August 26, 2008 
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Self-testing kits are available at a relatively low cost. Though they are more limited than laboratory tests, they can be useful in certain situations. If you have evidence that a
particular pollutant is or has been in your tap water, self-tests may allow you to determine if it continues to be there. You may want to test for that pollutant several times over the course of a year to allow for seasonal fluctuations. If the pollutant in question is bacteria or a common toxic metal, you can buy inexpensive and easy-to-use test kits. However, be aware you cannot self-test for viruses or parasites, organic chemicals, rare metals or radioactive substances. Once you have determined what substance or substances are present in your water, it is advisable that you use a water filtration system designed specifically for your situation to purify and keep your water purified, especially if your water supply is from a well, spring or other private source.
Excerpted from “The Drinking Water Book” by Colin Ingram.