Tap water remains susceptible to biological or chemical contamination.

While most of the water was fine, in many bottles the tests detected traces of microbial or chemical contamination.

Food safety if defined by the absence of a health risk due to physical, chemical and microbiological contamination.

Second, it can have chemical contamination from human activity or natural sources.

The upward trends, the ocean agency report said, "should be interpreted as indicating that ongoing human activity is increasing chemical contamination."

I'm dead worried about biological or chemical contamination from that side.

A. Water quality, measured from the standpoint of bacterial or chemical contamination, was excellent.

But management problems and failures to clean up radioactive and chemical contamination at the 5,300-acre site could doom the lab.

These are programs for fires, earthquakes, radioactive and chemical contamination, military conflict, etc.

As the process continues, reports about radioactive and chemical contamination at the site continue to emerge, adding to public concerns.