Last updated: November 8, 2026 · Data: Citizens Water (Citizens Energy Group) water quality data via TapWaterData (CC BY 4.0)
Yes, Indianapolis has hard water. Citizens Water (Citizens Energy Group) reports total hardness of about 178 mg/L, or 10.4 grains per gallon (GPG), which is hard on the U.S. Geological Survey scale. That ranks Indianapolis #16 for hardest water among the 86 large U.S. cities in our 2026 study, and above the Indiana median of about 135 mg/L.
If you live in Indianapolis, you have probably seen the signs: white crust on faucets and shower heads, spotty dishes and soap that will not lather. This guide explains where Indianapolis’s water comes from, how hard it is compared with nearby cities and the rest of the country, and whether a water softener is worth it for your home.
Indianapolis water hardness at a glance
- Hardness: 178 mg/L (10.4 GPG)
- Category: Hard
- Water utility: Citizens Water (Citizens Energy Group)
- Data date: August 2025
- National rank: #16 hardest of 86 large U.S. cities
- Suggested softener hardness setting: about 12 GPG
Where Does Indianapolis Get Its Water?
Indianapolis water is supplied by Citizens Energy Group from a mix of surface water, including the White River, Fall Creek and Eagle Creek reservoirs, and groundwater wells. Central Indiana sits on limestone bedrock, which is why both the rivers and the wells carry high levels of calcium and magnesium.
Many Indianapolis homes see white scale on faucets and inside kettles, cloudy dishes and shorter water heater life, and well owners in surrounding counties often have even harder water.
How Hard Is Indianapolis Water Compared With Other Places?
| Place | Hardness (mg/L) | GPG |
|---|---|---|
| Indianapolis, IN | 178 | 10.4 |
| Indiana median | 135 | 7.9 |
| Median of 86 large U.S. cities | 112 | 6.5 |
| Hardest large city (Madison, WI) | 341 | 19.9 |
| Softest large city (Boston, MA) | 17 | 1.0 |
See the full rankings in our study of cities with the hardest water in the USA, or compare states on our US hard water map.
Water Hardness in Cities Near Indianapolis
| City | Hardness (mg/L) | GPG | Category | Distance |
|---|---|---|---|---|
| Beech Grove | 178 | 10.4 | Hard | 4 mi |
| Greenwood | 178 | 10.4 | Hard | 11 mi |
| New Palestine | 178 | 10.4 | Hard | 11 mi |
| Carmel | 173 | 10.1 | Hard | 14 mi |
| Avon | 178 | 10.4 | Hard | 15 mi |
| Fishers | 178 | 10.4 | Hard | 15 mi |
| Zionsville | 178 | 10.4 | Hard | 15 mi |
| Brownsburg | 181 | 10.6 | Very hard | 16 mi |
Nearby cities can have very different water because they use different utilities, wells or treatment plants.
What 10.4 GPG Hard Water Means for Your Home
- Scale: white, chalky buildup on faucets, shower heads, glass doors and inside kettles.
- Water heater: scale settles in the tank and on heating elements, lowering efficiency and shortening its life.
- Dishes and laundry: spots and film on glasses, stiff towels and faded colors.
- Skin and hair: soap scum can leave skin feeling dry and hair dull.
- Cleaning: you need more soap and detergent. See how to remove hard water stains.
Do You Need a Water Softener in Indianapolis?
At 10.4 grains per gallon, most Indianapolis homes will notice a big difference with a water softener. Here is a quick sizing example for a family of four using about 300 gallons a day:
- Daily hardness load: 300 gallons × 10.4 GPG = about 3,120 grains a day
- Weekly load: about 22,000 grains
- Suggested softener size: 24,000 to 32,000 grains
- Hardness setting: about 12 GPG (your hardness plus a small buffer)
- Sodium added: about 20 mg per 8-ounce glass of softened water
Learn more in how a water softener works, what size softener you need and water softener cost. If you would rather avoid salt, compare salt-free conditioners, which reduce scale but do not remove hardness.
Is Indianapolis Tap Water Safe to Drink?
Hard water is not a health risk, and the EPA sets no health limit for hardness. Citizens Water (Citizens Energy Group) is required to meet EPA drinking water standards and publishes an annual water quality report (Consumer Confidence Report) with its test results. If you have your own test results, compare them with EPA limits using our water test results checker.
Check the Hardness at Your Address
Hardness can vary by neighborhood. Enter your ZIP code below to see the data for your area.
Data: TapWaterData US Water Hardness Dataset (CC BY 4.0), based on utility water quality reports. ZIP locations: GeoNames (CC BY 4.0).
Frequently Asked Questions
Does Indianapolis have hard water?
Yes. Indianapolis’s water is hard, at about 178 mg/L (10.4 grains per gallon) according to Citizens Water (Citizens Energy Group).
How hard is Indianapolis water in grains per gallon?
About 10.4 grains per gallon (GPG), or 178 mg/L as calcium carbonate. Anything above 7 GPG is considered hard, and above 10.5 GPG is very hard.
What should I set my water softener to in Indianapolis?
Start with about 12 GPG, which is Indianapolis’s hardness plus a small buffer. If your home has iron in the water, add about 4 GPG for each 1 mg/L of iron. Test your softened water to confirm it reads close to zero.
Where does Indianapolis get its drinking water?
Indianapolis water is supplied by Citizens Energy Group from a mix of surface water, including the White River, Fall Creek and Eagle Creek reservoirs, and groundwater wells.
Is Indianapolis hard water bad for you?
No. Hard water is not considered a health risk. It mainly causes scale, spotty dishes, poor soap lather and dry skin, which a water softener fixes.
Sources: Citizens Water (Citizens Energy Group) annual water quality report, via TapWaterData US Water Hardness Dataset (CC BY 4.0); USGS: Hardness of Water.