Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Fond Du Lac, WI 54935
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Fond Du Lac County.
Historical measurement record needs context
- Largest possible serving system
- Fond Du Lac Waterworks
- Source water
- Groundwater
- County
- Fond Du Lac County
- Profile updated
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 →At a glance
What the current records say
EPA quarter 2026Q2
All possible systems
No active flag
0 active health-based records
Measurements by utility
Each result belongs to a specific system.
Utility match
6 systems
Serves 44,678 people system-wide
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
- 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
- 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)
| 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
- 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
- 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)
| 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
- 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)
| 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
- 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)
| 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
- 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)
| 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 |
Hardness estimate unavailable
No responsible local estimate yet
We did not find enough qualifying recent USGS hardness observations within 25 miles of this ZIP centroid. We leave the value blank instead of substituting a state average. Ask the serving utility or test the household tap for a property-specific result.
Evidence-first next steps
Confirm the problem before choosing treatment
This profile can help you ask the right question. It cannot select equipment for a property without a current result from the serving utility or the tap.
Confirm the serving system
ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.
Read the current utility report
A reported action-level record needs context. Check its monitoring period and the utility's current report.
Find an official utility report →Test for the decision you face
Ask the utility for hardness or test at the tap. For health concerns, use a certified laboratory and targeted analysis.
Convert your hardness test result →Nearby indexed reports
More local profiles in Fond Du Lac
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for Fond Du Lac
Is tap water safe in Fond Du Lac?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.
Do I need a water softener?+
Confirm hardness at your tap and consider actual scale or spotting before choosing treatment. Regional environmental values cannot determine whether you need a softener. A softener addresses hardness, not every contaminant.