“Fracking” wastewater — a byproduct of natural gas extraction found elsewhere to contain elevated levels of radioactivity – was dumped into the Patapsco River last year, The Bay Daily reports, which said about 50,000 gallons-per -day was dumped over several months.

“Fracking” has made headlines recently, due to some instances elsewhere in which the wastewater was found to be radioactive, but a spokesperson for Clean Harbors, the company given permission by the state to discharge the wastewater in this Cheaspeake Bay tributary, told the Bay Daily the water they dumped had no radioactive contamination.

Jay Apperson, of the Maryland Departmentof the Environment, told the publication that Clean Harbors tested the wastewater for radioactive materials, and found “no detectable levels.”

Meanwhile, “some communities near the new wells argue that their groundwater has been contaminated to the point where you can light tap water on fire,” according to guests on WEAA’s Marc Steiner Show, which aired a discussion of fracking on Wednesday. Here’s the podcast.