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Vigo County, Indiana Water Quality Report

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Indiana American Water — Terre Haute

2025 report; individual sample dates shown

For Indiana American Water’s Terre Haute system (IN5284012). These utility results do not establish water quality for every Vigo County address.

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

330ppm

Reported level; approximately 19.3 gpg

Sample range: 280–400 ppm.

2025View source

Chloramines

Below 4 ppm MRDL

1.71ppm

Highest running annual average

Individual range: 0.5–3.2 ppm.

2025View source

TTHMs

Below 80 ppb MCL

23.4ppb

Highest reported locational running annual average

2025View source

HAA5

Below 60 ppb MCL

16.0ppb

Highest reported locational running annual average

2025View source

Fluoride

Below 4 ppm MCL

0.14ppm

Reported plant result

2023View source

Lead

Below the report’s 15 ppb action level

2ppb

90th percentile at sampled taps

1 of 30 sampled sites exceeded the report’s action level; highest sample 33 ppb.

2025View source

Copper

Below the report’s 1.3 ppm action level

0.664ppm

90th percentile at sampled taps

2 of 30 sampled sites exceeded the report’s action level; highest sample 1.641 ppm.

2025View source

Nitrate

Below 10 ppm MCL

3.66ppm

Reported plant result

2025View source

Water hardness by provider

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

UtilityHardnessHardness source
330 ppm reported level · 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
Hardness330 ppmReported level; approximately 19.3 gpg2025View source ↗Very hardSample range: 280–400 ppm.
Chloramines1.71 ppmHighest running annual average2025View source ↗Below 4 ppm MRDLIndividual range: 0.5–3.2 ppm.
TTHMs23.4 ppbHighest reported locational running annual average2025View source ↗Below 80 ppb MCL
HAA516.0 ppbHighest reported locational running annual average2025View source ↗Below 60 ppb MCL
Fluoride0.14 ppmReported plant result2023View source ↗Below 4 ppm MCL
Lead2 ppb90th percentile at sampled taps2025View source ↗Below the report’s 15 ppb action level1 of 30 sampled sites exceeded the report’s action level; highest sample 33 ppb.
Copper0.664 ppm90th percentile at sampled taps2025View source ↗Below the report’s 1.3 ppm action level2 of 30 sampled sites exceeded the report’s action level; highest sample 1.641 ppm.
Nitrate3.66 ppmReported plant result2025View source ↗Below 10 ppm MCL
PFBS3.6 pptHighest reported result2025View source ↗Detection reportedThe report does not list an individual PFBS maximum contaminant level.

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. Terre Haute uses groundwater from three vertical wells and a horizontal radial collector well beside the Wabash River.

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More about your local water

What this means for your home

Terre Haute’s wells are beside the Wabash River, but the report identifies the supply as groundwater. The listed plant and distribution results belong to that utility system.

Lead and copper percentiles were below the report’s action levels while some individual homes were above them. Include the service line and household plumbing in any address-specific assessment.

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

A useful local question

Does a water softener address Terre Haute’s chloramines?

A softener is intended for hardness minerals and scale. Choose the filter separately for documented chloramine reduction, then use incoming hardness and household flow to size the installation.

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 12, 2026. Individual sampling dates are shown with each result.

Your water → your home → your system

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