One common disadvantage of springs and wells is the occasional high concentrations of carbon dioxide and nitrogen gas. Both gases are easily removed through intense agitation. Under some circumstances the five other sources listed are acceptable. Selecting any source without first determining its quality is very risky. Most water quality tests are very simple and inexpensive.
Many laboratories can conduct analyses for most routine water quality parameters.
Inexpensive tests kits may also be purchased which will determine the concentrations of dissolved oxygen, carbon dioxide, nitrite, nitrate ammonia, hardness and alkalinity. Prices of tests kits may range from inexpensive aquaria kits to more expensive battery operated meters. Determining if pesticides and heavy metals are present can be very expensive if a comprehensive analysis is requested. Instead, laboratory analyses for three commonly found chemicals contaminates, DDT, lead and mercury, are usually sufficient. More specific analysis should be done if there is an indication that other contaminates are present.