Water Hardness by Zip Code of United States of America

Water quality is a critical aspect of our daily lives, and one factor that significantly affects it is water hardness. If you’ve ever wondered about the hardness of your water, you’re in the right place. In this comprehensive guide, we will delve deep into the concept of water hardness, how it varies by location, and how you can determine the water hardness level by zip code.

What is Water Hardness?

Water hardness is a measure of the concentration of dissolved minerals, primarily calcium and magnesium, in your water supply. These minerals are naturally picked up as water passes through rocks and soil. The higher the concentration of these minerals, the harder the water. Conversely, lower concentrations result in softer water.

StateZIP CodeHardness PPMHardness GPGHardness Results
Alabama3520186 PPM5 GPGModerately Hard
Alaska9950163 PPM3.7 GPGModerately Hard
Arizona85001230 PPM13.5 GPGVery Hard
Arkansas7220126 PPM1.5 GPGSlightly Soft
California90001172 PPM10.1 GPGVery Hard
Colorado80201126 PPM7.4 GPGHard
Connecticut06101153 PPM8.9 GPGHard
Delaware19801122 PPM7.1 GPGHard
Florida33101219 PPM12.8 GPGVery Hard
Georgia3030121 PPM1.2 GPGSlightly Soft
Hawaii9680134 PPM2 GPGSlightly Soft
Idaho8370194 PPM5.5 GPGModerately Hard
Illinois60601148 PPM8.7 GPGHard
Indiana46201274 PPM16 GPGVery Hard
Iowa50301154 PPM9 GPGHard
Kansas66101186 PPM10.9 GPGVery Hard
Kentucky40201159 PPM9.3 GPGHard
Louisiana70112138 PPM8.1 GPGHard
Maine0410110 PPM0.6 GPGSoft
Maryland2140170 PPM4.1 GPGModerately Hard
Massachusetts0210170 PPM4.1 GPGModerately Hard
Michigan48201104 PPM6.1 GPGModerately Hard
Minnesota55101175 PPM10.2 GPGVery Hard
Mississippi39201164 PPM9.6 GPGHard
Missouri63101152 PPM8.9 GPGHard
Montana5960125 PPM1.5 GPGSlightly Soft
Nebraska68501236 PPM13.8 GPGVery Hard
Nevada89101292 PPM17.1 GPGVery Hard
New Hampshire0330137 PPM2.2 GPGSlightly Soft
New Jersey0710151 PPM3 GPGSlightly Soft
New Mexico87501150 PPM8.8 GPGHard
New York1000127 PPM1.6 GPGSlightly Soft
North Carolina2760140 PPM2.3 GPGSlightly Soft
North Dakota58501123 PPM7.2 GPGHard
Ohio4320147 PPM2.7 GPGSlightly Soft
Oklahoma73101154 PPM9 GPGHard
Oregon9720122 PPM1.3 GPGSlightly Soft
Pennsylvania19101149 PPM8.7 GPGHard
Rhode Island0290138 PPM2.2 GPGSlightly Soft
South Carolina29201174 PPM10.2 GPGVery Hard
South Dakota57501180 PPM10.5 GPGVery Hard
Tennessee3720190 PPM5.3 GPGModerately Hard
Texas73301137 PPM8 GPGHard
Utah84101327 PPM19.1 GPGVery Hard
Vermont0540169 PPM4 GPGModerately Hard
Virginia2321864 PPM3.7 GPGModerately Hard
Washington9850155 PPM3.2 GPGSlightly Soft
West Virginia2530162 PPM3.6 GPGModerately Hard
Wisconsin53701350 PPM20.5 GPGVery Hard
Wyoming82001110 PPM6.4 GPGModerately Hard

The Impact of Water Hardness

Water hardness is more than just a scientific measurement; it has a tangible impact on your daily life. Let’s explore how it affects different aspects:

Household Appliances

Hard water can wreak havoc on household appliances. The minerals in hard water can accumulate in pipes, water heaters, and appliances, leading to reduced efficiency and potentially costly repairs.

Soap and Detergent Efficiency

Have you ever struggled to get soap or detergent to lather up in your home? If you have hard water, this could be the culprit. Hard water makes it challenging for soap and detergent to dissolve, leading to increased product consumption and higher costs.

Skin and Hair Health

Bathing or washing with hard water can leave your skin feeling dry and itchy, and your hair may become dull and brittle. Soft water is much gentler on your skin and hair.

WATER HARDNESSSoftSlightly SoftModerately HardHardVery Hard

Water Hardness Classification

Water hardness is generally classified into five categories:

Soft Water

Soft water contains very low levels of calcium and magnesium and is gentle on your appliances, plumbing, and personal grooming. It lathers easily and doesn’t leave mineral deposits on fixtures.

Slightly Hard Water

Slightly hard water has a moderate mineral content. It’s suitable for most household tasks, but you may notice some soap and detergent inefficiency.

Moderately Hard Water

Moderately hard water has a higher mineral content, which can lead to scaling on appliances. Cleaning and grooming may require more soap or detergent.

Hard Water

Hard water contains a high concentration of minerals and can be tough on appliances, plumbing, and personal grooming. It often requires a water softening system for optimal use.

Determining Water Hardness by Zip Code

Now that you understand the significance of water hardness, let’s explore how you can find out the water hardness level in your area, specifically by zip code. This information is invaluable for making informed decisions about your water quality.

Using Government Resources

Many state and local government websites maintain databases of water quality information. To find the water hardness level by zip code in your area, follow these steps:

  1. Visit your state’s environmental agency website.
  2. Look for a section related to water quality or water testing.
  3. Search for a tool or database that allows you to enter your zip code or location.
  4. Enter your zip code, and the website should provide information on water hardness levels in your area.

Using Online Water Hardness Tools

Several online tools and websites are dedicated to providing information on water hardness by zip code. These tools are often user-friendly and provide comprehensive data on water quality. Here’s how to use them:

  1. Go to a reputable water hardness lookup website.
  2. Enter your zip code or location in the provided search bar.
  3. The website should generate a report detailing the water hardness level in your area, often in terms of parts per million (ppm) and grains per gallon (gpg).
  4. Some websites may also provide additional information about the water quality in your area, such as contaminants and treatment methods.

Interpreting Water Hardness Data

Once you have obtained information about water hardness in your area, you may wonder how to interpret the data. Typically, water hardness is measured in two units: parts per million (ppm) and grains per gallon (gpg).

Parts per Million (PPM)

PPM is a measure of the concentration of minerals in your water. The higher the ppm, the harder the water. Here’s a general guideline for interpreting ppm levels:

  • 0-17 ppm: Soft
  • 17-60 ppm: Slightly Soft
  • 60-120 ppm: Moderately Hard
  • 120-172 ppm: Hard
  • 172+ ppm: Very Hard

Grains per Gallon (GPG)

GPG is another common unit for measuring water hardness. It represents the number of grains of calcium and magnesium per gallon of water. The classification for gpg is as follows:

  • 0-1 gpg: Soft
  • 1-3.5 gpg: Slightly Soft
  • 3.5-7 gpg: Moderately Hard
  • 7-10 gpg: Hard
  • 10+ gpg: Very Hard

Taking Action Based on Water Hardness

Now that you know your water’s hardness level, you can make informed decisions to improve water quality in your home or business. Here are some actions you can take:

Softening Your Water

If you have hard water, you may want to consider installing a water softener. Water softeners work by removing calcium and magnesium ions from the water, reducing its hardness. This can help extend the lifespan of your appliances and improve the quality of your water.

Adjusting Detergent Use

Knowing your water’s hardness level can help you adjust the amount of detergent or soap you use in your laundry and dishwasher. With soft water, you can use less detergent to achieve the same cleaning results.

Protecting Appliances

To prevent mineral buildup in appliances like water heaters and coffee makers, consider using water filters or descaling solutions regularly.

Water Hardness by State

Let’s take a closer look at water hardness levels in different states across the United States. Please note that the values provided here are general classifications and should serve as a reference. Actual water hardness levels can vary within states and even within cities.


Understanding water hardness and knowing the water hardness level in your area is essential for maintaining your appliances, optimizing detergent use, and ensuring your water quality meets your preferences. By using online tools or local government resources, you can easily determine the water hardness by zip code and take appropriate actions to enjoy the benefits of the right water quality for your needs.

Whether you have soft, slightly hard, moderately hard, or hard water, you now have the knowledge to make informed decisions about your water and keep your home running smoothly.

Water hardness varies across regions, and this guide empowers you to take control of your water quality. With the information provided, you can make choices that positively impact your daily life, from the shower to your morning coffee. Remember, the key to great water is knowledge, and now you have it at your fingertips.

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