Norwalk Tap Water Quality Report
Norwalk's water has 2 contaminants above EPA MCLGs. Consider using a certified water filter for additional protection.
No single water system serves most of Norwalk (93,661 residents, Census 2024 estimate). Its large systems are NORWALK FIRST TAXING DISTRICT (EPA counts 40,256 people served, about 43% of Norwalk's population); AQUARION WATER CO OF CT-MAIN SYSTEM (EPA counts 351,756 people served, more than Norwalk's population); SOUTH NORWALK ELECTRIC & WATER (EPA counts 42,000 people served, about 45% of Norwalk's population). EPA's counts may include people served outside Norwalk, so each share is at most that. Check which one bills you: each system's figures are shown separately below.
- NORWALK FIRST TAXING DISTRICT: 23 contaminants tested, 2 above EPA MCLGs; health-based violations since 2020: 0
- AQUARION WATER CO OF CT-MAIN SYSTEM: 157 contaminants tested, 4 above EPA MCLGs; health-based violations since 2020: 0
- SOUTH NORWALK ELECTRIC & WATER: 23 contaminants tested, 0 above EPA MCLGs; health-based violations since 2020: 0
1 other system serving parts of Norwalk reports results above guidelines — check which system bills you. AQUARION WATER CO OF CT-MAIN SYSTEM (4 above guidelines)
Water systems
3 large systems
Residents (Census 2024)
93,661
Health-based violations since 2020
0
NORWALK FIRST TAXING DISTRICT. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Is Norwalk Tap Water Safe to Drink?
We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems. Norwalk's water has 2 contaminants above EPA health-based guidelines (MCLGs), while it meets federal legal limits.
NORWALK FIRST TAXING DISTRICT, Norwalk's water system, serves 40,256 people. 2 other systems also serve parts of Norwalk. Each system's results are listed under its own name, never added to NORWALK FIRST TAXING DISTRICT's. Water quality testing is conducted regularly and reported to the EPA.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Connecticut
Norwalk Water Service Areas
What these numbers actually mean for Norwalk, CT
We read Norwalk, CT’s published record and send you a short report — which findings warrant a decision, which to ignore, and what to do about it. Including when the answer is nothing.
- 2 contaminants above EPA MCLGs
- 23 results on file
- 23 PFAS compounds on record
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Recommended Water Filters for Norwalk
Based on Norwalk's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.
Culligan
ZeroWater
NSF Certified:
Flow Rate
1.9 gpm
Daily Production
1 gpd
Highlights:
- Compact design
- Easy to set up
- Affordable
- NSF-42, NSF-53, NSF-401 certified
Removes 19 contaminants:
+14 more
Strontium, Molybdenum, Fluoride, Uranium, Lead, Total PFAS, Chlorine, 25, Phosphorus, Bicarbonate, Calcium, Carbonate, Magnesium, Sodium
Santevia
Bath Filter
NSF Certified:
Flow Rate
0.36 gpm
Highlights:
- Organic cotton design reduces plastic used in construction
- Affordable upfront & ongoing cost
- The only bath filter that removed 100% chlorine with “normal” faster faucet flow
Removes 1 contaminants:
Waterdrop
A1
NSF Certified:
Flow Rate
1 gpm
Highlights:
- Performance certified
- Lower price than Philips
- Hot water dispensing
- Compact design
Removes 5 contaminants:
Whirlpool Corporation
W11256135
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.7 gpm
Removes 19 contaminants:
+14 more
Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Tetrachloroethylene, Toxaphene, Turbidity
Test Your Water Quality
Professional laboratory testing provides accurate, detailed analysis of your drinking water.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
PFAS Forever Chemicals Test
$339.95
Specialized test for PFOA, PFOS, and 24 other forever chemicals. Essential for areas near military bases, airports, or industrial sites.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
On a private well near Norwalk? Public-water results do not apply to private wells. See Western Connecticut Planning Region well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Frequently Asked Questions About Norwalk Tap Water
Norwalk's water has 2 contaminants above EPA MCLGs. While the water meets federal legal limits, we recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach NORWALK FIRST TAXING DISTRICT. For a problem with your water now (discolored water, no water, low pressure, a leak), contact NORWALK FIRST TAXING DISTRICT directly.
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