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In late 2008 increasingly high concentrations of total dissolved solids (TDS) exceeding Federal Safe Drinking Water Act (SDWA/PL 93-523) standards of 500 milligrams per liter (mg/L) for public water supplies were found in the Monongahela River. The Pennsylvania Department of Environmental Protection (PA DEP) began investigating TDS levels at points along approximately 70 stream miles on the Monongahela River from the West Virginia border to the confluence with the Youghiogheny River. In response, the West Virginia Water Research Institute (WVWRI) spearheaded a long-term water quality monitoring program in the Monongahela River Basin to identify sources and potential remediation options. The team found that modulation of the discharge volume from acid mine drainage treatment plants along the river could control TDS and sulfate levels below SDWA limits. Operators of the AMD treatment plants implemented the newly developed discharge management plan. The monitoring program expanded in 2012 to include the Allegheny and Upper Ohio River basins, adopting the name Three Rivers Quest (3RQ).
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