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.

Inorganics

Arsenic in Connecticut Drinking Water

Arsenic has been detected in water systems serving 8,347 ZIP codes nationwide. Here is what you need to know about arsenic in your drinking water and how it may affect your household.

What Is Arsenic?

Arsenic is a naturally occurring metalloid found in bedrock that dissolves into groundwater, particularly in areas with volcanic or sedimentary geology. Industrial sources include mining, pesticide residues, and wood preservatives. The EPA maximum contaminant level is 10 parts per billion. Long-term exposure to arsenic in drinking water increases the risk of bladder, lung, and skin cancers, as well as cardiovascular disease.

Is Arsenic in Your Water?

Enter your Connecticut ZIP code to find out if arsenic is in your local water — and see personalized health risks for your household.

Check Your ZIP Code

Health Effects of Arsenic

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

Safety Guidelines

Health Guideline

0.000004 mg/L

Source: CA_OEHHA_PHG

Legal Limit (MCL)

0.01 mg/L

EPA Maximum Contaminant Level

Where Does Arsenic Come From?

Erosion of natural deposits; runoff from orchards; runoff from glass & electronics production wastes

How to Reduce Arsenic in Your Water

1Install a point-of-use reverse osmosis system certified to NSF/ANSI Standard 58 for arsenic reduction, which effectively removes both arsenic III and arsenic V forms when paired with an oxidation prefilter.
2Use an adsorptive media filter containing iron-based media such as granular ferric hydroxide, which has high affinity for arsenic and is effective for whole-house treatment.
3For well water, add an oxidation step (chlorination or aeration) before filtration to convert arsenic III to arsenic V, which is more readily removed by most filter technologies.
4Test your water to determine the specific arsenic species present, as treatment effectiveness varies between arsenic III (arsenite) and arsenic V (arsenate).

Who Is Most Vulnerable to Arsenic?

The safe level of arsenic varies significantly depending on who is drinking the water. CheckYourTap calculates adjusted safe levels for each member of your household:

Infants (under 1 year)

Toddlers (1-3 years)

Children (4-11 years)

Pregnant women

Elderly (65+)

Adults

Dogs

Cats

A contaminant level that is safe for an adult may exceed guidelines for an infant by 4-8x or more. Check your ZIP code to see personalized results.

Frequently Asked Questions

Is Arsenic in my tap water?▾

Arsenic has been detected in water systems across 8,347 ZIP codes. Whether it's in your specific water depends on your local water system. Enter your CT ZIP code at CheckYourTap.com for a free, instant report.

What level of Arsenic is safe?▾

The safe level depends on who is drinking the water. The health guideline is 0.000004 mg/L, but infants, pregnant women, and pets may need much lower levels. CheckYourTap calculates adjusted safe levels for 11 different household member types.

How do I remove Arsenic from my water?▾

Install a point-of-use reverse osmosis system certified to NSF/ANSI Standard 58 for arsenic reduction, which effectively removes both arsenic III and arsenic V forms when paired with an oxidation prefilter. Use an adsorptive media filter containing iron-based media such as granular ferric hydroxide, which has high affinity for arsenic and is effective for whole-house treatment. For a personalized consultation, contact Valiant Energy Solutions at (475) 557-5107.

Related Contaminants

Nitrate Copper Lead Barium Fluoride

Check Water Quality by ZIP Code

Hartford 06103 New Haven 06510 Bridgeport 06604 Stamford 06901 Waterbury 06702 Norwalk 06850 Danbury 06810 Manchester 06040 View all cities →

View all contaminants in Connecticut water

About This Report

This water quality report is compiled from public records filed with the U.S. Environmental Protection Agency, state health departments, and the U.S. Geological Survey. Contaminant levels are evaluated against EPA federal standards and health-based guidelines from leading environmental and public health organizations. CheckYourTap is a service of Valiant Energy Solutions, a Connecticut water quality and energy services company established in 1930.

EPA SDWISUSGS NWISEWG Tap Water DatabaseCA OEHHA Public Health GoalsWHO Drinking Water Guidelines

Last updated March 2026