Is Terre Haute, IN Tap Water Safe to Drink?
Terre Haute tap water is legally compliant, but one contaminant exceeds health guidelines. Specifically: PFAS above EPA limits (PFOS: 5.2 ppt — limit is 4 ppt each). A point-of-use filter is recommended for drinking and cooking water. Terre Haute also has very hard water at 240 PPM.
Hardness Scale: Where Terre Haute Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Terre Haute Compares
Terre Haute's water is 74% harder than the national average of 138 PPM. It ranks #212 out of 1000 cities in our database (harder than 79% of US cities we track). Within Indiana, it ranks #12 of 17 cities (0% below the state average of 241 PPM). Among cities (50k-100k), Terre Haute ranks #70 of 258 for hardness. At this hardness level, water heaters run an estimated 44% less efficiently due to scale insulation, and major water-using appliances typically last 3 years less than the national average lifespan.
What Terre Haute's Water Means for Your Home
Hardness: 240 PPM - Treatment Recommended
Terre Haute has some seriously hard water. At 240 PPM (14 grains per gallon), your tap is loaded with dissolved calcium and magnesium picked up from underground limestone and dolomite formations. Here's the thing: it's perfectly safe to drink. The minerals won't hurt you. But they will hurt your wallet. That adds up. Hard water at 240 PPM increases household costs through scale-coated water heaters that use more energy, extra soap and detergent, and appliances that wear out faster. Most Terre Haute homeowners don't realize it until the plumber shows up.
Contaminants & Safety
Forever chemicals (PFAS) are worth watching here. Terre Haute has PFOS at 5.2 ppt, exceeding the EPA's 2024 limit of 4 ppt per compound. PFAS are synthetic compounds that accumulate in your body over time. A certified carbon filter or reverse osmosis system with NSF P473 certification is the most effective protection. See the regulatory timeline.
What's in the Treatment Process
Even though Terre Haute draws from groundwater, the treatment process still generates disinfection byproducts: TTHMs at 22.9 ppb and HAA5 at 16.3 ppb. Groundwater typically needs less treatment than surface water, but when organic compounds are present in the aquifer, chlorination creates the same byproducts. All levels are within legal limits, though above the stricter EWG health guidelines. All measurements are within federal legal limits. The EWG guidelines represent a more conservative, health-based standard.
How Hard Water Affects Your Home
At 240 PPM, untreated hard water has measurable effects on household costs and appliance life:
- Water heater inefficiency: Scale insulation forces the heater to work harder (DOE estimates up to 22% more energy for heavily scaled units)
- Soap and detergent: Hard water reduces lathering, requiring significantly more product
- Appliance replacement: Water heaters, dishwashers, and washing machines fail 2-4 years earlier due to scale buildup
- Plumbing maintenance: Scale buildup in pipes reduces flow and requires more frequent service
Note: Impact varies by household size, water usage, and local energy costs. A home water test provides the most accurate assessment for your specific situation.
| Contaminant | Detected | Health Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Hardness (as CaCO₃) | 240 PPM | < 60 PPM | No federal limit | ⚠ Very Hard |
| Total Dissolved Solids | 333 PPM | < 300 PPM | 500 PPM | ⚠ Elevated |
| PFAS (total) | 12.3 ppt | — | No total limit | Detected |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 5.2 ppt | 0 ppt | 4 ppt (2024) | ⚠ Exceeds |
| Lead | 2 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 1.5 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 3.19 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommendations for Terre Haute Homes
Our Top Picks for Terre Haute (240 PPM)
Hard water at 240 PPM causes scale buildup, increased energy use, and premature appliance failure. A softener protects your plumbing and appliances.
Recommended Filter for Terre Haute
PFAS exceed EPA limits (PFOS: 5.2 ppt — limit: 4 ppt each). A certified filter reduces these contaminants effectively.
Quick Fix for Chlorine: Shower Filter
At 1.5 mg/L chlorine, many Terre Haute residents notice dry skin, brittle hair, and that "pool smell" in the shower. A shower filter installs in 5 minutes, no tools needed.
How to Test Your Water in Terre Haute
With PFAS at 12.3 ppt in Terre Haute's supply, confirming your home's specific levels is especially important. PFAS vary by neighborhood and can concentrate differently depending on your position in the distribution system.
Free option: Request Indiana American Water's annual Consumer Confidence Report for official city-level data.
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About Terre Haute's Water Supply
Water Utility: Indiana American Water
Water Source: Wabash River alluvial wells (Groundwater)
Population Served: 67,765
Hardness: 240 PPM (14 grains per gallon)
Terre Haute draws its drinking water from groundwater sources — Wabash River alluvial wells. Groundwater typically requires less treatment than surface water because the earth acts as a natural filter. The tradeoff: dissolved minerals from underground rock formations, which is why hardness is elevated here. Calcium and magnesium dissolve into the water as it moves through limestone and dolomite. The system serves 68,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request Indiana American Water's Consumer Confidence Report (CCR) or test your own tap.
ZIP Codes Covered by This Report
This water quality data applies to all areas served by Indiana American Water in Terre Haute, IN, including ZIP codes:
46135, 46170, 46171, 46175, 47427, 47438, 47441, 47445, 47455, 47512, 47516, 47535, 47561, 47573, 47596, 47801, 47802, 47803, 47804, 47805, 47807, 47808, 47809, 47830, 47831, 47832, 47833, 47834, 47836, 47837, 47838, 47840, 47841, 47842, 47845, 47846, 47847, 47848, 47849, 47850, 47851, 47852, 47853, 47854, 47855, 47857, 47858, 47859, 47860, 47861, 47862, 47863, 47865, 47866, 47868, 47869, 47870, 47871, 47872, 47874, 47875, 47876, 47878, 47879, 47880, 47881, 47882, 47884, 47885, 47928, 47966, 47989, 61912, 61917, 61920, 61924, 61933, 61944, 61949, 61955, 62413, 62420, 62423, 62424, 62425, 62427, 62428, 62432, 62433, 62434, 62435, 62436, 62440, 62441, 62442, 62445, 62448, 62449, 62451, 62454, 62459, 62464, 62468, 62474, 62475, 62477, 62478, 62479, 62480, 62481
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Water Softener Sizing for Terre Haute
At 240 PPM (14 GPG), here is how to size a softener for your Terre Haute home. Multiply hardness in GPG (14) by daily water usage (roughly 50 gallons per person). A family of four uses about 200 gallons/day: 14 GPG × 200 gal = 2800 grains/day. Over a 7-day regeneration cycle, that is 19,600 grains - a 32,000-grain softener is the right fit for most Terre Haute households.
Compare Terre Haute to Other Indiana Cities
Frequently Asked Questions About Terre Haute Water
Is Terre Haute tap water safe to drink?
Where does Terre Haute's water come from?
Do I need a water softener in Terre Haute?
How do I remove PFAS from Terre Haute tap water?
What water filter is best for Terre Haute?
Is Terre Haute water safe for babies and infants?
Does Terre Haute water damage tankless water heaters?
Do I need both a softener AND a filter in Terre Haute?
Data sources: Lead and copper data from EPA Safe Drinking Water Act LCR reporting. Contaminant data from utility-reported testing results. PFAS data from EPA UCMR5 (2023–2025). Hardness from USGS and municipal reports. Data reflects system-level testing results and may not match your specific tap due to neighborhood plumbing, season, or recent utility changes. For your utility's latest results, request their Consumer Confidence Report (CCR). Our methodology. Last updated: 2026-02-24.
What Terre Haute Homeowners Actually Buy
Prioritized for contaminant reduction for homes with 240 PPM water and PFAS above EPA limits.
Affiliate disclosure: we may earn a commission. Selection based on Terre Haute's water data.