City water profile

Water hardness in Mattoon

Find official utility reports, understand hardness, and check the water system serving your home in Mattoon, Wisconsin.

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: Unavailable
Evidence comparison rank: —
Matched utilities: 1
Active health records: 0

Your tap water

What does the utility report?

Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.

Utility hardness unavailable in this index

Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.

Find an official utility report →

Convert a hardness result →Test your tap →

Match the name on your water bill

Your utility’s measurements and compliance records

These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.

EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.

Mattoon Waterworks

WI4590455 · Groundwater · 450 people served system-wide

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

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (2)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 1.4e-4 mg/L
Action level: 0.015 mg/L

1% of the listed benchmark

Monitoring period: Jun 1, 2023 to Sep 30, 2023

Copper (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Above action level

Reported level: 1.4 mg/L
Action level: 1.3 mg/L

108% of the listed benchmark

Monitoring period: Jul 1, 1997 to Dec 31, 1997

Violation history (5)

Imported violation history for Mattoon Waterworks
Rule	Status	Period
Public Notice	Resolved	Jul 16, 2023 to Jun 28, 2024
Revised Total Coliform RuleHealth-based	Resolved	Jul 16, 2023 to Aug 11, 2023
Revised Total Coliform Rule	Resolved	Jul 16, 2023 to Aug 11, 2023
Revised Total Coliform Rule	Resolved	Jul 1, 2022 to Jul 31, 2022
Lead and Copper Rule	Unaddressed	Jan 1, 2012

City summary

What the indexed records say

Mattoon has 1 published ZIP profile across Shawano County. The regional-evidence median is 281 PPM. The city does not meet the stricter comparison standard.

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

Soft0 ZIPs

Moderately hard0 ZIPs

Hard0 ZIPs

Very hard1 ZIP

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: 4.5 miles
Profiles with evidence: 1/1

Confidence labels

High: 1Moderate: 0Low: 0

Observation window: Aug 21, 2023 to Aug 7, 2024.

ZIP directory

Water reports in Mattoon

Open a ZIP for site-level provenance and measurements.

ZIP code

54450

Very Hard

280.5 PPM

Nearest site: 4.5 mi
Confidence: High

View full ZIP evidence →

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. Use a measured hardness result. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other Wisconsin communities

Birnamwood

Shawano County

281 PPM median

Bonduel

Shawano County

289 PPM median

Bowler

Shawano County

281 PPM median

Gresham

Shawano County

281 PPM median

Pulaski

Shawano County

118 PPM median

Shawano

Shawano County

289 PPM median

Search all 479 Wisconsin cities →

Questions people ask

About water in Mattoon

Is the water hard?

Check the utility-reported result above when available. Nearby environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

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.