City water profile

Water hardness in Fond Du Lac

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

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: Unavailable
Evidence comparison rank: —
Matched utilities: 6
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.

Fond Du Lac Waterworks

WI4200469 · Groundwater · 44,678 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: 0.0061 mg/L
Action level: 0.015 mg/L

41% of the listed benchmark

Monitoring period: Jul 1, 2025 to Dec 31, 2025

Copper (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Above action level

Reported level: 1.484 mg/L
Action level: 1.3 mg/L

114% of the listed benchmark

Monitoring period: Jul 1, 1992 to Dec 31, 1992

Violation history (2)

Imported violation history for Fond Du Lac Waterworks
Rule	Status	Period
Public Notice	Resolved	Oct 17, 2024 to Jun 12, 2025
LEAD AND COPPER RULE REVISIONSHealth-based	Resolved	Oct 17, 2024 to Mar 25, 2025

Ashwood Grove Edgewater

WI4200485 · Groundwater · 1,046 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 (1)

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: 0.0016 mg/L
Action level: 0.015 mg/L

11% of the listed benchmark

Monitoring period: Jun 1, 2024 to Sep 30, 2024

Violation history (0)

No record returned in this imported window. This is not a guarantee of tap-water safety.

Fond Du Lac Tn Water Utility

WI4200429 · Groundwater · 980 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 (1)

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: 0.0036 mg/L
Action level: 0.015 mg/L

24% of the listed benchmark

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

Violation history (5)

Imported violation history for Fond Du Lac Tn Water Utility
Rule	Status	Period
Public Notice	Resolved	Oct 17, 2024 to May 6, 2025
LEAD AND COPPER RULE REVISIONS	Resolved	Oct 17, 2024 to Dec 26, 2024
LEAD AND COPPER RULE REVISIONSHealth-based	Resolved	Oct 17, 2024 to Sep 10, 2025
Public Notice	Unaddressed	Oct 17, 2024
Lead and Copper Rule	Resolved	Feb 1, 2021 to Feb 22, 2021

Woodland Park

WI4200798 · Groundwater · 66 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 (1)

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: 8.0e-4 mg/L
Action level: 0.015 mg/L

5% of the listed benchmark

Monitoring period: Jun 1, 2024 to Sep 30, 2024

Violation history (5)

Imported violation history for Woodland Park
Rule	Status	Period
Public Notice	Unaddressed	Jul 31, 2013
Public Notice	Unaddressed	Feb 27, 2013
Public Notice	Unaddressed	Nov 21, 2012
Public Notice	Unaddressed	Jul 20, 2012
Public Notice	Unaddressed	Jul 1, 2011

Mary Hill Park Sanitary Dist

WI4200465 · Groundwater · 65 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 (1)

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: 0.0079 mg/L
Action level: 0.015 mg/L

52% of the listed benchmark

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

Violation history (2)

Imported violation history for Mary Hill Park Sanitary Dist
Rule	Status	Period
LEAD AND COPPER RULE REVISIONS	Resolved	Oct 17, 2024 to Oct 17, 2024
Public Notice	Unaddressed	Aug 1, 2010

Colonial Gardens Homes

WI4200484 · Groundwater · 48 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 (1)

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: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jun 1, 2025 to Sep 30, 2025

Violation history (52)

Imported violation history for Colonial Gardens Homes
Rule	Status	Period
Revised Total Coliform Rule	Resolved	Dec 1, 2024 to Dec 31, 2024
Revised Total Coliform Rule	Resolved	Nov 1, 2024 to Nov 30, 2024
Revised Total Coliform Rule	Resolved	Oct 1, 2024 to Oct 31, 2024
Revised Total Coliform Rule	Resolved	Sep 1, 2024 to Sep 30, 2024
Lead and Copper Rule	Resolved	Jun 1, 2024 to Aug 25, 2025
Revised Total Coliform Rule	Resolved	Jun 1, 2024 to Jun 30, 2024
Nitrate	Resolved	Jan 1, 2024 to Dec 31, 2024
Carbon tetrachloride	Resolved	Jan 1, 2024 to Dec 31, 2024
1,1,1-Trichloroethane	Resolved	Jan 1, 2024 to Dec 31, 2024
1,1-Dichloroethylene	Resolved	Jan 1, 2024 to Dec 31, 2024
cis-1,2-Dichloroethylene	Resolved	Jan 1, 2024 to Dec 31, 2024
1,2,4-Trichlorobenzene	Resolved	Jan 1, 2024 to Dec 31, 2024
Trichloroethylene	Resolved	Jan 1, 2024 to Dec 31, 2024
Benzene	Resolved	Jan 1, 2024 to Dec 31, 2024
CHLOROBENZENE	Resolved	Jan 1, 2024 to Dec 31, 2024
Tetrachloroethylene	Resolved	Jan 1, 2024 to Dec 31, 2024
Dinoseb	Resolved	Jan 1, 2024 to Dec 31, 2024
BHC-GAMMA	Resolved	Jan 1, 2024 to Dec 31, 2024
Heptachlor epoxide	Resolved	Jan 1, 2024 to Dec 31, 2024
Simazine	Resolved	Jan 1, 2024 to Dec 31, 2024
Endothall	Resolved	Jan 1, 2024 to Dec 31, 2024
Diquat	Resolved	Jan 1, 2024 to Dec 31, 2024
Carbofuran	Resolved	Jan 1, 2024 to Dec 31, 2024
Methoxychlor	Resolved	Jan 1, 2024 to Dec 31, 2024
Toxaphene	Resolved	Jan 1, 2024 to Dec 31, 2024
Heptachlor	Resolved	Jan 1, 2024 to Dec 31, 2024
Hexachlorocyclopentadiene	Resolved	Jan 1, 2024 to Dec 31, 2024
Endrin	Resolved	Jan 1, 2024 to Dec 31, 2024
HEXACHLOROBENZENE	Resolved	Jan 1, 2024 to Dec 31, 2024
OXAMYL	Resolved	Jan 1, 2024 to Dec 31, 2024
Chlordane	Resolved	Jan 1, 2024 to Dec 31, 2024
Pentachlorophenol	Resolved	Jan 1, 2024 to Dec 31, 2024
2,4,5-TP	Resolved	Jan 1, 2024 to Dec 31, 2024
2,4-D	Resolved	Jan 1, 2024 to Dec 31, 2024
Dalapon	Resolved	Jan 1, 2024 to Dec 31, 2024
Atrazine	Resolved	Jan 1, 2024 to Dec 31, 2024
Glyphosate	Resolved	Jan 1, 2024 to Dec 31, 2024
Vinyl chloride	Resolved	Jan 1, 2024 to Dec 31, 2024
DICHLOROMETHANE	Resolved	Jan 1, 2024 to Dec 31, 2024
1,2-Dichloroethane	Resolved	Jan 1, 2024 to Dec 31, 2024
o-Dichlorobenzene	Resolved	Jan 1, 2024 to Dec 31, 2024
trans-1,2-Dichloroethylene	Resolved	Jan 1, 2024 to Dec 31, 2024
p-Dichlorobenzene	Resolved	Jan 1, 2024 to Dec 31, 2024
1,1,2-Trichloroethane	Resolved	Jan 1, 2024 to Dec 31, 2024
Toluene	Resolved	Jan 1, 2024 to Dec 31, 2024
Ethylbenzene	Resolved	Jan 1, 2024 to Dec 31, 2024
LASSO	Resolved	Jan 1, 2024 to Dec 31, 2024
Xylenes, Total	Resolved	Jan 1, 2024 to Dec 31, 2024
Picloram	Resolved	Jan 1, 2024 to Dec 31, 2024
1,2-Dichloropropane	Resolved	Jan 1, 2024 to Dec 31, 2024
Styrene	Resolved	Jan 1, 2024 to Dec 31, 2024
Nitrate	Resolved	Jan 1, 2023 to Nov 15, 2023

City summary

What the indexed records say

Fond Du Lac has 2 published ZIP profiles across Fond Du Lac County. The regional-evidence median is 417 PPM. The city does not meet the stricter comparison standard.

The 417–417 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 hard1 ZIP

1 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: 23 miles
Profiles with evidence: 1/2

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Aug 5, 2024 to Aug 5, 2024.

ZIP directory

Water reports in Fond Du Lac

Open a ZIP for site-level provenance and measurements.

ZIP code

54935

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

ZIP code

54937

Very Hard

417 PPM

Nearest site: 23 mi
Confidence: Low

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

Brandon

Fond Du Lac County

135 PPM median

Campbellsport

Fond Du Lac County

421 PPM median

Eden

Fond Du Lac County

417 PPM median

Fairwater

Fond Du Lac County

135 PPM median

Mount Calvary

Fond Du Lac County

417 PPM median

Ripon

Fond Du Lac County

169 PPM median

Search all 479 Wisconsin cities →

Questions people ask

About water in Fond Du Lac

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.