Water Hardness in Round Lake, IL
Illinois · 1 zip codes · 25 matched water systems
City avg (weighted): 150 PPM
Dataset updated March 9, 202625 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology
Is Round Lake, IL Water Hard or Soft?
The displayed hardness for Round Lake, IL is 148 PPM (8.7 GPG) from Waukegan, classified as moderately hard. The citywide weighted average is 150 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 25 matched water systems and 1 ZIP code. 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 Round Lake
These systems are matched to Round Lake, IL. 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 |
|---|---|---|---|
| Waukegan IL0971900 | surface water | 148 PPM Moderately HardUSGS estimate: 207 PPM | |
| Vernon Hills - Lake Co Pw IL0971750 | surface water | 148 PPM Moderately HardUSGS estimate: 227 PPM | |
| Mundelein IL0971150 | surface water | 148 PPM Moderately HardUSGS estimate: 227 PPM | |
| Gurnee IL0970350 | surface water | 148 PPM Moderately HardUSGS estimate: 227 PPM | |
| Highland Park IL0970500 | surface water | 148 PPM Moderately HardUSGS estimate: 207 PPM |
Zip Codes in Round Lake, IL
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 Round Lake, IL.
Frequently Asked Questions
How hard is the water in Round Lake, IL?
The citywide weighted average water hardness in Round Lake, IL is 150 PPM (8.8 GPG), classified as moderately hard. This is based on 25 matched water systems. The gauge highlights Waukegan, a verified treated-water system, because individual systems can differ from the citywide average.
Do I need a water softener in Round Lake, IL?
With a citywide average hardness of 150 PPM, a water softener is worth considering for homes in Round Lake. Confirm your tap reading before sizing equipment.
Is hard water in Round Lake, IL 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 Round Lake, IL?
Round Lake, Illinois is served by 25 matched water systems across 1 zip code.
Learn More About Your Water
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10 min readPPM to GPG Converter + Water Hardness Scale Explained
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