Is tap water safe in Hammond?

EPA SDWIS shows no active health-based violation in this profile's reporting window. That is not the same as proving every contaminant is absent, and federal data can lag state and utility records.

How hard is the water in Hammond, IN?

Nearby USGS observations produce an estimate of 280 ppm (16.4 grains per gallon), classified as very hard. This is not a tap measurement.

Do I need a water softener in ZIP code 46320?

At 280 ppm, a correctly sized whole-house softener can reduce scale buildup and hard-water spotting. Treatment for hardness does not remove all health-related contaminants.

City water profile

Hammond water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Hammond, Indiana.

Median indexed hardness

280PPM

5 indexed ZIPs

Range 265–280 PPM

State comparison: 33 PPM below
State hardness rank: #295 of 386
Matched utilities: 1
Active health records: 0

City summary

What the indexed records say

Hammond has 5 published ZIP profiles across Lake County. The indexed median is 280 PPM, compared with 313 PPM across Indiana.

Among the 386 Indianacities with an indexed median, Hammond ranks #295from highest to lowest. Across all 472 state ZIP profiles, available estimates run from 132to 371 PPM.

The 265–280 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard0 ZIPs

Hard0 ZIPs

Very hard5 ZIPs

5 of 5 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 4.5 miles
Profiles with evidence: 5/5

Confidence labels

High: 0Moderate: 5Low: 0

Hammond Water Works Department

PWSID IN5245020

Surface water

System population served: 78,384
Last reported: Jun 30, 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.

Record	System	Period	Status
Atrazine	IN5245020	Oct 1, 2024	Resolved
LASSO	IN5245020	Oct 1, 2024	Resolved
Di(2-ethylhexyl) phthalate	IN5245020	Oct 1, 2024	Resolved
Di(2-ethylhexyl) adipate	IN5245020	Oct 1, 2024	Resolved
Simazine	IN5245020	Oct 1, 2024	Resolved
Revised Total Coliform Rule	IN5245020	Aug 1, 2021	Resolved
Lead and Copper Rule	IN5245020	Jul 1, 2021	Resolved

Practical next steps

Move from index to evidence

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

Continue comparing

Other Indiana communities

Cedar Lake

Lake County

261 PPM median

Crown Point

Lake County

280 PPM median

Dyer

Lake County

265 PPM median

East Chicago

Lake County

280 PPM median

Gary

Lake County

265 PPM median

Griffith

Lake County

265 PPM median

Search all 386 Indiana cities →

Questions people ask

About water in Hammond

Is the water hard?

The indexed city median is 280 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.