Skip to content

City water profile

Wilmington water quality

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

Median indexed hardness

238PPM

2 indexed ZIPs

Range 211–265 PPM

State comparison
47 PPM below
State hardness rank
#804 of 913
Matched utilities
2
Active health records
0

City summary

What the indexed records say

Wilmington has 2 published ZIP profiles across Will County and Greene County. The indexed median is 238 PPM, compared with 285 PPM across Illinois.

Among the 913 Illinoiscities with an indexed median, Wilmington ranks #804from highest to lowest. Across all 1,065 state ZIP profiles, available estimates run from 115to 408 PPM.

The 211–265 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
13.5 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 2Low: 0

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

ZIP directory

Water reports in Wilmington

Open a ZIP for site-level provenance and measurements.

ZIP code

60481

Very Hard

265 PPM

Nearest site
13.5 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

62078

Very Hard

211 PPM

Nearest site
12.4 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Wilmington

PWSID IL1971100

Surface water
System population served
5,700
Last reported
May 27, 2026

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

Patterson (inc As Wilmington)

PWSID IL0610450

Groundwater
System population served
320
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 RULE REVISIONSIL1971100Jul 2, 2025Unaddressed
Revised Total Coliform RuleIL1971100Feb 1, 2025Resolved
ChloramineIL1971100Feb 1, 2025Resolved
Interim Enhanced Surface Water Treatment RuleIL1971100Feb 1, 2024Resolved
Interim Enhanced Surface Water Treatment RuleIL1971100Jan 1, 2024Resolved
Surface Water Treatment RuleIL1971100Jan 1, 2024Resolved
Consumer Confidence RuleIL1971100Jul 10, 2023Resolved
TTHMIL1971100Apr 1, 2023Resolved
Total Haloacetic Acids (HAA5)IL1971100Apr 1, 2023Resolved
ToxapheneIL1971100Jan 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 Wilmington

Is the water hard?

The indexed city median is 238 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.