North Decatur Water Hardness & Quality Report (2026)
Water Hardness
8.8 grains per gallon
Source
reservoir
pH Level
8.1
neutral = 7.0
Lead
0.009 mg/L
✓ Below action level
TDS
403.7 mg/L
Est. Daily Cost
$0.40
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 North Decatur, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In North Decatur | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.6 yrs | 8.5 yrs | -46% |
| Washing Machine | 8.1 yrs | 12 yrs | -33% |
| Water Heater | 9.6 yrs | 15 yrs | -36% |
Regional Water Comparison
How North Decatur compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ North Decatur, Georgia | 150 mg/L | 9.5 ppt | 🟠 Hard | reservoir |
| Decatur, Georgia | 112 mg/L | 6.6 ppt | 🟡 Moderately Hard | reservoir |
| North Druid Hills, Georgia | 150 mg/L | 9.5 ppt | 🟠 Hard | reservoir |
| Druid Hills, Georgia | 142 mg/L | 8.9 ppt | 🟠 Hard | reservoir |
| Belvedere Park, Georgia | 147.5 mg/L | 9.2 ppt | 🟠 Hard | reservoir |
National Benchmark
How North Decatur compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ North Decatur | 150 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes North Decatur's Water Unique?
Local geology and source profile
North Decatur, Georgia, in DeKalb County — an unincorporated DeKalb County community adjacent to Decatur and Druid Hills in the north Atlanta metro — receives its municipal water from DeKalb County Department of Watershed Management, drawing from the Chattahoochee River (Lake Lanier, Buford Dam) through the Snapfinger Creek and Scott Water Treatment Plants (DeKalb County).
The moderately hard 150 mg/L hardness and TDS of 403.7 mg/L (elevated TDS for the hardness, suggesting additional mineral loading beyond carbonates) reflect the north metro Atlanta Chattahoochee supply's character. The Chattahoochee River at Atlanta drains the Georgia Blue Ridge (Precambrian Brasstown Gneiss — mostly insoluble), and the Georgia Piedmont (Ordovician Hillabee Greenstone — moderately calcareous, Cambrian Cartersville shale). DeKalb County's distribution infrastructure (older pipe network in mature suburban areas) may contribute to the elevated TDS relative to the source water.
At 150 mg/L, North Decatur's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 9.5 ppt warrants a certified reverse osmosis drinking water filter — Dobbins Air Reserve Base (Cobb County AFFF — Chattahoochee watershed), Atlanta Hartsfield-Jackson Airport (AFFF — major metro Atlanta PFAS source), and the northeast Atlanta industrial corridor contribute to North Decatur's elevated readings.
Geology & Source: North Decatur in DeKalb County draws from DeKalb County Water on the Chattahoochee River (DeKalb County, metro Atlanta) — the Chattahoochee at Atlanta drains the Georgia Blue Ridge (Precambrian Brasstown Gneiss — mostly insoluble) and the Georgia Piedmont (Ordovician Hillabee Greenstone, calcareous) — Georgia DeKalb County Chattahoochee Piedmont watershed produces moderately hard water at 150 mg/L with TDS 403.7 mg/L in this DeKalb County Georgia community.