Water Hardness in 48105
Ann Arbor, Michigan · Washtenaw County
Dataset updated March 9, 2026Matched to 8 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 8 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 48105
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 |
|---|---|---|---|
Ann Arbor MI0000220 | surface water | 129 PPM Moderately HardUSGS estimate: 261 PPM | |
Ypsilanti Community Utility Authority MI0007260 | surface water | 270 PPM Very Hard | |
Pittsfield Township MI0005360 | surface water | 261 PPM Very Hard | |
Scio Township MI0005977 | surface water | 261 PPM Very Hard | |
Loch Alpine Sanitary Authority MI0003940 | groundwater | 346 PPM Very Hard |
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.
Moderately Hard Water
Your water is moderately hard. You're likely seeing scale buildup on fixtures, spotty dishes, and may notice dry skin or hair. A water softener or conditioner can help.
Recommended Products
Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | 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 Ann Arbor, MI (48105).
Frequently Asked Questions
Is the water hard in Ann Arbor, MI (48105)?
The average water hardness in 48105 is 167 PPM (9.8 GPG), which is classified as moderately hard.
Do I need a water softener in 48105?
With hardness of 167 PPM, a water softener is worth considering for homes in 48105.
Is hard water in 48105 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 48105?
Zip code 48105 in Ann Arbor, Michigan is served by 8 water systems.
Learn More About Your Water
Do You Need a Water Softener? (Based on Your Water Hardness)
A data-driven guide to help you decide if a water softener is worth the investment based on your actual water hardness level.
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Salt-based softeners remove hardness minerals. Salt-free conditioners prevent scale but don't soften. Here's how to choose based on your water hardness level.
10 min readBest Shower Filters for Hard Water (2026 Reviews)
We tested KDF, Vitamin C, and carbon shower filters for hard water. Here are the filters that actually reduce mineral buildup on hair and skin.
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