How does Alpharetta's water compare to the national average?

The USA national average is 151 mg/L. Alpharetta (20 mg/L) is 131 mg/L softer than average.

Alpharetta Water Hardness & Quality Report (2026)

Water Hardness

20mg/L

Soft

1.2 grains per gallon

Source

reservoir

pH Level

7.4

neutral = 7.0

Lead

0.001 mg/L

✓ Below action level

TDS

113.1 mg/L

Est. Daily Cost

$0.05

energy & soap waste

Source: See methodology section below · Updated 2026

20mg/L as CaCO₃Soft

0–60

mg/L

Soft

61–120

mg/L

Moderately Hard

121–180

mg/L

Hard

180+

mg/L

Very Hard

Appliance Damage Report

In Alpharetta, your appliances are currently losing 3% efficiency due to mineral buildup.

Appliance	In Alpharetta	Soft Water City	Efficiency Loss
Kettle	8.9 yrs	8.5 yrs	—
Washing Machine	12.9 yrs	12 yrs	—
Water Heater	14.8 yrs	15 yrs	-1%

Regional Water Comparison

How Alpharetta compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Alpharetta, Georgia	20 mg/L	0 ppt	🟢 Soft	reservoir
Milton, Georgia	≈ 120–179 mg/L	4.6 ppt	🟠 Hard	groundwater
Roswell, Georgia	≈ 0–60 mg/L	63.8 ppt	🟢 Soft	reservoir
Johns Creek, Georgia	≈ 0–60 mg/L	4.6 ppt	🟢 Soft	reservoir
Peachtree Corners, Georgia	135 mg/L	8.4 ppt	🟠 Hard	reservoir

National Benchmark

How Alpharetta compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Alpharetta	20 mg/L	🟢 None
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Alpharetta's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 113.1 mg/LpH: 7.4

Alpharetta, GA receives its water from Fulton County's Department of Public Works, which supplies the service area encompassing Alpharetta and surrounding North Fulton County communities, serving over 1 million residents across the county. Primary sources include surface water from the Chattahoochee River, treated at the R. Dalrymple Water Treatment Plant near Atlanta, and supplemental groundwater from wells tapping the Floridan aquifer.

The Chattahoochee River watershed spans the southern Appalachians to the Gulf coastal plain, with Alpharetta's intake in the Piedmont region featuring granitic gneiss and schist overlain by red clay soils. Groundwater supplements come from the Floridan aquifer, a Paleogene limestone system with karst features that promote quick recharge and minimal mineralization. Rapid river flow and aquifer dynamics limit dissolution of hardness minerals from rock formations, yielding a very soft supply at just 20 mg/L.

With soft water, scale buildup is negligible, extending the life of water heaters, dishwashers, and washing machines without limescale issues. Soap and detergents lather efficiently, reducing usage, and skin feels less dry. No water softener is needed or recommended; basic filtration for taste is sufficient if chlorine is noticeable. The utility reports pH around 7.5–8.5, with full compliance on the lead and copper rule; disinfectants including chloramines are used post-filtration, and occasional low-level trihalomethanes remain below MCLs.

Geology & Source: Chattahoochee River Piedmont watershed over granitic gneiss and schist; Floridan aquifer Paleogene limestone-karst with rapid recharge — limited carbonate contact yields very soft supply

Other Georgia Water Reports

Milton

≈ 120–179 mg/L

🟠 Hard

Roswell

≈ 0–60 mg/L

🟢 Soft

Johns Creek

≈ 0–60 mg/L

🟢 Soft

Peachtree Corners

135 mg/L

🟠 Hard

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Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Alpharetta's water safe to drink?

Yes. Alpharetta's water meets all federal safety standards. The hardness is 20 mg/L (Soft), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Alpharetta?

Alpharetta's water is soft at 20 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Alpharetta compare to the USA average?

The USA national average is 151 mg/L. Alpharetta (20 mg/L) is 131 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Alpharetta is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.