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City water profile

New Haven water quality

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

Median indexed hardness

58PPM

6 indexed ZIPs

Range 52.7–64.3 PPM

State comparison
5 PPM above
State hardness rank
#25 of 52
Matched utilities
1
Active health records
0

City summary

What the indexed records say

New Haven has 6 published ZIP profiles across New Haven County. The indexed median is 58 PPM, compared with 53 PPM across Connecticut.

Among the 52 Connecticutcities with an indexed median, New Haven ranks #25from highest to lowest. Across all 98 state ZIP profiles, available estimates run from 42.8to 114 PPM.

The 52.7–64.3 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft4 ZIPs
Moderately hard2 ZIPs
Hard0 ZIPs
Very hard0 ZIPs

6 of 6 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
7.3 miles
Profiles with evidence
6/6

Confidence labels

High: 0Moderate: 6Low: 0

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

ZIP directory

Water reports in New Haven

Open a ZIP for site-level provenance and measurements.

ZIP code

06510

Soft

59.6 PPM

Nearest site
8 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

06511

Soft

56.6 PPM

Nearest site
7.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

06513

Soft

52.7 PPM

Nearest site
7.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

06514

Soft

56.5 PPM

Nearest site
3.7 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

06515

Moderately Hard

64.3 PPM

Nearest site
7.3 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

06519

Moderately Hard

63.4 PPM

Nearest site
8.9 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Regional Water Authority

PWSID CT0930011

Surface water
System population served
418,900
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.

No violation records are included in the current lookback window.

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 Haven

Is the water hard?

The indexed city median is 58 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.