Skip to content

City water profile

Hillsboro water quality

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

Median indexed hardness

264PPM

2 indexed ZIPs

Range 264–264 PPM

State comparison
21 PPM below
State hardness rank
#615 of 913
Matched utilities
3
Active health records
0

City summary

What the indexed records say

Hillsboro has 2 published ZIP profiles across Montgomery County. The indexed median is 264 PPM, compared with 285 PPM across Illinois.

Among the 913 Illinoiscities with an indexed median, Hillsboro ranks #615from highest to lowest. Across all 1,065 state ZIP profiles, available estimates run from 115to 408 PPM.

The 264–264 PPM range shows how much the available ZIP estimates vary within the city label. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

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
47.2 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 0Low: 2

Observation window: Jan 6, 2016 to Jun 9, 2026.

ZIP directory

Water reports in Hillsboro

Open a ZIP for site-level provenance and measurements.

ZIP code

62049

Very Hard

264 PPM

Nearest site
41.7 mi
Confidence
Low

View full ZIP evidence →

ZIP code

62051

Very Hard

264 PPM

Nearest site
47.2 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Hillsboro

PWSID IL1350300

Surface water
System population served
4,402
Last reported
May 27, 2026

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

Graham Correctional Site

PWSID IL1355100

Surface water
System population served
2,155
Last reported
May 27, 2026

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

Ej Water-Mcwc

PWSID IL1350020

Surface water
System population served
2,075
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.

RecordSystemPeriodStatus
Lead and Copper RuleIL1350300Jan 1, 2026Unaddressed
Public NoticeIL1350020Dec 26, 2025Resolved
Interim Enhanced Surface Water Treatment RuleIL1350020Dec 1, 2025Resolved · health-based
Interim Enhanced Surface Water Treatment RuleIL1350020Nov 1, 2025Resolved · health-based
Interim Enhanced Surface Water Treatment RuleIL1350020Oct 1, 2025Resolved · health-based
Lead and Copper RuleIL1350300Jul 1, 2025Unaddressed
NitrateIL1350300Apr 1, 2025Archived
NitriteIL1350300Apr 1, 2025Archived
TTHMIL1350300Jul 1, 2024Resolved
ToxapheneIL1350300Apr 1, 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 Hillsboro

Is the water hard?

The indexed city median is 264 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.