Is my tap water safe to drink in Connecticut?

It depends on your ZIP code and who lives in your home. CheckYourTap analyzes 120+ contaminants in your local water supply and shows which ones exceed health guidelines — not just legal limits. Many contaminants are legal but still pose health risks, especially for babies, pregnant women, elderly, and pets.

What contaminants are in Connecticut tap water?

Connecticut tap water commonly contains disinfection byproducts (haloacetic acids, trihalomethanes), lead from aging pipes, PFAS (forever chemicals), nitrates, arsenic, and radionuclides like radium. The specific contaminants and levels vary by water system — enter your ZIP code to see your local results.

How does CheckYourTap differ from EWG or other water quality databases?

CheckYourTap is the only water quality report personalized for your household composition. Tell us who lives in your home — babies, children, pregnant women, elderly, dogs, or cats — and we calculate adjusted safe levels for each person. A contaminant safe for adults may exceed guidelines for infants by 8x or more.

Is CheckYourTap free?

Yes, CheckYourTap is completely free. Enter your Connecticut ZIP code and household members to get a personalized water quality report with health risk assessments for 120+ contaminants.

Does CheckYourTap cover well water in Connecticut?

Yes. CheckYourTap covers both city water (public water systems) and private well water in Connecticut. Well water reports use USGS groundwater data and include geology-based risk factors for arsenic, uranium, and radon specific to your area.

Contaminants in Connecticut Drinking Water

59 contaminants have been detected across Connecticut water systems, organized into 7 categories. Learn about health effects, safety guidelines, and who is most vulnerable.

Contaminants

What Is In Your Water?

Enter your ZIP code to see which of these contaminants are in your local water and how they affect your specific household.

Check Your ZIP Code

Heavy Metals(1)Inorganic Chemicals(12)PFAS (Forever Chemicals)(29)Radionuclides(2)Pesticides & Herbicides(8)Organic Chemicals(1)Other Compounds(6)

Heavy Metals

(1)

Toxic metals that accumulate in the body over time. Especially dangerous for children and developing fetuses.

Lead

Brain and nervous system damage, developmental delays in children, reduced IQ, behavioral problems, kidney damage, and reproductive harm. No safe level of lead exposure has been identified, especially for children under 6.

12,828 ZIPs

Inorganic Chemicals

(12)

Minerals and inorganic compounds from natural deposits, industrial discharge, and water treatment.

NitrateGuideline: 10 mg/L

Methemoglobinemia (blue baby syndrome) in infants under 6 months — prevents blood from carrying oxygen. Long-term exposure associated with increased risk of colorectal and other cancers in adults.

14,535 ZIPs

CopperGuideline: 0.3 mg/L

Short-term: gastrointestinal distress, nausea, vomiting. Long-term: liver and kidney damage. Wilson's disease patients and infants are especially vulnerable to copper toxicity.

13,906 ZIPs

BariumGuideline: 0.7 ppm

Increase in blood pressure

12,303 ZIPs

FluorideGuideline: 1 mg/L

Bone disease (pain and tenderness of the bones); children may get mottled teeth

12,026 ZIPs

Nitrate-NitriteGuideline: 10 mg/L

Combined nitrogen compounds that cause methemoglobinemia (blue baby syndrome) in infants. The combined measurement reflects total inorganic nitrogen in water.

11,086 ZIPs

ArsenicGuideline: 0.000004 mg/L

Skin damage or problems with circulatory systems, and may have increased risk of getting cancer

8,347 ZIPs

CadmiumGuideline: 0.00004 mg/L

Kidney damage

7,216 ZIPs

LithiumGuideline: 0.01 mg/L

Neurological and thyroid effects at high concentrations

6,169 ZIPs

AntimonyGuideline: 0.001 mg/L

Increase in blood cholesterol; decrease in blood sugar

4,387 ZIPs

ManganeseGuideline: 50 ppb

Harm to the brain and nervous system; change in behavior

3,845 ZIPs

Germanium

Kidney dysfunction, muscle weakness, anemia

3,845 ZIPs

NitriteGuideline: 1000 ug/L

More immediately toxic than nitrate. Causes methemoglobinemia in infants and can cause serious illness.

3,408 ZIPs

PFAS (Forever Chemicals)

(29)

Per- and polyfluoroalkyl substances that persist indefinitely in the environment and human body.

PFHxS

Part of the PFAS (per- and polyfluoroalkyl substances) family of 'forever chemicals.' Linked to cancer, immune system harm, hormone disruption, and developmental effects. Does not break down in the environment or the human body.

6,377 ZIPs

PFOAGuideline: 7e-9 mg/L

Cancer; harm to the immune system; hormone disruption; harm to fetal growth and child development; harm to the liver

6,377 ZIPs

PFNA

6,377 ZIPs

PFOSGuideline: 0.000001 mg/L

Cancer; harm to the immune system; hormone disruption; harm to fetal growth and child development; harm to the liver