Norwalk, Connecticut

Norwalk, Connecticut Norwalk, Connecticut

Water Quality in Norwalk, Connecticut

Watershed: Norwalk River – Frontal Norwalk Harbor

What is the water quality like in Norwalk, CT?

Let’s dive deeper into what’s in Norwalk water.

What’s in Norwalk water?

Here are the top 5 chemical compounds in your water and what health issues they can potentially cause:

  1. Bromodichloromethane – Potential effect: Cancer
  2. Chloroform – Potential effect: Cancer
  3. Haloacetic acids – Potential effect: Cancer
  4. Nitrate – Potential effect: Cancer
  5. Total trihalomethanes – Potential effect: Cancer

These are five of the 13 contaminants analyzed by the Environmental Working Group (

7 of these contaminants are rated as exceeding EWG Health Guidelines.

See the What Can You Do? section below for all of the contaminants you can filter out and how to do it.

Where does Norwalk’s water come from?

Norwalk’s water comes from the Norwalk River – Frontal Norwalk Harbor watershed.

15 of the 19 water sources in the Norwalk River – Frontal Norwalk Harbor watershed are in Impaired or Unknown condition. These include:

  • Comstock Brook – one section
  • Cooper Pond Brook – two sections
  • Norwalk Harbor
  • Norwalk River – five sections
  • Ridgefield Brook – two sections

Ideally, a water source would be rated in Good condition. Comstock Brook (one section), Norwalk River (two sections), Popes Pond, and Silvermine River are in Good condition.

Whether a water source is in Impaired or Good condition refers to the quality of these uses:

  1. Drinking Water
  2. Aquatic Life
  3. Fish and Shellfish Consumption
  4. Recreation

Learn more from How’s My Waterway

See below for what you can do to improve Norwalk’s water.

Conclusion – What Can You Do?

Information about water quality can be surprising.

But there’s no reason to lose hope. There are things you can do in your household as well as things you can do at a community level.

In Your Household:

*Chlorination is an effective method of disinfecting/treating drinking water. You can then use a water filter to reduce the effects of chlorination byproducts to get the safest, cleanest water possible.

In Your Community:

Contact your local government officials and put pressure on them to invest in cleaner waterways and upgraded city water filtration and treatment.

Go to: to find contact information for your local officials.

Water Quality in Other Connecticut Cities

Connecticut Water Quality Page

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