How hard is the water in Farmington, AR?

Tap water hardness
77mg/L
4.5gpg
Moderately hard

Reported by Fayetteville Waterworks · September 2025

AR typical
39 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

Tap water in Farmington has about 77 mg/L of hardness, which is 4.5 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from Fayetteville Waterworks, dated September 2025.

Farmington on the hardness scale, with nearby cities
060120180240300360+AR typical 39Bentonville: 55 mg/LBentonville 55Centerton: 55 mg/LCenterton 55Lowell: 62 mg/LLowell 62Cave Springs: 62 mg/LCave Springs 62Rogers: 67 mg/LRogers 67Prairie Grove: 68 mg/LPrairie Grove 68Fayetteville: 77 mg/LFayetteville 77Springdale: 77 mg/LSpringdale 77Bella Vista: 107 mg/LBella Vista 107Siloam Springs: 113 mg/LSiloam Springs 113Farmington 77mg/L as calcium carbonate060120180240300360+AR 39Lowell: 62 mg/LLowell 62Cave Springs: 62 mg/LCave Sprin. 62Prairie Grove: 68 mg/LPrairie Gr. 68Fayetteville: 77 mg/LFayettevil. 77Springdale: 77 mg/LSpringdale 77Siloam Springs: 113 mg/LSiloam Spr. 11377 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Farmington sits 38 mg/L above the typical Arkansas figure of 39. Of the 10 nearest cities we track, 6 have softer water and 2 have harder. The range nearby runs from 55 mg/L in Bentonville to 113 in Siloam Springs.

What 77 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.

What to do about it

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Farmington

3 people × 75 gallons a day × 4.5 gpg = 1,008 grains a day. A 24,000-grain unit regenerates about every 23 days.

Size it for your household

EPA record for Farmington's water system

Fayetteville Waterworks · PWSID AR0000569

No health-based violations since 2016

Serves about 116,398 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

TapWaterData ties Farmington to this system. EPA's service-area records do not name Farmington, so check the utility printed on your water bill.

Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.

Questions

Is Farmington water hard?

Somewhat. It measures about 77 mg/L (4.5 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Farmington in grains per gallon?

About 4.5 gpg. One grain per gallon equals 17.1 mg/L, so 77 mg/L divided by 17.1 gives 4.5.

What size water softener do I need in Farmington?

For 3 people using 75 gallons each per day, 4.5 gpg works out to about 1,008 grains a day. A 24,000-grain softener covers that with a regeneration about every 23 days.

Has the Farmington water system had EPA violations?

EPA records show no health-based violations for Fayetteville Waterworks since 2016.

Nearby cities

All 46 cities in Arkansas

Hardness data: TapWaterData US Water Hardness (utility report, September 29, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.