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City water profile

Watertown water quality

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

Median indexed hardness

52PPM

One indexed ZIP

Range 52.4–52.4 PPM

State comparison
1 PPM below
State hardness rank
#31 of 52
Matched utilities
4
Active health records
0

City summary

What the indexed records say

Watertown has 1 published ZIP profile across Litchfield County. The indexed median is 52 PPM, compared with 53 PPM across Connecticut.

Among the 52 Connecticutcities with an indexed median, Watertown ranks #31from 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

Soft1 ZIP
Moderately hard0 ZIPs
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
3.6 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

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

ZIP directory

Water reports in Watertown

Open a ZIP for site-level provenance and measurements.

ZIP code

06795

Soft

52.4 PPM

Nearest site
3.6 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Waterbury Water Department

PWSID CT1510011

Surface water
System population served
107,271
Last reported
Jun 29, 2026

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

Watertown Water & Sewer Authority

PWSID CT1530021

Surface water
System population served
9,972
Last reported
Jun 29, 2026

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

Watertown Fire District

PWSID CT1530011

Groundwater
System population served
6,718
Last reported
Jun 29, 2026

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

Watertown Water & Sewer - Westgate

PWSID CT1539031

Groundwater
System population served
600
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
Lead and Copper RuleCT1510011Dec 30, 2025Resolved
Consumer Confidence RuleCT1530021Aug 10, 2025Resolved
Consumer Confidence RuleCT1539031Aug 10, 2025Resolved
Lead and Copper RuleCT1530021Dec 30, 2024Resolved
Lead and Copper RuleCT1539031Dec 30, 2024Resolved
Consumer Confidence RuleCT1510011Jul 1, 2024Resolved
Consumer Confidence RuleCT1530021Jul 1, 2024Resolved
Consumer Confidence RuleCT1539031Jul 1, 2024Resolved
E. COLICT1530011Aug 22, 2023Unaddressed
Consumer Confidence RuleCT1530021Aug 10, 2023Resolved

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 Watertown

Is the water hard?

The indexed city median is 52 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.