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City water profile

Westerly water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Westerly, Rhode Island.

Median indexed hardness

59PPM

One indexed ZIP

Range 59.1–59.1 PPM

State comparison
16 PPM above
State hardness rank
#3 of 12
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Westerly has 1 published ZIP profile across Washington County. The indexed median is 59 PPM, compared with 43 PPM across Rhode Island.

Among the 12 Rhode Islandcities with an indexed median, Westerly ranks #3from highest to lowest. Across all 33 state ZIP profiles, available estimates run from 40.5to 64.1 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
3.8 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: May 11, 2016 to Dec 2, 2025.

ZIP directory

Water reports in Westerly

Open a ZIP for site-level provenance and measurements.

ZIP code

02891

Soft

59.1 PPM

Nearest site
3.8 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Westerly Water Department

PWSID RI1559512

Groundwater
System population served
35,298
Last reported
May 26, 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 RuleRI1559512Jan 1, 2025Unaddressed
1,2,4-TrichlorobenzeneRI1559512Jul 1, 2024Resolved
cis-1,2-DichloroethyleneRI1559512Jul 1, 2024Resolved
DICHLOROMETHANERI1559512Jul 1, 2024Resolved
p-DichlorobenzeneRI1559512Jul 1, 2024Resolved
1,1-DichloroethyleneRI1559512Jul 1, 2024Resolved
trans-1,2-DichloroethyleneRI1559512Jul 1, 2024Resolved
1,1,1-TrichloroethaneRI1559512Jul 1, 2024Resolved
Carbon tetrachlorideRI1559512Jul 1, 2024Resolved
1,2-DichloropropaneRI1559512Jul 1, 2024Resolved

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 Westerly

Is the water hard?

The indexed city median is 59 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.