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Hamilton County, Indiana Water Quality Report

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Carmel Utilities

2025 report; individual sample dates shown

For Carmel Utilities (IN5229004). Other Hamilton County suppliers publish separate results; confirm the system on your bill.

Your water at a glance

See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.

Hardness

Very hard

13.3gpg

2025 system-wide average; approximately 228 ppm

Range: 4–37 gpg. The separate 8 gpg treatment target is not the measured annual average.

2025View source

Chlorine

Below 4 ppm MRDL

1.01ppm

System-wide average; maximum 1.46 ppm

2025View source

TTHMs

Below 80 ppb MCL

37ppb

Highest reported locational running annual average

Highest of four site LRAAs.

2025View source

HAA5

Below 60 ppb MCL

15ppb

Highest reported locational running annual average

Highest of four site LRAAs.

2025View source

Fluoride

Below 4 ppm MCL

1.09ppm

Maximum; average 0.69 ppm

2025View source

Lead

Below the report’s 15 ppb action level

2.94ppb

90th percentile at sampled taps

A utility percentile is not a test at your tap.

2023View source

Copper

Below the report’s 1.3 ppm action level

0.144ppm

90th percentile at sampled taps

A utility percentile is not a test at your tap.

2023View source

Nitrate

Reporting limit applies

BDL

Below detectable limits

BDL is not a measured zero.

2025View source

Water hardness by provider

The figures below are provider-specific. They are not a countywide average.

UtilityHardnessHardness source
13.3 gpg average · very hard2025
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 measuredReported amountSample year / source dateHow to read it
Hardness13.3 gpg2025 system-wide average; approximately 228 ppm2025View source ↗Very hardRange: 4–37 gpg. The separate 8 gpg treatment target is not the measured annual average.
Chlorine1.01 ppmSystem-wide average; maximum 1.46 ppm2025View source ↗Below 4 ppm MRDL
TTHMs37 ppbHighest reported locational running annual average2025View source ↗Below 80 ppb MCLHighest of four site LRAAs.
HAA515 ppbHighest reported locational running annual average2025View source ↗Below 60 ppb MCLHighest of four site LRAAs.
Fluoride1.09 ppmMaximum; average 0.69 ppm2025View source ↗Below 4 ppm MCL
Lead2.94 ppb90th percentile at sampled taps2023View source ↗Below the report’s 15 ppb action levelA utility percentile is not a test at your tap.
Copper0.144 ppm90th percentile at sampled taps2023View source ↗Below the report’s 1.3 ppm action levelA utility percentile is not a test at your tap.
NitrateBDL Below detectable limits2025View source ↗Reporting limit appliesBDL is not a measured zero.

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 ↗

Hardness source ↗USGS hardness classification ↗

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Source water. Groundwater is filtered for iron, softened, disinfected and fluoridated before distribution.

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More about your local water

What this means for your home

Hamilton County includes several utilities. A Carmel result should not be transferred to a Westfield, Noblesville or other service address without confirming the actual supplier.

The 2025 report describes an 8 gpg treatment target, but its results table lists a 13.3 gpg annual average and a 4–37 gpg range. The report also says softening can decrease during high summer demand. We use the measured table and keep the target separate.

Filter vs. softener: what each doesPlan installation with your plumber

A useful local question

Is Carmel’s water hardness 8 or 13.3 grains per gallon?

The 2025 report describes an 8 gpg treatment target, but its results table lists a 13.3 gpg annual average and a 4–37 gpg range. The report also says softening can decrease during high summer demand. We use the measured table and keep the target separate.

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.

Sources reviewed November 10, 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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