Decatur Water Hardness & Quality Report (2026)
Water Hardness
6.5 grains per gallon
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
237.6 mg/L
Est. Daily Cost
$0.30
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
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 Decatur, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Decatur | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.9 yrs | 8.5 yrs | -31% |
| Washing Machine | 9.5 yrs | 12 yrs | -21% |
| Water Heater | 11.1 yrs | 15 yrs | -26% |
Regional Water Comparison
How Decatur compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Decatur, Georgia | 112 mg/L | 6.6 ppt | 🟡 Moderately Hard | reservoir |
| North Decatur, Georgia | 150 mg/L | 9.5 ppt | 🟠 Hard | reservoir |
| Belvedere Park, Georgia | 147.5 mg/L | 9.2 ppt | 🟠 Hard | reservoir |
| Druid Hills, Georgia | 142 mg/L | 8.9 ppt | 🟠 Hard | reservoir |
| North Druid Hills, Georgia | 150 mg/L | 9.5 ppt | 🟠 Hard | reservoir |
National Benchmark
How Decatur compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Decatur | 112 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Decatur's Water Unique?
Local geology and source profile
Decatur, Georgia, in DeKalb County — the DeKalb County seat adjacent to the City of Atlanta, a vibrant in-town suburb known for its downtown square, progressive community character, and the Decatur Book Festival, one of the largest literary events in the South — receives its municipal water from the City of Decatur Utilities or DeKalb County Department of Watershed Management, which draws from the Chattahoochee River through the Atlanta Regional Commission's water supply system. Metro Atlanta draws from the Chattahoochee at multiple intake points for its major suburban utilities.
The moderately hard 112 mg/L hardness and TDS of 237.6 mg/L reflect the Chattahoochee River's watershed geology at the Atlanta metropolitan reach. The Chattahoochee River at Lanier-metro Atlanta drains the Blue Ridge Province of north Georgia — the Dahlonega Gold Belt (Paleozoic and Precambrian metasedimentary and volcanic rocks), the Inner Piedmont crystalline complex, and the Brevard Fault Zone transitional terrain — all predominantly low-carbonate crystalline terrain producing inherently soft to moderately soft water. The moderately hard reading (112 mg/L) reflects the Chattahoochee's combination of relatively fresh Blue Ridge headwater runoff with moderate dissolved mineral contributions from the longer transit through the Georgia Piedmont metamorphic terrain.
At 112 mg/L, Decatur's water is moderately hard — a reasonable household supply for the metro Atlanta region. Scale builds in kettles and appliances over months, the dishwasher benefits from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling of heating appliances is the standard schedule. The PFAS level of 6.6 ppt warrants a certified drinking water filter — the metro Atlanta corridor's military bases (Dobbins Air Reserve Base in Marietta), Hartsfield-Jackson Airport, the Chattahoochee River basin's suburban runoff from the dense Atlanta metropolitan development, and Georgia's chemical and industrial manufacturing legacy all contribute to the DeKalb County supply's PFAS background.
Geology & Source: Decatur in DeKalb County is served by DeKalb County Watershed or the City of Decatur utilities drawing from the Chattahoochee River via the Atlanta Regional Commission water system — the Chattahoochee at the Atlanta reach drains the Blue Ridge Province (Dahlonega Gold Belt Precambrian metasedimentary and volcanic rocks) — Blue Ridge and Piedmont watershed drainage produces moderately hard water at 112 mg/L with TDS 238 mg/L in this DeKalb County Atlanta suburb.