State distribution
Hardness across indexed ZIPs
Counts describe published ZIP profiles, not a population-weighted statewide sample.
Soft · 0–60 PPM0
Moderately hard · 61–120 PPM8
Hard · 121–180 PPM27
Very hard · 181+ PPM255
State water index
Indiana water hardness
Search 386 indexed communities and 472 ZIP profiles, then compare the underlying utility, source, distance, and reporting context.
Median regional evidence
340PPM
Very Hard
Indexed range 78.6–498 PPM
- ZIP profiles
- 472
- Cities
- 386
- Matched utilities
- 647
- Counties
- 92
Understanding Indiana
Why local comparisons matter here
Indiana communities use Lake Michigan, rivers and reservoirs, glacial aquifers, and bedrock groundwater. Northern and southern source settings can be quite different.
In this index, very hard is the largest category, covering 255 of 290 profiles with hardness data. The state median is 340 PPM, but the full indexed range is 78.6–498 PPM.
Evidence coverage
What the current records support
- Hardness estimate
- 61%
- Lead 90th percentile
- 100%
- Copper 90th percentile
- 19%
115
Low-confidence hardness profiles
83
Research-comparison eligible profiles
Reported source water
Utility source mix
- Groundwater
- 549
- Surface water
- 93
- Groundwater influenced by surface water
- 5
Highest medians
Highest eligible city medians
- 1. Anderson387 PPM
- 2. Carmel340 PPM
Lowest medians
Lowest eligible city medians
- 1. Carmel340 PPM
- 2. Anderson387 PPM
City directory
Explore Indiana by city
Search by city or county, then sort by name, hardness, or ZIP coverage.
386 cities · 472 ZIP profiles
386 cities found
Page 1 of 17
Advance
Boone County · 1 ZIP
349PPM regional
Single regional valueNo active flag
Akron
Fulton County · 1 ZIP
—
No regional sampleNo active flag
Albany
Delaware County · 1 ZIP
332PPM regional
Single regional valueNo active flag
Albion
Noble County · 1 ZIP
—
No regional sampleNo active flag
Alexandria
Madison County · 1 ZIP
387PPM regional
Single regional valueNo active flag
Anderson
Madison County · 4 ZIPs
387PPM regional
Single regional valueNo active flag
Andrews
Huntington County · 1 ZIP
—
No regional sampleNo active flag
Angola
Steuben County · 1 ZIP
304PPM regional
Single regional valueNo active flag
Arcadia
Hamilton County · 1 ZIP
355PPM regional
Single regional valueNo active flag
Argos
Marshall County · 1 ZIP
—
No regional sampleNo active flag
Atlanta
Hamilton County · 1 ZIP
355PPM regional
Single regional valueNo active flag
Attica
Fountain County · 1 ZIP
—
No regional sampleNo active flag
Auburn
Dekalb County · 1 ZIP
376PPM regional
Single regional valueNo active flag
Aurora
Dearborn County · 1 ZIP
319PPM regional
Single regional valueNo active flag
Austin
Scott County · 1 ZIP
—
No regional sampleNo active flag
Avilla
Noble County · 1 ZIP
—
No regional sampleNo active flag
Bainbridge
Putnam County · 1 ZIP
350PPM regional
Single regional valueNo active flag
Bargersville
Johnson County · 1 ZIP
376PPM regional
Single regional valueNo active flag
Batesville
Ripley County · 1 ZIP
—
No regional sampleNo active flag
Battle Ground
Tippecanoe County · 1 ZIP
—
No regional sample1 active record
Bedford
Lawrence County · 1 ZIP
—
No regional sampleNo active flag
Berne
Adams County · 1 ZIP
—
No regional sampleNo active flag
Birdseye
Dubois County · 1 ZIP
—
No regional sampleNo active flag
Bloomingdale
Parke County · 1 ZIP
350PPM regional
Single regional value1 active record
County comparison
Highest regional-evidence county medians
| County | Median | Range | ZIP profiles |
|---|---|---|---|
| Owen County | 479 PPM | 459–498 | 2 |
| Blackford County | 412 PPM | 412–412 | 1 |
| Morgan County | 395 PPM | 369.5–459 | 4 |
| Brown County | 390 PPM | 390–390 | 2 |
| Madison County | 387 PPM | 345.5–394 | 13 |
| Grant County | 387 PPM | 349–399.5 | 5 |
| Wabash County | 387 PPM | 387–387 | 6 |
| Switzerland County | 386 PPM | 377.5–394.5 | 2 |
| Jackson County | 363 PPM | 338.5–371 | 4 |
| Henry County | 362 PPM | 349–364 | 7 |
| Elkhart County | 360 PPM | 359.5–359.5 | 10 |
| St. Joseph County | 360 PPM | 309.5–380 | 17 |