State distribution
Hardness across indexed ZIPs
Counts describe published ZIP profiles, not a population-weighted statewide sample.
Soft · 0–60 PPM1
Moderately hard · 61–120 PPM4
Hard · 121–180 PPM16
Very hard · 181+ PPM259
State water index
Michigan water hardness
Search 382 indexed communities and 512 ZIP profiles, then compare the underlying utility, source, distance, and reporting context.
Median regional evidence
283PPM
Very Hard
Indexed range 51.6–479 PPM
- ZIP profiles
- 512
- Cities
- 382
- Matched utilities
- 430
- Counties
- 82
Understanding Michigan
Why local comparisons matter here
Michigan is surrounded by the Great Lakes but also contains extensive glacial and bedrock groundwater systems, with distinct settings across both peninsulas.
In this index, very hard is the largest category, covering 259 of 280 profiles with hardness data. The state median is 283 PPM, but the full indexed range is 51.6–479 PPM.
Evidence coverage
What the current records support
- Hardness estimate
- 55%
- Lead 90th percentile
- 95%
- Copper 90th percentile
- 13%
187
Low-confidence hardness profiles
39
Research-comparison eligible profiles
Reported source water
Utility source mix
- Groundwater
- 283
- Surface water
- 145
- Groundwater influenced by surface water
- 2
Highest medians
Highest eligible city medians
- 1. Lansing418 PPM
Lowest medians
Lowest eligible city medians
- 1. Lansing418 PPM
City directory
Explore Michigan by city
Search by city or county, then sort by name, hardness, or ZIP coverage.
382 cities · 512 ZIP profiles
382 cities found
Page 1 of 16
Addison
Lenawee County · 1 ZIP
320PPM regional
Single regional valueNo active flag
Adrian
Lenawee County · 1 ZIP
—
No regional sampleNo active flag
Ahmeek
Keweenaw County · 1 ZIP
—
No regional sampleNo active flag
Albion
Calhoun County · 1 ZIP
346PPM regional
Single regional value1 active record
Allegan
Allegan County · 1 ZIP
359PPM regional
Single regional valueNo active flag
Allen Park
Wayne County · 1 ZIP
—
No regional sampleNo active flag
Allendale
Ottawa County · 1 ZIP
—
No regional sampleNo active flag
Alma
Gratiot County · 1 ZIP
—
No regional sampleNo active flag
Almont
Lapeer County · 1 ZIP
283PPM regional
Single regional valueNo active flag
Alpena
Alpena County · 1 ZIP
—
No regional sampleNo active flag
Alpha
Iron County · 1 ZIP
151PPM regional
Single regional valueNo active flag
Amasa
Iron County · 1 ZIP
151PPM regional
Single regional valueNo active flag
Ann Arbor
Washtenaw County · 5 ZIPs
—
No regional sampleNo active flag
Armada
Macomb County · 1 ZIP
278PPM regional
Single regional valueNo active flag
Ashley
Gratiot County · 1 ZIP
—
No regional sampleNo active flag
Atlanta
Montmorency County · 1 ZIP
—
No regional sampleNo active flag
Au Gres
Arenac County · 1 ZIP
—
No regional sampleNo active flag
Auburn
Bay County · 1 ZIP
—
No regional sampleNo active flag
Auburn Hills
Oakland County · 2 ZIPs
283PPM regional
Single regional valueNo active flag
Augusta
Kalamazoo County · 1 ZIP
359PPM regional
Single regional valueNo active flag
Bad Axe
Huron County · 1 ZIP
—
No regional sampleNo active flag
Baldwin
Lake County · 1 ZIP
—
No regional sampleNo active flag
Bancroft
Shiawassee County · 1 ZIP
402PPM regional
Single regional valueNo active flag
Bangor
Van Buren County · 1 ZIP
260PPM regional
Single regional valueNo active flag
County comparison
Highest regional-evidence county medians
| County | Median | Range | ZIP profiles |
|---|---|---|---|
| Barry County | 445 PPM | 359–445 | 5 |
| Ionia County | 440 PPM | 435–445 | 8 |
| Clinton County | 439 PPM | 416–479 | 7 |
| Eaton County | 418 PPM | 410–445 | 7 |
| Ingham County | 418 PPM | 398–417.5 | 13 |
| Livingston County | 407 PPM | 388.5–412 | 6 |
| Shiawassee County | 402 PPM | 373–410 | 7 |
| Washtenaw County | 375 PPM | 361–402.5 | 12 |
| Monroe County | 367 PPM | 366.5–366.5 | 7 |
| Kalamazoo County | 359 PPM | 359–359 | 14 |
| Allegan County | 359 PPM | 359–359 | 7 |
| Calhoun County | 359 PPM | 310–445 | 8 |