State water index

Arkansas water hardness

Search 180 indexed communities and 210 ZIP profiles, then compare the underlying utility, source, distance, and reporting context.

Median regional evidence

89PPM

Moderately Hard

Indexed range 3.1–489 PPM

ZIP profiles: 210
Cities: 180
Matched utilities: 180
Counties: 72

Understanding Arkansas

Why local comparisons matter here

Arkansas includes the Ozarks, Ouachita Mountains, Arkansas River Valley, and Mississippi Alluvial Plain. Carbonate and sandstone uplands differ from the sediments and large aquifers of the east.

In this index, soft is the largest category, covering 68 of 167 profiles with hardness data. The state median is 89 PPM, but the full indexed range is 3.1–489 PPM.

State distribution

Hardness across indexed ZIPs

Counts describe published ZIP profiles, not a population-weighted statewide sample.

Soft · 0–60 PPM68

Moderately hard · 61–120 PPM31

Hard · 121–180 PPM20

Very hard · 181+ PPM48

Evidence coverage

What the current records support

Hardness estimate: 80%
Lead 90th percentile: 98%
Copper 90th percentile: 8%

Low-confidence hardness profiles

Research-comparison eligible profiles

Reported source water

Utility source mix

Surface water: 99
Groundwater: 80
Groundwater influenced by surface water: 1

Highest medians

Highest eligible city medians

1. Fayetteville79 PPM

Lowest medians

Lowest eligible city medians

1. Fayetteville79 PPM

City directory

Explore Arkansas by city

Search by city or county, then sort by name, hardness, or ZIP coverage.

180 cities · 210 ZIP profiles

Search city or county

County

Sort by

180 cities found

Page 1 of 8

Alma

Crawford County · 1 ZIP

46PPM regional

County	Median	Range	ZIP profiles
Phillips County	427 PPM	253.1–427	3
Arkansas County	414 PPM	404–423	2
Chicot County	400 PPM	399.5–399.5	1
Ashley County	321 PPM	321–321	1
Baxter County	321 PPM	165.5–321	3
Jackson County	310 PPM	309.5–489	3
Lee County	302 PPM	302–302	1
Monroe County	286 PPM	268–343.5	3
Craighead County	272 PPM	14.6–430.5	9
Prairie County	267 PPM	253–281	2
Fulton County	260 PPM	249–271	2
Lawrence County	259 PPM	240.5–278	4

Why local comparisons matter here

Hardness across indexed ZIPs

What the current records support

Utility source mix

Highest eligible city medians

Lowest eligible city medians

Explore Arkansas by city

Alma

Arkadelphia

Ash Flat

Ashdown

Atkins

Austin

Bald Knob

Barling

Batesville

Bay

Bearden

Beebe

Benton

Bentonville

Bergman

Berryville

Black Rock

Blytheville

Bono

Booneville

Brinkley

Brookland

Bryant

Bull Shoals

Highest regional-evidence county medians