The US Water Hardness By Zip Code & City Name

In this article, you will find the water hardness by zip code and city name from 50 states of the U.S.A.

2 steps to find your water hardness level by zip code or city name.

  • Choose your state
  • Input a city name or zip code into the table’s search box

Alaska – AK

Zip CodePPMGPGHardness LevelCityStateOther ZIP codes
99501633.68Moderately HardAnchorageAK99501 99502 99503 99504 99505 99506 99507 99508 99509 99510 99511 99513 99514 99515 99516 99517 99518 99519 99520 99521 99522 99523 99524 99529 99530 99540 99599 99695 40223 84015
997011428.3HardFairbanksAK99701 99702 99705 99706 99707 99708 99709 99710 99711 99712 99714 99716 99767 99775 99790 72131 47849 71240 55602
998011388.07HardJuneauAK99801 99802 99803 99811 99812 99821 99824 99850 15767 53039
996111247.25HardKenaiAK99611 99635
996451005.85Moderately HardPalmerAK99645 72069 50571 62556 46307 66962 01069 49871 68864 12822 18043 18045 37365 75152 98051
99835382.22Slightly HardSitkaAK99835 99836 41255 57472
996691196.96Moderately HardSoldotnaAK99669
99686653.8Moderately HardValdezAK99686 87580
996291207.02HardWasillaAK99629 99652 99654 99687 99694

For example, as the table above, Alaska – AK water is considered Moderately Hard. The average water hardness by zip code in Alaska is about 99PPM or 5.79 GPG.

There is water hardness data for 9 cities (75 Zip codes) from Alaska collected, 4 of the cities have Moderately Hard water, 4 of them have Hard water, and 1 have Slightly Hard water.

As an overview:

  • We have water hardness data of 9868 Zip codes, 460 Cities in 50 States of the USA.
  • 32% of the cities (about 145 cities or 2730 Zip codes) have Very hard water levels while only 4% (19 cities or 167 Zip codes) have Soft water.
  • Bullhead City from Arizona is the city that has the hardest water with a level of 619 PPM.

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Percentage of US water hardness level by zip code and city name
Percentage of US water hardness level by zip code and city name

Water Hardness Levels Classification

Mg/L or PPMGrains/GalHardness Level
0 – 17.10 – 1Soft
17.1 – 601 – 3.5Slightly hard
60 – 1203.5 – 7.0Moderately hard
120 – 1807.0 – 10.5Hard
from 180from 10.5Very Hard
(Source: The U.S. Department of Interior and the Water Quality Association)

Hard Water Solutions

Water Hardness By Zip Code & City Name of the other States.

Here you can find water hardness (is your water hard or soft) or your area by zip code or city name by click on your state.

Alabama – AL

Alabama – AL water is considered Moderately Hard. The average water hardness by zip code in Alabama is about 83 PPM or 4.85 GPG.

There is water hardness data for 7 cities (181 Zip codes) from Alabama collected, 4 of the cities have Moderately Hard water, 2 of them have Hard water, 1 have slightly hard.

Arkansas – AR

Arkansas – AR water is considered Slightly Hard. The average water hardness by zip code in Arkansas is about 33 PPM or 1.93 GPG.

There is water hardness data for 7 cities (87 Zip codes) from Arkansas collected, 6 of the cities have Slightly Hard water, and 1 of them have Moderately Hard water.

Arizona – AZ

Arizona – AZ water is considered Very Hard. The average water hardness by zip code in Arizona is about 247 PPM or 14.44 GPG.

There is water hardness data for 10 cities (152 Zip codes) from Arizona collected, 9 of the cities have Very Hard water, and 1 have Hard water.

California – CA

California – CA water is considered Hard. The average water hardness by zip code in California is about 169 PPM or 9.88 GPG.

There is water hardness data for 23 cities (430 Zip codes) from California collected, 10 of the cities have Very Hard water, 7 of them have Hard water, 4 have Moderately Hard water, and 2 have Slightly Hard water.

Colorado – CO

Colorado – CO water is considered Hard. The average water hardness by zip code in Colorado is about 126 PPM or 7.37 GPG.

There is water hardness data for 12 cities (205 Zip codes) from Colorado collected, 2 of the cities have Hard water, 5 of them have Very Hard water, and 5 have Moderately Hard water.

Connecticut – CT

Connecticut water is considered Hard. The average water hardness by zip code in Connecticut is about 169 PPM or 9.88 GPG.

There is water hardness data for 6 cities (148 Zip codes) from Connecticut collected, 5 of the cities have Hard water, and 1 of them have Very Hard water.

Delaware – DE

Delaware – DE water is considered Hard. The average water hardness by zip code in Delaware is about 132 PPM or 7.72 GPG.

There is water hardness data for 2 cities (38 Zip codes) from Delaware collected, both of the cities have Hard water.

Florida – FL

Florida – FL water is considered Very Hard. The average water hardness by zip code in Florida is about 194 PPM or 11.35 GPG.

There is water hardness data for 17 cities (517 Zip codes) from Florida collected, 10 of the cities have Very Hard water, 6 of them have Hard water, and 1 have Moderately Hard water.

Georgia – GA

Georgia – GA water is considered Slightly Hard. The average water hardness by zip code in Georgia is about 39 PPM or 2.28 GPG.

There is water hardness data for 13 cities (224 Zip codes) from Georgia collected, 8 of the cities have Slightly Hard water, 1 of them have Hard water, 3 have Moderately Hard water, and 1 have Soft water.

Hawaii – HI

Hawaii water is considered Slightly Hard. The average water hardness by zip code in Hawaii is about 34 PPM or 1.99 GPG.

There is water hardness data for 7 cities (44 Zip codes) from Hawaii collected, 3 of the cities have Soft water, 3 of them have Slightly Hard water, and 1 have Moderately Hard water.

Iowa – IA

Iowa – IA water is considered Very Hard. The average water hardness by zip code in Iowa is about 215 PPM or 12.57 GPG.

There is water hardness data for 7 cities (118 Zip codes) from Iowa collected, 6 of the cities have Very Hard water, and 1 of them have Hard water.

Idaho – ID

Idaho – ID water is considered Hard. The average water hardness by zip code in Idaho is about 134 PPM or 7.84 GPG.

There is water hardness data for 6 cities (41 Zip codes) from Idaho collected, 1 of the cities have Hard water, 2 of them have Very Hard water, 2 have Moderately Hard water, and 1 have Soft water.

Illinois – IL

Illinois – IL water is considered Very Hard. The average water hardness by zip code in Illinois is about 185 PPM or 10.82 GPG.

There is water hardness data for 11 cities (350 Zip codes) from Illinois collected, 2 of the cities have Hard water, 7 of them have Very Hard water, 1 have Slightly Hard water, and 1 have Moderately Hard water.

Indiana – IN

Indiana – IN water is considered Very Hard. The average water hardness by zip code in Indiana is about 223 PPM or 13.04 GPG.

There is water hardness data for 10 cities (235 Zip codes) from Indiana collected, 6 of the cities have Very Hard water, and 4 of them have Hard water.

Kansas – KS

Kansas – KS water is considered Very Hard. The average water hardness by zip code in Kansas is about 233 PPM or 13.63 GPG.

There is water hardness data for 8 cities (87 Zip codes) from Kansas collected, 5 of the cities have Very Hard water, 2 of them have Hard water, and 1 have Moderately Hard water.

Kentucky – KY

Kentucky – KY water is considered Hard. The average water hardness by zip code in Kentucky is about 171 PPM or 10 GPG.

There is water hardness data for 6 cities (92 Zip codes) from Kentucky collected, 2 of the cities have Hard water, 1 of them have Moderately Hard water, 1 have water, 1 have Slightly Hard water, and 1 have Soft water.

Louisiana – LA

Louisiana – LA water is considered Hard. The average water hardness by zip code in Louisiana is about 146 PPM or 8.54 GPG.

There is water hardness data for 7 cities (166 Zip codes) from Louisiana collected, 2 of the cities have Slightly Hard water, 1 of them have Very Hard water, 1 have Moderately Hard water, 1 have Hard water, and 2 have Soft water.

Massachusetts – MA

Massachusetts – MA water is considered Moderately Hard. The average water hardness by zip code in Massachusetts is about 68 PPM or 3.98 GPG.

There is water hardness data for 6 cities (116 Zip codes) from Massachusetts collected, 5 of the cities have Moderately Hard water, and 1 of them have Slightly Hard water.

Maryland – MD

Maryland – MD water is considered Hard. The average water hardness by zip code in Maryland is about 132 PPM or 7.72 GPG.

There is water hardness data for 6 cities (349 Zip codes) from Maryland collected, 2 of the cities have Very Hard water, and 4 of them have Moderately Hard water.

Maine – ME

Maine water is considered as Soft level. The average water hardness by zip code in Maine is about 10PPM or 0.58 GPG.

There is water hardness data for 6 cities (31 Zip codes) from Maine collected and all of the cities have Soft water.

Michigan – MI

Michigan water is considered as Hard level. The average water hardness by zip code in Michigan is about 163PPM or 9.53 GPG.

There is water hardness data for 12 cities (158 Zip codes) from Michigan collected, 5 of the cities have Hard water, 5 of them have Moderately Hard water, and 2 have Very Hard water.

Minnesota – MN

Minnesota water is considered as Hard level. The average water hardness by zip code in Minnesota is about 131PPM or 7.66 GPG.

There is water hardness data for 11 cities (168 Zip codes) from Minnesota collected, 7 of the cities have Very Hard water, 1 of them have Slightly Hard water, 1 have Moderately Hard water, and 2 have Hard water.

Missouri – MO

Missouri water is considered as Hard level. The average water hardness by zip code in Missouri is about 170PPM or 9.94 GPG.

There is water hardness data for 6 cities (131 Zip codes) from Missouri collected, 5 of the cities have Hard water, and 1 of them have Very Hard water.

Mississippi – MS

Mississippi water is considered as Hard level. The average water hardness by zip code in Mississippi is about 166PPM or 9.71 GPG.

There is water hardness data for 5 cities (91 Zip codes) from Mississippi collected, 4 of the cities have Hard water, and 1 of them have Very Hard water.

Montana – MT

Montana water is considered as Moderately Hard level. The average water hardness by zip code in Montana is about 74PPM or 4.33 GPG.

There is water hardness data for 9 cities (61 Zip codes) from Montana collected, 4 of the cities have Slightly Hard water, 2 of them have Moderately Hard water, 2 have Hard water, and 1 have Very Hard water.

North Carolina – NC

North Carolina water is considered as Moderately Hard level. The average water hardness by zip code in North Carolina is about 66PPM or 3.86 GPG.

There is water hardness data for 12 cities (388 Zip codes) from North Carolina collected, 7 of the cities have Slightly Hard water, 4 of them have Moderately Hard water, and 1 have Hard water.

North Dakota – ND

North Dakota water is considered as Very Hard level. The average water hardness by zip code in North Dakota is about 231PPM or 13.51 GPG.

There is water hardness data for 5 cities (44 Zip codes) from North Dakota collected, 2 of the cities have Hard water, 3 of them have Very Hard water.

Nebraska – NE

Nebraska water is considered as Very Hard level. The average water hardness by zip code in Nebraska is about 200PPM or 11.7 GPG.

There is water hardness data for 8 cities (122 Zip codes) from Nebraska collected, 6 of the cities have Very Hard water, 1 of them have Slightly Hard water, 1 have Hard water.

New Hampshire – NH

New Hampshire water is considered as Slightly Hard level. The average water hardness by zip code in New Hampshire is about 57PPM or 3.33 GPG.

There is water hardness data for 3 cities (49 Zip codes) from New Hampshire collected, 2 of the cities have Slightly Hard water, 1 of them have Moderately Hard water.

New Jersey – NJ

New Jersey water is considered as Moderately Hard level. The average water hardness by zip code in New Jersey is about 113PPM or 6.61 GPG.

There is water hardness data for 5 cities (208 Zip codes) from New Jersey collected, 2 of the cities have Moderately Hard water, 3 of them have Very Hard water.

New Mexico – NM

New Mexico water is considered as Very Hard level. The average water hardness by zip code in New Mexico is about 192PPM or 11.23 GPG.

There is water hardness data for 7 cities (103 Zip codes) from New Mexico collected, 4 of the cities have Hard water, 3 of them have Very Hard water.

Nevada – NV

Nevada water is considered as Very Hard level. The average water hardness by zip code in Nevada is about 288PPM or 16.84 GPG.

There is water hardness data for 9 cities (146 Zip codes) from Nevada collected and all of the cities have Very Hard water.

New York – NY

New York water is considered as Moderately Hard level. The average water hardness by zip code in New York is about 70PPM or 4.09 GPG.

There is water hardness data for 12 cities (255 Zip codes) from New York collected, 6 of the cities have Slightly Hard water, 1 of them have Moderately Hard water, 1 have Soft water, 4 have Hard water.

Ohio – OH

Ohio water is considered as Hard level. The average water hardness by zip code in Ohio is about 150PPM or 8.77 GPG.

There is water hardness data for 5 cities (268 Zip codes) from Ohio collected, 2 of the cities have Moderately Hard water, 1 of them have Hard water, 1 have Very Hard water, 1 have Slightly Hard water.

Oklahoma – OK

Oklahoma water is considered as Hard level. The average water hardness by zip code in Oklahoma is about 150PPM or 8.77 GPG.

There is water hardness data for 5 cities (125 Zip codes) from Oklahoma collected, 1 of the cities have Very Hard water, 4 of them have Hard water.

Oregon – OR

Oregon water is considered as Slightly Hard level. The average water hardness by zip code in Oregon is about 27PPM or 1.58 GPG.

There is water hardness data for 7 cities (78 Zip codes) from Oregon collected, 6 of the cities have Slightly Hard water, 1 of them have Moderately Hard water.

Pennsylvania – PA

Pennsylvania water is considered as Hard level. The average water hardness by zip code in Pennsylvania is about 152PPM or 8.89 GPG.

There is water hardness data for 20 cities (372 Zip codes) from Pennsylvania collected, 6 of the cities have Very Hard water, 8 of them have Hard water, 1 have Slightly Hard water, 1 have Soft water, 4 have Moderately Hard water.

Rhode Island – RI

Rhode Island water is considered as Slightly Hard level. The average water hardness by zip code in Rhode Island is about 54PPM or 3.16 GPG.

There is water hardness data for 4 cities (37 Zip codes) from Rhode Island collected, 3 of the cities have Slightly Hard water, 1 of them have Moderately Hard water.

South Carolina – SC

South Carolina water is considered as Moderately Hard level. The average water hardness by zip code in South Carolina is about 73PPM or 4.27 GPG.

There is water hardness data for 9 cities (191 Zip codes) from South Carolina collected, 8 of the cities have Slightly Hard water, 1 of them have Hard water.

South Dakota – SD

South Dakota water is considered as Very Hard level. The average water hardness by zip code in South Dakota is about 237PPM or 13.86 GPG.

There is water hardness data for 10 cities (42 Zip codes) from South Dakota collected, 9 of the cities have Very Hard water, 1 of them have Moderately Hard water.

Tennessee – TN

Tennessee water is considered as Moderately Hard level. The average water hardness by zip code in Tennessee is about 93PPM or 5.44 GPG.

There is water hardness data for 11 cities (228 Zip codes) from Tennessee collected, 8 of the cities have Moderately Hard water, 1 of them have Very Hard water, 1 have Hard water, 1 have Slightly Hard water.

Texas – TX

Texas water is considered as Very Hard level. The average water hardness by zip code in Texas is about 183PPM or 10.7 GPG.

There is water hardness data for 24 cities (802 Zip codes) from Texas collected, 11 of the cities have Very Hard water, 3 of them have Slightly Hard water, 1 have Soft water, 2 have Moderately Hard water, 7 have Hard water.

Utah – UT

Utah water is considered as Very Hard level. The average water hardness by zip code in Utah is about 259PPM or 15.15 GPG.

There is water hardness data for 9 cities (42 Zip codes) from Utah collected, 6 of the cities have Very Hard water, 3 of them have Hard water.

Virginia – VA

Virginia water is considered as Moderately Hard level. The average water hardness by zip code in Virginia is about 68PPM or 3.98 GPG.

There is water hardness data for 13 cities (266 Zip codes) from Virginia collected, 5 of the cities have Slightly Hard water, 8 of them have Moderately Hard water.

Vermont – VT

Washington – WA

Wisconsin – WI

West Virginia – WV

Wyoming – WY

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