Water Hardness in 48091
Warren, Michigan · Macomb County
Dataset updated March 9, 2026Matched to 14 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 14 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.
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 Serving 48091
These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
Warren, City Of MI0006900 | surface water | 110 PPM Slightly HardUSGS estimate: 217 PPM | |
Sterling Heights, City Of MI0006385 | surface water | 110 PPM Slightly HardUSGS estimate: 217 PPM | |
Clinton Township MI0001480 | surface water | 110 PPM Slightly HardUSGS estimate: 217 PPM | |
Macomb Township MI0003990 | surface water | 110 PPM Slightly HardUSGS estimate: 292 PPM | |
Shelby Township MI0006010 | surface water | 110 PPM Slightly HardUSGS estimate: 292 PPM |
Nearby Zip Codes
What This Means For You
Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.
Slightly Hard Water
Your water is slightly hard. You may notice minor spotting on dishes or a slight film on faucets. A water softener is optional but can improve water quality.
Recommended Products
Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | How to Test Your Water
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 Warren, MI (48091).
Frequently Asked Questions
Is the water hard in Warren, MI (48091)?
The average water hardness in 48091 is 110 PPM (6.4 GPG), which is classified as slightly hard.
Do I need a water softener in 48091?
At 110 PPM, your water is relatively soft. A water softener is generally not necessary.
Is hard water in 48091 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 48091?
Zip code 48091 in Warren, Michigan is served by 14 water systems.
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