Water Conservation in Labs: Protecting Chesapeake Bay Tributaries Start at the Sink

From glassware rinsing to buffer prep, labs use a lot of water—and can unintentionally dispose of pollutants into the same waterways they are trying to protect. In Maryland, that connection is especially direct: much of the state drains to the Chesapeake Bay, where excess nutrients and sediments remain a long-standing water-quality challenge.¹

EPA established a Bay-wide Total Maximum Daily Load (TMDL) in 2010, aiming for major reductions in nitrogen, phosphorus and sediment, with a target timeline extending to 2025.¹ NIH complies with the National Pollutant Discharge Elimination System (NPDES) permit guidelines under the Clean Water Act (CWA), Section 402, prohibiting discharge of “pollutants" from a “point source" into the waters of the United States.

Although the water from the labs is not discharged into rivers or the Bay, they discharge indirectly into a publicly owned treatment works (Publicly owned treatment work (POTW )municipal sewer) regulated by Washington Suburban Sanitary Sewer​ (WSSC). Even “small" discharges add up when multiplied across hundreds of labs, hospitals and research facilities — especially when pollutants interfere with wastewater treatment or contribute to nutrient and toxic loads.¹

NIH has a drain discharge policy providing guidance for safely disposing of ​materials to prevent any inadvertent release into the wastewaters regulated by WSSC. Learn more about the water conservation efforts for drain disposal in labs in the Take Action article.

Water conservation in labs isn't just about lowering utility bills — it's about preventing small daily practices from having cumulative impacts on Maryland's rivers and the Chesapeake Bay. ​