight Health Care: Supreme Court to hear ObamaCare arguments 1 week after election | NYC positive COVID-19 tests hit record low With Biden, advocates sense momentum for lifting abortion funding ban MORE (D-Colo.) wrote in a late Thursday letter to the EPA, asking for a briefing from the agency as well as any plans to address the issue.

The EPA said it is in the process of teeing up a number of projects at Superfund sites.

"This translates to 40+ more communities being closer to having their sites cleaned up and deleted off the National Priorities List," the agency said in an email to The Hill.

"While Congressional funding for Superfund has remained essentially flat over the last 15 years, the number of newly funded projects at sites can be smaller or larger in a particular year due to the actual cost of the active projects."

But critics previously said the data highlights the dangers of the agency’s continued push to reduce its own budget.

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“Every year the president's budget says they want to cut the Superfund budget by hundreds of millions of dollars and every year Congress says no,” Betsy Southerland, director of the Office of Science and Technology at the EPA’s Office of Water under the Obama administration, told The Hill previously.

But as lawmakers instead give the EPA the same funding as the year before, that flatlining has real consequences, she said.

“The Trump administration is not telling Congress the honest number of dollars they need to fund all the projects that are ready to go,” Southerland said. “Congress thinks it’s doing the best possible thing by rejecting the cuts, but they’re not increasing the budget, so projects that are sitting in 2017, are sitting in 2018, and then sitting in 2019.”

Updated at 6:18 p.m.