Hardness
Very hard358–382ppm
Range of three reported plant levels
Marlin/Orme 376, Sugar Creek 358 and London Road 382 ppm. Full sample range: 291–431 ppm; about 17.0–25.2 gpg.
2025View source
- 1Your water
- 2Your home
- 3Your system
Johnson County, Indiana Water Quality Report
Showing utility report
Indiana American Water — Johnson County
2025 report; individual sample dates shown
For Indiana American Water’s Johnson County system (IN5241005). Separate municipal systems and private wells require their own results.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Chlorine
Below 4 ppm MRDL1.0ppm
Highest running annual average
Individual range: 0.38–1.45 ppm.
2025View source
TTHMs
Below 80 ppb MCL29.0ppb
Highest reported locational running annual average
2025View source
HAA5
Below 60 ppb MCL8.6ppb
Highest reported locational running annual average
2025View source
Fluoride
Below 4 ppm MCL0.54–0.60ppm
Range of three plant results
2024View source
Lead
Below the report’s 15 ppb action level2ppb
90th percentile at sampled taps
A utility percentile is not a test at your tap.
2024View source
Nitrate
Below 10 ppm MCL0.36ppm
Highest of three plant results
Marlin/Orme 0.36; Sugar Creek ND; London Road 0.01 ppm.
2025View source
PFOA
Below report’s 4 ppt benchmark3.4ppt
Highest reported result
Marlin/Orme result; other two plants ND. A dated report comparison, not a finding about your tap.
2025View source
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Continue with your home details for general filtration guidance. We will not use another utility’s numbers as your result.
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The figures below are provider-specific. They are not a countywide average.
| Utility | Hardness | Hardness source |
|---|---|---|
| 358–382 ppm plant levels · very hard | 2025 |
View Full Water ReportOpen the measured results, dates, comparisons and original utility report.
The numbers behind your report
Selected results with the original sampling dates and measurement basis. Open the utility report for every parameter, notice and footnote.
Open the complete utility report ↗
| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 358–382 ppmRange of three reported plant levels | 2025View source ↗ | Very hardMarlin/Orme 376, Sugar Creek 358 and London Road 382 ppm. Full sample range: 291–431 ppm; about 17.0–25.2 gpg. |
| Chlorine | 1.0 ppmHighest running annual average | 2025View source ↗ | Below 4 ppm MRDLIndividual range: 0.38–1.45 ppm. |
| TTHMs | 29.0 ppbHighest reported locational running annual average | 2025View source ↗ | Below 80 ppb MCL |
| HAA5 | 8.6 ppbHighest reported locational running annual average | 2025View source ↗ | Below 60 ppb MCL |
| Fluoride | 0.54–0.60 ppmRange of three plant results | 2024View source ↗ | Below 4 ppm MCL |
| Lead | 2 ppb90th percentile at sampled taps | 2024View source ↗ | Below the report’s 15 ppb action levelA utility percentile is not a test at your tap. |
| Nitrate | 0.36 ppmHighest of three plant results | 2025View source ↗ | Below 10 ppm MCLMarlin/Orme 0.36; Sugar Creek ND; London Road 0.01 ppm. |
| PFOA | 3.4 pptHighest reported result | 2025View source ↗ | Below report’s 4 ppt benchmarkMarlin/Orme result; other two plants ND. A dated report comparison, not a finding about your tap. |
| Copper | 0.289 ppm90th percentile at sampled taps | 2024View source ↗ | Below the report’s 1.3 ppm action levelA utility percentile is not a test at your tap. |
| PFOS | 2.1 pptHighest reported result | 2025View source ↗ | Below report’s 4 ppt benchmarkMarlin/Orme result; other two plants ND. |
| PFBS | 2.2 pptHighest reported result | 2025View source ↗ | Detection reportedNo individual maximum contaminant level is listed for PFBS in this report. |
In drinking water, ppm ≈ mg/L, ppb ≈ µg/L and ppt ≈ ng/L. Calculated hardness in grains per US gallon (gpg) = mg/L as CaCO₃ ÷ 17.118, rounded to one decimal. ND means below the reporting limit, not zero.
MCL is an enforceable contaminant limit; MRDL is a disinfectant limit. A secondary guideline concerns aesthetics. TTHM/HAA5 compliance uses locational running annual averages; read the utility’s notices as well as individual results.
PFAS results are compound-specific. Source monitoring, entry-point samples and tap tests are different. A detected result does not identify every PFAS compound or establish the level at your home. Read the original report for context and current utility notices. EPA PFAS benchmarks and implementation ↗
Turn your report into a plan for your home.
Choose the system size, keep useful existing equipment, and review your filtration goals.
Source water. The Johnson County system uses groundwater from 22 wells in six wellfields.
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More about your local water
What this means for your home
Johnson County’s listed system has three treatment-plant tables. A range of plant levels is shown instead of presenting one plant as the entire county.
The hardness sample range is useful for planning, while an incoming-water test sets the final softener configuration. Keep filtration goals separate from hardness removal.
A useful local question
Which Johnson County hardness number should I use?
The utility reports 376, 358 and 382 ppm at three plants, with a combined sample range of 291–431 ppm. Confirm which system supplies your address and test incoming water before setting a softener.
Sources and methodology
We keep each utility’s results separate, show the reported sample year, and distinguish averages, maxima and tap-sampling percentiles. Hardness classifications use USGS ranges. Missing data stays unknown.
Official utility reports
Confirm the exact system on your water bill. Choose Other / not sure when your supplier is not summarized here.
- Indiana American Water — Johnson County ↗2025 report; individual sample dates shown
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources reviewed November 12, 2026. Individual sampling dates are shown with each result.
Your water → your home → your system
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Choose the system size, keep useful existing equipment, and review your filtration goals.
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