Toxicity Testing Unit
Aquatic Water Flea;
(Photo courtesy by USGS)
Contact Information: Nicole Wright, Chief Toxicity Testing Unit
As part of the RIBS program, the Toxicity Testing Unit (TTU) uses bioassays to look for toxicity in surface waters and sediments. Tests on ambient surface waters are conducted using the "water flea" (a crustacean), Ceriodaphnia dubia, to identify toxic effects on survival and reproduction. Collected sediments are also analyzed using the Microtex® toxicity testing system, which uses the bioluminescent bacterium Vibrio fischeri to look for the presence of toxicity in bottom sediments.
of ENFO Project)
The TTU also provides technical oversight of Whole Effluent Toxicity (WET) testing programs required at some industrial, municipal and remediation facilities as part of the State Pollutant Discharge Elimination Systems (SPDES) permit program.