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

Lithium in Connecticut Drinking Water

Lithium has been detected in water systems serving 6,169 ZIP codes nationwide. Here is what you need to know about lithium in your drinking water and how it may affect your household.

What Is Lithium?

Lithium is a naturally occurring alkali metal that dissolves into groundwater from lithium-bearing minerals in igneous and sedimentary rock. It is also released through industrial discharge from battery manufacturing and pharmaceutical production. The WHO drinking water guideline is 10 micrograms per liter. At elevated concentrations, lithium can affect the nervous system, thyroid function, and kidney health.

Is Lithium in Your Water?

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

Check Your ZIP Code

Health Effects of Lithium

Neurological and thyroid effects at high concentrations

Safety Guidelines

Health Guideline

0.01 mg/L

Source: WHO_DW_Guideline

Where Does Lithium Come From?

Natural deposits; industrial discharge

How to Reduce Lithium in Your Water

1Install a point-of-use reverse osmosis system certified to NSF/ANSI Standard 58, which effectively removes dissolved lithium through membrane rejection.
2Distillation units can reduce lithium concentrations since the metal remains in the boiling chamber while purified water is collected as steam.
3Standard activated carbon filters are not effective at removing lithium; ensure your chosen treatment method specifically addresses dissolved metals and minerals.
4Test your water through a certified laboratory to establish baseline lithium levels, and retest after installing treatment to confirm adequate reduction.

Who Is Most Vulnerable to Lithium?

The safe level of lithium 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 Lithium in my tap water?▾

Lithium has been detected in water systems across 6,169 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 Lithium is safe?▾

The safe level depends on who is drinking the water. The health guideline is 0.01 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 Lithium from my water?▾

Install a point-of-use reverse osmosis system certified to NSF/ANSI Standard 58, which effectively removes dissolved lithium through membrane rejection. Distillation units can reduce lithium concentrations since the metal remains in the boiling chamber while purified water is collected as steam. 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