What Is Hard Water and What Impact Does It Have on Homes and Families?
Hard water is water containing dissolved calcium and magnesium minerals. It is measured in grains per gallon (gpg). About 85 percent of US homes have hard water, but only 30 percent use a water softener.
Water Hardness Scale
Water hardness categories measured in grains per gallon (gpg)
Category
Range (gpg)
Color on map
Soft
0 to 3.5 gpg
#FCFCFC (near white)
Slightly Hard
3.5 to 7 gpg
#C5EAFC (light blue)
Hard
7 to 10.5 gpg
#8BCEE9 (medium blue)
Very Hard
10.5 to 15 gpg
#12B1E8 (bright blue)
Extremely Hard
15+ gpg
#016191 (dark blue)
Signs You May Have Hard Water
Dry, itchy skin and scalp — mineral deposits clog pores and strip natural oils
Greasy, brittle hair — calcium buildup makes hair waxy, dull, and prone to breakage
Spotted dishes and glassware — white mineral spots appear after washing
Poor soap lather — hard water forms scum instead of lather
Scratchy linens and towels — mineral buildup makes fabric stiff and rough
Scale buildup on fixtures — white chalky deposits form around faucets and showerheads
Decreased water pressure — scale narrows pipes over time
Frequent appliance breakdowns — water heaters, dishwashers, and washing machines wear out faster
United States Water Hardness Map
The US water hardness map shows varying hardness levels across the country. With the exception of the Pacific Northwest, parts of the South, and the Northeast, most of the continental United States has hard water. Ancient seabeds left high concentrations of limestone across the hardest regions.
American Cities With Hard Water
Austin, TX
Chicago, IL
Indianapolis, IN
Jacksonville, FL
Kansas City, MO
Las Vegas, NV
Minneapolis, MN
Phoenix, AZ
Salt Lake City, UT
San Antonio, TX
San Jose, CA
Tampa, FL
Key Statistics
85% of US homes experience hard water
30% of people with hard water use a water softener
Ancient seabeds once covered much of the US, leaving high concentrations of limestone
How to Fix Hard Water Problems
Water softeners are the simplest, most economical solution. EcoPure water softeners are designed, manufactured, and assembled in the United States. They are backed by 100 years of innovation, a comprehensive warranty, and third-party certifications. Demand-initiated systems save energy, water, and salt. A water softener is designed to last 10 or more years.
NSF Certified
Made in USA
10+ Year Lifespan
100-Year Heritage
EcoPure Water Softener Products
Water Softener EPS110 — for 1 to 2 person households. Simple, reliable hard water reduction. URL: https://ecopure.com/product/water-softener-for-1-2-person-households-eps110/
Water Softener EPS120 — for 3 to 4 person households. Consistent soft water for everyday bathing, laundry, and cleaning. URL: https://ecopure.com/product/water-softener-for-3-4-person-households-eps120/
2-in-1 Softener and Filtration System EPH130 — for up to 5 person households. Softens and filters water throughout your entire home. URL: https://ecopure.com/product/2-in-1-softener-filtration-system-for-up-to-5-person-households-eph130/
Wi-Fi Water Softener EPW140 — for up to 6 person households. Powerful softening with smart monitoring and alerts. URL: https://ecopure.com/product/wi-fi-water-softener-for-up-to-6-person-households-epw140/
Related Resources
How to Test for Hard Water at Home — https://ecopure.com/learning-center/test-for-hard-water-at-home/
How a Water Softener Works — https://ecopure.com/learning-center/how-a-water-softener-works/
How to Reduce PFAS in Drinking Water — https://ecopure.com/learning-center/how-to-remove-pfas-from-drinking-water/
Get a Free Hard Water Test Strip — https://ecopure.com/learning-center/get-a-free-test-strip/
💧 Learning Center
What Is Hard Water and What Impact Does It Have?
A look at hard water across the United States — caused by dissolved calcium and magnesium, hard water minerals are more abundant in some geographic areas than others.
The effects often accumulate slowly — here’s what to look for in your home.
🧴
Dry, itchy skin & scalp
Mineral deposits clog pores and strip natural oils, leaving skin feeling tight and irritated.
💇
Greasy, brittle hair
Calcium builds up on hair strands, making them feel waxy, dull, and prone to breakage.
🍽️
Spotted dishes & glassware
White mineral spots appear on dishes and glasses after washing — even with dishwashers.
🫧
Poor soap lather
Hard water reacts with soap to form scum instead of lather, using more product to clean.
🛁
Scratchy linens & towels
Mineral buildup in fabric makes towels, sheets, and clothing feel stiff and rough over time.
🚿
Scale buildup on fixtures
White, chalky deposits form around faucets, showerheads, and tile grout lines.
💧
Decreased water pressure
Scale accumulates inside pipes over time, narrowing the diameter and restricting flow.
🔧
Frequent appliance breakdowns
Water heaters, dishwashers, and washing machines wear out faster due to mineral scale buildup.
United States Water Hardness Map
Water hardness categories by grains per gallon (gpg)
Category
Hardness Range
Soft
0–3.5 gpg
Slightly Hard
3.5–7 gpg
Hard
7–10.5 gpg
Very Hard
10.5–15 gpg
Extremely Hard
15+ gpg
Soft (0–3.5 gpg)
Slightly hard (3.5–7 gpg)
Hard (7–10.5 gpg)
Very hard (10.5–14 gpg)
Extremely hard (15+ gpg)
With the exception of the Pacific Northwest, parts of the South, and the Northeast, most of the continental United States has hard water.
American Cities With Hard Water
Austin, TX
Chicago, IL
Indianapolis, IN
Jacksonville, FL
Kansas City, MO
Las Vegas, NV
Minneapolis, MN
Phoenix, AZ
Salt Lake City, UT
San Antonio, TX
San Jose, CA
Tampa, FL
🪨
Did You Know?
Ancient seabeds once covered much of the United States, leaving high concentrations of limestone in the hard-to-extremely-hard water regions we see today.
85%
of people have hard water
30%
use a water softener
The Solution
How to Fix Hard Water Problems
Water softeners are the simplest, most economical way to get soft water for your family. EcoPure water softeners are designed to last 10 or more years and protect your home, appliances, and wellbeing — here’s what sets EcoPure apart:
Made in the USA
Designed, manufactured, and assembled in the United States.
🏅
100 Years of Innovation
Backed by a century of EcoPure expertise and a comprehensive warranty.
✅
Third-Party Certified
NSF certified to ensure materials are safe and won’t introduce contaminants into your water.
💧
Demand-Initiated Technology
Monitors your actual usage to save energy, water, and salt.