Arkansas runs as four working zones. Little Rock and central Arkansas on Central Arkansas Water's Lake Maumelle and Lake Winona surface supply. Northwest Arkansas (Fayetteville, Bentonville, Rogers, Springdale) on Beaver Water District's Beaver Lake surface supply, which Fayetteville and Springdale both report as moderately hard. The Arkansas River Valley corridor (Fort Smith, Russellville) on Arkansas River-and-aquifer-supplemented supply. The Delta and eastern Arkansas (Jonesboro, West Memphis, Pine Bluff) on Mississippi Embayment alluvial-aquifer supply. The Ozark and Ouachita rural well-water on local aquifer and well-water systems.
HOW IT BREAKS DOWNmoderately hard (Fayetteville, Springdale); 3 of 5 covered cities publish no figure
Central Arkansas Water Lake Maumelle supply publishes no hardness figure the site uses; Northwest Arkansas publishes moderately hard in Fayetteville and Springdale. Walmart corporate-campus institutional commercial concentration in Bentonville drives substantial high-end commercial book. Razorback athletics commercial concentration through Fayetteville. Southern pine-pollen wave March-April. Severe-weather and tornado activity heavy April-May. Heat-load extreme July-August. Mississippi River corridor flooding-event residue handling on Delta corridor. Heritage residential concentration through Little Rock Quapaw Quarter, Eureka Springs, Hot Springs, and the surrounding pre-1900 heritage corridors. Winter exterior work reduced January-February but not fully shut down. Foliage-season commercial concentration October-November in Ozark corridor.
A blended system means hardness moves with the blend. Two addresses on the same utility can read differently, and the same address can read differently across a year, depending on which source is carrying the load that season.
Arkansas sits in one band statewide, so the answer is the same everywhere in it.
Tap water is still fine for most residential glass, with two exceptions worth knowing. Dark glass shows a faint mineral haze that lighter glass hides, and glass that is hot enough to flash the water off before you pull the squeegee will spot regardless of how soft the supply is. On both, a distilled final rinse costs about a dollar a window and removes the variable entirely. Everywhere else at this level, the water is not what is wrong.
Hardest first — the order that matters, because the hard end is where the method has to change. Each figure is the named utility's own published number; cities whose utility publishes none are listed after them, without a band. Within Arkansas the spread runs from Springdale at 74 mg/L to Fayetteville at 74 mg/L — a difference big enough that the same bottle of cleaner behaves differently in each.
Where Arkansas's city pages sit in the national city rankings: hardness rank out of 185 cities whose utility publishes a figure, dissolved-solids rank out of 100, the disinfectant each utility reports, and the months each city's cleaning calendar marks for a wash. Rank 1 is the hardest or most mineral-heavy.
| CITY | HARDNESS RANK | TDS RANK | DISINFECTANT | WASH IN |
|---|---|---|---|---|
| Fayetteville | 127 / 18574 mg/L | 72 / 100115 mg/L | not published | Jul |
| Springdale | 127 / 18574 mg/L | 72 / 100115 mg/L | not published | Jul |
| Fort Smith | not ranked | not ranked | free chlorine | Jul, Oct |
| Jonesboro | not ranked | not ranked | free chlorine | Jun |
| Little Rock | not ranked | not ranked | free chlorine | Jun |
This page is about Arkansas's water and nothing else. For how cleaning actually works in Arkansas across the year — climate, seasonal timing, the local contaminants, the housing stock — see the Arkansas cleaning guide.
For a figure at your own address rather than your city, the Hard Water Scorer takes a ZIP code. If you run a pure-water system, the TDS diagnostic reads the other end of the same problem.
Each covered city utility's own published figure, taken from its most recent annual water quality report (Consumer Confidence Report) or its water-quality page, read in 2026. A city figure is the one its utility publishes for the service area, as a single number or the range it reports; it is not a reading from any one tap. A state range runs from the lowest to the highest figure published by the utilities we cover in that state, so it brackets those cities rather than describing an average resident. A state where no covered utility publishes a figure shows a planning estimate, labelled as one.
Private wells are outside all of it. A well is whatever the rock under it says, and the only number that describes one is a test of that tap. Have a reading that disagrees with this table? Send it to us — a number that contradicts the table is worth more than one that confirms it.