Your browser does not support JavaScript! NAWQA Box Charts




Features:

Concentrations and detection frequencies of pesticides, nutrients, VOC's and trace elements in NAWQA study units begun in 1997 can be selected and plotted above.

Summaries of chemical concentrations and detection frequencies from individual study units are compared to findings from 1991 to 2001 and to water-quality benchmarks for human health, aquatic life, fish-eating wildlife, or prevention of nuisance plant growth. These graphical summaries provide a comparison of chemical concentrations and detection frequencies between (1) surface- and ground-water resources, (2) agricultural, urban, and mixed land uses, and (3) shallow ground water and aquifers commonly used as a source of drinking water.

Note to users:

The analytical detection limit varies among the monitored chemicals, thus frequencies of detections are not comparable among chemicals.

When comparing data, the detection frequency should be considered along with the concentration.

Quality control data for the analytes listed above had relatively frequent low-level contamination of samples during sample processing. Results for these analytes cannot, therefore, be presented using the generalized methods that were applied to other analytes. Analysis of results for analytes potentially affected by contamination requires special statistical treatment beyond the scope to this web page. For more information about these analytes and how to interpret data on their occurrence and concentration, please contact the appropriate NAWQA Study Unit.

Trace elments in ground water: aluminum, barium, boron, cadmium, chromium, cobalt, copper, lithium, nickel, strontium, zinc

SVOC's in bed sediment: phenol, bis(2-ethylhexyl)phthalate, butylbenzylphthalate, di-n-butylphthalate, idethylphthlate

Insecticides in water: p,p'-DDE