Water Hardness in Fond Du Lac, WI
Wisconsin · 2 zip codes · 7 matched water systems
City avg (weighted): 300 PPM
Dataset updated March 9, 20267 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology
Is Fond Du Lac, WI Water Hard or Soft?
The displayed hardness for Fond Du Lac, WI is 300 PPM (17.5 GPG) from Fond Du Lac Waterworks, classified as very hard. The citywide weighted average is 300 PPM.
Water hardness is not a drinking-water safety score. It measures calcium and magnesium minerals, and address-level results can shift by pressure zone, supply blend, building plumbing, or private well.
How this city reading is built
This city reading is a weighted rollup across 7 matched water systems and 2 ZIP codes. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.
Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.
Water Systems in Fond Du Lac
These systems are matched to Fond Du Lac, WI. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
| Fond Du Lac Waterworks WI4200469 | groundwater | 300 PPM Very HardUSGS estimate: 382 PPM | |
| North Fond Du Lac Waterworks WI4200405 | groundwater | 300 PPM Very HardUSGS estimate: 334 PPM | |
| Ashwood Grove Edgewater WI4200485 | groundwater | 300 PPM Very HardUSGS estimate: 334 PPM | |
| Fond Du Lac Tn Water Utility WI4200429 | groundwater | 300 PPM Very HardUSGS estimate: 334 PPM | |
| Mary Hill Park Sanitary Dist WI4200465 | groundwater | 300 PPM Very HardUSGS estimate: 334 PPM |
Zip Codes in Fond Du Lac, WI
What This Means For You
Use this city reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.
Know your water hardness?
If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Fond Du Lac, WI.
Frequently Asked Questions
How hard is the water in Fond Du Lac, WI?
The citywide weighted average water hardness in Fond Du Lac, WI is 300 PPM (17.5 GPG), classified as very hard. This is based on 7 matched water systems.
Do I need a water softener in Fond Du Lac, WI?
With a citywide average hardness of 300 PPM, a water softener is recommended for homes in Fond Du Lac. Confirm your tap reading before sizing equipment.
Is hard water in Fond Du Lac, WI safe to drink?
Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.
How many water systems serve Fond Du Lac, WI?
Fond Du Lac, Wisconsin is served by 7 matched water systems across 2 zip codes.
Learn More About Your Water
How to Test Water Hardness at Home
Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.
8 min readWater Hardness Scale: PPM and GPG Chart
Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.
10 min readWell Water Hardness: Why It's Usually Hard & How to Treat It
Well water is almost always harder than city water. Learn why, how to test your well, and the best treatment options for hard well water.
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