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City water profile

New Canaan water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for New Canaan, Connecticut.

Median indexed hardness

90PPM

One indexed ZIP

Range 89.8–89.8 PPM

State comparison
37 PPM above
State hardness rank
#8 of 52
Matched utilities
5
Active health records
0

City summary

What the indexed records say

New Canaan has 1 published ZIP profile across Fairfield County. The indexed median is 90 PPM, compared with 53 PPM across Connecticut.

Among the 52 Connecticutcities with an indexed median, New Canaan ranks #8from highest to lowest. Across all 98 state ZIP profiles, available estimates run from 42.8to 114 PPM.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard1 ZIP
Hard0 ZIPs
Very hard0 ZIPs

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
4.2 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Jan 4, 2016 to Jun 3, 2026.

ZIP directory

Water reports in New Canaan

Open a ZIP for site-level provenance and measurements.

ZIP code

06840

Moderately Hard

89.8 PPM

Nearest site
4.2 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Aquarion-Eastern Fairfield County

PWSID CT0150011

Surface water
System population served
351,756
Last reported
Jun 29, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

South Norwalk Electric & Water

PWSID CT1030021

Surface water
System population served
42,000
Last reported
Jun 29, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Norwalk First Taxing District

PWSID CT1030011

Surface water
System population served
40,256
Last reported
Jun 29, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Aquarion-Darien

PWSID CT0350011

Surface water
System population served
18,737
Last reported
Jun 29, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Aquarion-New Canaan

PWSID CT0900011

Surface water
System population served
10,097
Last reported
Jun 29, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Compliance history

What EPA records show

No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
Consumer Confidence RuleCT1030021Aug 10, 2024Resolved
Consumer Confidence RuleCT1030021Jul 1, 2024Resolved
Lead and Copper RuleCT1030011Dec 30, 2021Resolved
Public NoticeCT0900011Oct 22, 2021Resolved
ArsenicCT0150011Jan 1, 2021Archived
BariumCT0150011Jan 1, 2021Archived
ChromiumCT0150011Jan 1, 2021Archived
CYANIDECT0150011Jan 1, 2021Archived
Antimony, TotalCT0150011Jan 1, 2021Archived
Beryllium, TotalCT0150011Jan 1, 2021Archived

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in New Canaan

Is the water hard?

The indexed city median is 90 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.