How hard is the water in Newnan, GA?

Tap water hardness
94mg/L
5.5gpg
Moderately hard

Reported by Coweta Water & Sewer Auth. · August 2025

GA typical
28 mg/L
EPA health violations since 2016
2
Softener for 3 people
24k grain
Data
Utility report

The water in Newnan carries roughly 94 mg/L of dissolved calcium and magnesium, or 5.5 grains per gallon. That is moderately hard water. The number comes from Coweta Water & Sewer Auth., dated August 2025.

Newnan on the hardness scale, with nearby cities
060120180240300360+GA typical 28Carrollton: 19 mg/LCarrollton 19Douglasville: 19 mg/LDouglasville 19Villa Rica: 19 mg/LVilla Rica 19Riverdale: 27 mg/LRiverdale 27Palmetto: 28 mg/LPalmetto 28Union City: 28 mg/LUnion City 28South Fulton: 28 mg/LSouth Fulton 28Peachtree City: 70 mg/LPeachtree City 70Tyrone: 70 mg/LTyrone 70Fayetteville: 70 mg/LFayetteville 70Newnan 94mg/L as calcium carbonate060120180240300360+GA 28Palmetto: 28 mg/LPalmetto 28Union City: 28 mg/LUnion City 28South Fulton: 28 mg/LSouth Fult. 28Peachtree City: 70 mg/LPeachtree. 70Tyrone: 70 mg/LTyrone 70Fayetteville: 70 mg/LFayettevil. 7094 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 94 mg/L, Newnan is 66 mg/L above the typical Georgia figure of 28. None of the 10 nearest cities we track has harder water. The range nearby runs from 19 mg/L in Carrollton to 70 in Peachtree City.

What 94 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 Newnan

3 people × 75 gallons a day × 5.5 gpg = 1,238 grains a day. A 24,000-grain unit regenerates about every 19 days.

Size it for your household

EPA record for Newnan's water system

Coweta Water & Sewer Auth. · PWSID GA0770042

2 health-based violations since 2016

Serves about 92,907 people from surface water.

Health-based
2
Monitoring or reporting
2
Open now
0
20162017201820192020202120222023202420252026Total trihalomethanes (TTHM)'16'18'20'22'24'26Total trihalomethanes (TTHM)
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Total trihalomethanes (TTHM)a disinfection byproduct22021–2022Resolved

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 Newnan water hard?

Somewhat. It measures about 94 mg/L (5.5 grains per gallon), which the USGS classes as moderately hard.

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

About 5.5 gpg. One grain per gallon equals 17.1 mg/L, so 94 mg/L divided by 17.1 gives 5.5.

What size water softener do I need in Newnan?

For 3 people using 75 gallons each per day, 5.5 gpg works out to about 1,238 grains a day. A 24,000-grain softener covers that with a regeneration about every 19 days.

Has the Newnan water system had EPA violations?

EPA records show 2 health-based violations for Coweta Water & Sewer Auth. since 2016, involving Total trihalomethanes (TTHM). There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 85 cities in Georgia

Hardness data: TapWaterData US Water Hardness (utility report, August 27, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.