Is tap water safe in Annawan?

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 Annawan, IL?

Nearby USGS observations produce an estimate of 274 ppm (16 grains per gallon), classified as very hard. This is not a tap measurement.

Do I need a water softener in ZIP code 61344?

At 274 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

Annawan water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Annawan, Illinois.

Median indexed hardness

273PPM

2 indexed ZIPs

Range 271–274 PPM

State comparison: 12 PPM below
State hardness rank: #572 of 913
Matched utilities: 1
Active health records: 0

City summary

What the indexed records say

Annawan has 2 published ZIP profiles across Henry County and Bureau County. The indexed median is 273 PPM, compared with 285 PPM across Illinois.

Among the 913 Illinoiscities with an indexed median, Annawan ranks #572from highest to lowest. Across all 1,065 state ZIP profiles, available estimates run from 115to 408 PPM.

The 271–274 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 hard2 ZIPs

2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 13.8 miles
Profiles with evidence: 2/2

Confidence labels

High: 0Moderate: 2Low: 0

Observation window: May 22, 2017 to Oct 25, 2017.

ZIP directory

Water reports in Annawan

Open a ZIP for site-level provenance and measurements.

ZIP code

61234

Very Hard

271 PPM

Nearest site: 13.3 mi
Confidence: Moderate

View full ZIP evidence →

ZIP code

61344

Very Hard

274 PPM

Nearest site: 13.8 mi
Confidence: Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Annawan

PWSID IL0730150

Groundwater

System population served: 843
Last reported: May 27, 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
LEAD AND COPPER RULE REVISIONS	IL0730150	Oct 17, 2024	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 Illinois communities

Alpha

Henry County

288 PPM median

Andover

Henry County

286 PPM median

Atkinson

Henry County

278 PPM median

Bishop Hill

Henry County

282 PPM median

Cambridge

Henry County

281 PPM median

Colona

Henry County

281 PPM median

Search all 913 Illinois cities →

Questions people ask

About water in Annawan

Is the water hard?

The indexed city median is 273 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.