Water Hardness Map

How to use the interactive water hardness map: 1) Click on a State to zoom-in. 2) Click on a City to open a pop-up box detailing its water hardness. 3) Click on an area without a City to open a pop-up box detailing the average State water hardness. 4) Click the arrow that is located at the top left corner of the map to zoom-out.


State Capital  - State Capital

City  - City

Interactive US Water Hardness Map

Hard water is an issue throughout the United States; as much as 85 percent of the nation's households have a hard water level ranging from slightly to extremely hard. 


Do I live in a hard water area?

We often hear customers ask "what is the water hardness in my area?" Determining water hardness in your area can be a daunting task. We have created the above USA water hardness map to help inform consumers. This tool should give you a starting point in finding solutions to your water concerns. So what is my water hardness?  Each state has a water hardness chart that can assist in finding your cities specific water hardness measurement.  For water hardness info by zip code, please contact your local water authority.


Alabama - AL

Alaska - AK

Arizona - AZ

Arkansas - AR

California - CA

Colorado - CO

Connecticut - CT

Delaware - DE

Florida - FL

Georgia - GA

Hawaii - HI

Idaho - ID

Illinois - IL

Indiana - IN

Iowa - IA

Kansas - KS

Kentucky - KY

Louisiana - LA


Maine - ME

Maryland - MD

Massachusetts - MA

Michigan - MI

Minnesota - MN

Mississippi - MS

Missouri - MO

Montana - MT

Nebraska - NE

Nevada - NV

New Hampshire - NH

New Jersey - NJ

New Mexico - NM

New York - NY

North Carolina - NC

North Dakota - ND

Ohio - OH

Oklahoma - OK


Oregon - OR

Pennsylvania - PA

Rhode Island - RI

South Carolina - SC

South Dakota - SD

Tennessee - TN

Texas - TX

Utah - UT

Vermont - VT

Virginia - VA

Washington - WA

West Virginia - WV

Wisconsin - WI

Wyoming - WY










What is Water Hardness?

When it rains, the water that hits the ground does not contain any minerals, but it does have varying levels of acidic atmospheric pollution. As the acidic water comes in contact with different rock formations, it begins to slowly dissolve minerals such as Calcium Carbonate, which is found in limestone. As the mineral content in the water increases, the water is considered “harder”.


The longer water is exposed to a certain stone, the harder it will be. For example, water from an underground aquifer will be harder than water from a river or lake. Water hardness levels are depicted in milligrams per liter (mg/L), parts per million (PPM) or grains per gallon (gpg). This map uses PPM  measures. To convert grains per gallon to ppm click here.


Hard water is healthy to Carbon based lifeforms because it contains essential minerals, with this said, it is detrimental to pipes and equipment due to its tendency to accumulate as hard scale. There are different ways to reduce scale accumulation, but before selecting the method that best fits your needs, it’s important to know if you live in a hard water area.


The Cost of Hard Water

Hard water causes scale to accumulate in pipe systems and equipment. This water hardness, scale build-up comes at a significant cost.



Eco-Friendly Solution for Water Hardness Problems

HydroFLOW has a full range of award-winning water conditioners that provide a chemical-free and eco-friendly solution for the harmful effects of scale.


Residential Grade Products - These affordable water conditioners are very simple to install and can be used for on-demand or conventional water heaters, RVs, homes, commercial kitchens, steam room, pools and spas.


Commercial and Industrial Grade Products - These durable water conditioners are fully encapsulated and water-resistant. Designed for ease of installation, the units are simply built around the pipe and connected via the power supply unit. These industrial-grade products can be custom-made to fit pipes up to 86 inches in diameter.




The data in this map comes to provide a general outline of water hardness throughout the USA. Water hardness figures are based on reports from government and private sources. We do not guarantee the water hardness figures are 100% accurate. The average water hardness in each State is based on the specified cities in that State. Private wells (over 13 million households) were not considered, due to insufficient online data. Please contact us if you find any inaccuracies or you would like your city to be included to the map. The contaminants described in the state pages are based on reports from Government and private sources; we do not guarantee the figures are 100% accurate.



Environmental Protection Agency (EPA)

United States Geological Survey (USGS)

American Water Works Association (AWWA)

Center for Disease Control and Prevention (CDC)

Agricultural Research Service (ARS)

National Science Foundation (NSF)

Various of Municipal Water Quality Reports

Various of State Departments of Ecology

Various City, State and County Utility Departments

Various Water Management Information Systems