Water Well Testing in Connecticut

According to the Connecticut Department of Energy and Environmental Protection, 23% of residents in Connecticut use private wells as their primary source of drinking water. Many of which do not know when it’s appropriate to test their water well, what they should be testing for, or how to administer testing.

Our Connecticut Water Well Testing Services

If you have a property or are purchasing a property that has a private well supplying water to the house, we suggest that you have Connecticut water testing services completed to determine the quality of the water. SIS has conducted well water testing in Connecticut for years. Our inspectors will come to your property, draw water samples, deliver them to a qualified, approved laboratory for testing, and share the results with you in a handy report.

potable water testing

How to Test Water Quality

The most common test we perform is a simple potability scan which will test for coliform bacteria, minerals, and other physical parameters to determine if the water is considered safe and acceptable to drink. It’s important to test well water in CT to detect if any harmful substances are in the water. We assess several factors when we complete our extensive Connecticut well water testing.

Water Quality Parameters

  • Odor: well water should be free of odor.
    • Maximum Contaminant Level (MCL) = None
    • Scale: 0 (none) – 5 (strong)
    • Recommended Level < 2

  • Turbidity: measure of particles in the water, usually indicates iron.
    • Maximum Contaminant Level (MCL) = None
    • Recommended <5

  • pH Level
    • Maximum Contaminant Level (MCL) = None
    • A level of 7 is neutral, <7 is acidic, >7 is basic. A pH less than 6.4 is considered acidic and may be corrosive to piping.
    • Scale: 0 – 14 pH
    • Recommended 6.4 – 10 pH

  • Color
    • Maximum Contaminant Level (MCL) = None
    • High color usually indicates the presence of iron.
    • Recommended <15

  • Nitrite Nitrogen
    • Maximum Contaminant Level (MCL) = 1.0 mg/L
    • An intermediate breakdown product of organic matter.

  • Nitrate Nitrogen
    • Maximum Contaminant Level (MCL) = 10.0 mg/L
    • The final completely oxidized stage of nitrogen. Levels above 10 are known to be harmful to infants. Pregnant/nursing mothers and parents of infants should consult with a physician.

  • Chloride
    • Maximum Contaminant Level (MCL) = 250 mg/L
    • The non-metallic portion of common salt. Levels above 50mg/L may indicate undesirably high sodium levels and it also may appreciably increase corrosion rates. Levels above 250 mg/L impart a salty taste noticeable to most people.

  • Hardness
    • Maximum Contaminant Level (MCL) = none
    • A measure of the total calcium and magnesium in water. Water over 100mg/L is described as hard and levels over 250 mg/L are considered very hard. The effect of hardness is to increase the amount of soap necessary to form suds with water. High levels may also increase scaling on the inside of water pipes.

  • Iron
    • Maximum Contaminant Level (MCL) = none
    • Above 0.3 mg/L iron may cause staining to laundry and fixtures. Iron is naturally occurring water mineral due to the geology of the area.

  • Manganese
    • Maximum Contaminant Level (MCL) = none
    • Above 0.05 mg/L manganese may cause staining to laundry and fixtures.

  • Sulfate
    • Maximum Contaminant Level (MCL) = none
    • A naturally occurring substance in water. Levels above 250 mg/L may impart a bitter taste and render a laxative effect.

  • Sodium
    • Maximum Contaminant Level (MCL) = none
    • A notification level of 28 mg/L has been established for people on low salt diets. High levels may increase the corrosive effect.

  • Uranium
    • Maximum Contaminant Level (MCL) = 30.0 mg/L
    • Toxic, naturally-occurring metal that can have negative health effects if people are exposed to it at high levels. The toxicity of uranium metal has been linked to kidney issues.

  • Arsenic
    • Maximum Contaminant Level (MCL) = 10.0 mg/L
    • A cancer-causing agent that has also been connected with an increase chance of contracting lung, bladder, and skin cancers.

  • Volatile Organic Chemical (V.O.C)
  • VOC scan is a gas chromatographic scan of 58 compounds. This list was determined by the Connecticut State Department of Health. These compounds include some of the more commonly found ground water contaminates.

  • Lead
  • Lead is a metal found in natural deposits, is commonly used in household plumbing materials and water service lines. The greatest exposure to lead is swallowing or breathing in lead paint chips and dust.

    Lead in drinking water can also cause a variety of adverse health effects. In babies and children, exposure to lead in drinking water above the action level can result in delays in physical and mental development, along with slight deficits in attention span and learning abilities. In adults, it can cause increases in blood pressure. Adults who drink this water over many years could develop kidney problems or high blood pressure.

    Lead is rarely found in source water, but enters tap water through corrosion of plumbing materials. Homes built before 1986 are more likely to have lead pipes, fixtures and solder. However, new homes are also at risk: even legally “lead-free” plumbing may contain up to 8 percent lead. The most common problem is with brass or chrome-plated brass faucets and fixtures which can leach significant amounts of lead into the water, especially hot water.

  • Radon
  • Radon gas can enter homes through the water supply. Radon dissolves and builds up in water from underground sources, such as wells. The radon in your water can enter the air in your home when you use water for household activities such as showering, washing clothes and cooking.

    Radon gas can enter homes through the water supply. Radon dissolves and builds up in water from underground sources, such as wells. The radon in your water can enter the air in your home when you use water for household activities such as showering, washing clothes and cooking.

    For every 10,000 picocuries per liter (pCi/L) of radon in your water, 1 pCi/L is added to your radon in the air. If your water comes from a lake, river, or reservoir (surface water), radon is not a concern. The radon is released into the air before it reaches your home.

    Some radon stays in the water. Radon in the water you drink can also contribute to a very small increase in your risk of stomach cancer. However this risk is almost insignificant compared to your risk of lung cancer from radon. If the level of radon in your drinking water is 5,000 pCi/L then mitigation is recommended.

Contact us to ensure the water you’re using on a daily basis is safe with testing done by experienced professionals!

For more information on water testing guidelines in Connecticut, please refer to the Connecticut Department of Public Health.


Victor D.
Our inspector, Frank, spent all the time we needed him to take not only inspecting the house, but also introducing us to well water! I am thankful we hired them, and I think you can’t get any better. The report we received from them was very professional, and it included photos and test results. I hope not to move again soon, but if I do I will hire them again.