Well Water Contamination and Testing

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A proper testing protocol for well water contamination will include a check for heavy metals.

Q: I’ve heard horror stories about well water contamination from chemicals that seeps in from area industrial sites, gas stations, and the like. To protect my family from this potential hazard, how often would you suggest that I test my water, and where can I obtain the materials necessary for doing so?

Unfortunately, it is all too possible for residential water from private or community wells to be contaminated with toxic organic chemicals, or heavy metals, at concentrations that represent long-term health risks. For example, many toxic organic chemicals can cause significant health problems above a concentration of 10 parts per billion (PPB), but until such a contaminant reaches, say, 100 PPB, it may remain completely tasteless and odorless. Therefore, detecting organic and heavy-metal contaminants in the appropriate concentration ranges can generally be done only by using sophisticated instruments in a chemical laboratory. Worse yet, a complete battery of tests by a commercial lab may be expensive. Before you give up in despair or spend your hard-earned greenbacks, follow these suggestions:

First, find the source of your drinking water. If you have a private well, mark its exact location on a map of the surrounding area. Likewise, if you drink water supplied by a public utility, find the location of that well or reservoir and designate it on a map. Then walk or drive around all the land within a five-mile radius of the well, checking for any abandoned or operating industrial sites, hazardous waste dumps, or municipal garbage pits. If your search turns up nothing, you can breathe a partial sigh of relief, because it’s likely — though not guaranteed — that your well will not be contaminated by any sources of pollution beyond that radius.

If, however, you still want to have your water analyzed, call your state capital’s Environmental Protection Agency office or talk with a chemist at a local university. Tell these professionals the nature of your concerns and the results of your walking survey, and state precisely that you want your water analyzed for trace organic chemicals and heavy metals but not for bacteria, viruses, pH, or hardness. If these folks can’t do the job, ask them for the names of at least three commercial laboratories that could possibly provide such a service.

 David Burmaster, Ph.D., is a consultant on surface- and ground-water quality and hazardous waste management. He is the author of numerous articles and reports on these topics.

  • Published on Jan 26, 2011
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