Of the 255,000 wells, most of which are privately owned, the state has detected contaminants in 1,155, Mr. Moore said.

In addition to detecting contaminants, ATP systems also provide "proof of service" that an area has been effectively and thoroughly cleaned.

New technology has improved the ability to detect contaminants such as dioxin from parts per billion to parts per trillion.

Monitoring : Testing that water systems must perform to detect and measure contaminants.

This test does not detect hydrophilic contaminants, but the electroplating process can displace these easily since the solutions are water-based.

It is also used to detect and measure contaminants from spoilage or adulteration which may be harmful.

A sample of your car's engine oil is scientifically analyzed to detect contaminants like dirt, coolant, and wear metals.

- Analyzing the oil to detect contaminants and wear metals.

Federal studies at the Dixie site had detected heavy-metal contaminants like lead and copper.

The agency is detecting contaminants at a level of one part in one trillion.