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Drinking Water In Connecticut
Publication No. 24: Residential Drinking Water Well Testing

Testing your well water can provide you with information on the quality of your drinking water. Testing is one way to ensure that your private drinking water supply is safe from harmful impurities. In addition, testing can determine what other nuisance impurities – like iron and manganese – may exist.
Private Water Supplies
The U.S. Environmental Protection Agency (EPA) does not regulate Private wells. Private well owners are responsible for the quality of their own drinking water. Homeowners with private wells are generally not required to test their drinking water. However, they can use the public drinking water standards as guidelines to ensure drinking water quality. We suggest you test your water semi-annually (spring/fall) for a few of the more common contaminants. Even if your current water supply proves to be clean and . safe to drink, regular testing is important because it establishes a record of water quality that may help solve future problems.
Additionally, if there are known contamination problems in your area and if neighbors have experienced well water contamination, you should consider testing your drinking water for those contaminants. Know the history of your neighborhood and whether or not there are any water quality problems from either natural or manmade contaminants. If you have questions, you should call your local health department first. The Connecticut Department of Public Health (DPH) Private Well Program @ 860-509-7296 can also be utilized as a resource for questions.
Public Water Systems
If you receive your drinking water from a public water system, the source of drinking water is either a surface water reservoir, a public well that pumps groundwater, or both. A system of pipes distributes the water to you and your neighbors.
Federal and State laws require the public water systems regularly test for over 80 contaminants in the water. Public water systems test water from the raw supply – the rivers and ponds in their watershed, the reservoir(s), or the well(s) – the water treatment plant, and public and private buildings throughout their distribution system. The water quality must meet standards set by the EPA as well as additional standards set by the DPH. These standards are limits on the amount of contaminants allowed in the treated drinking water. These limits are known as the maximum contaminant level or MCL. The water is safe to drink if the amount of the contaminant is below the MCL. If the amount is above the MCL, the water is not safe to drink.
Public water systems are required by the law to develop and distribute an annual water quality report (known as the Consumer Confidence Report) to their customers. This report contains information about the previous year’s water quality and whether or not there were any violations of the federal and state water quality standards. You can also call your water utility for information about drinking water quality.
For more information on Uranium in Private Well Water click here.
For more information on MTBE In Drinking Water
click here.


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