Long-term trends of PBDEs, triclosan, and triclocarban in biosolids from a wastewater treatment plant in the Mid-Atlantic region of the US.

•From 2005 to 2011, BDE-47+BDE-99 concentrations in biosolids decreased by 42%.•BDE-209 concentrations remained constant.•TCC decreased by 47% while TCS showed no temporal trend.•Contaminant concentrations did not correlate with seasons or with WWTP inflow.•Decreasing concentrations could be due to phase-out or usage/production reduction.