Decatur Water Hardness & Quality Report (2026)
Water Hardness
3.3 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
93.4 mg/L
Est. Daily Cost
$0.15
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 7% efficiency due to mineral buildup.
| Appliance | In Decatur | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.8 yrs | 8.5 yrs | -8% |
| Washing Machine | 11.5 yrs | 12 yrs | -4% |
| Water Heater | 13.4 yrs | 15 yrs | -11% |
Regional Water Comparison
How Decatur compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Decatur, Alabama | 56 mg/L | 3.9 ppt | 🟢 Soft | reservoir |
| Hartselle, Alabama | 65 mg/L | 4.2 ppt | 🟡 Moderately Hard | reservoir |
| Athens, Alabama | 91 mg/L | 5.2 ppt | 🟡 Moderately Hard | reservoir |
| Madison, Alabama | 69.5 mg/L | 4.4 ppt | 🟡 Moderately Hard | reservoir |
| Huntsville, Alabama | 39.5 mg/L | 3.3 ppt | 🟢 Soft | reservoir |
National Benchmark
How Decatur compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Decatur | 56 mg/L | 🟢 None |
| 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, Alabama, in Morgan County on the Tennessee River (Wheeler Lake) in the Tennessee Valley — a major Tennessee Valley industrial city known for its chemical manufacturing (3M, Vinyls), poultry processing (Mountaire, Wayne Farms), and the Mooresville historic district — draws its municipal water supply from Wheeler Lake (Tennessee River) via the City of Decatur Utilities Water Division, treating Tennessee River reservoir water for the Decatur area. Water hardness in Decatur measures 56 mg/L — classified as moderately soft.
Decatur's moderate softness — softer than many Tennessee Valley communities despite its Tennessee River source — reflects the Wheeler Lake reservoir's dilution of the Tennessee River supply and Decatur Utilities' treatment. The Tennessee River at Wheeler Lake above Decatur drains: the Tennessee Valley Cumberland Plateau (calcareous Mississippian and Pennsylvanian formations — calcareous contribution); the Ridge and Valley Province (calcareous Cambrian and Ordovician limestone and dolomite — soluble carbonates). However, Wheeler Lake's large reservoir volume (one of the largest TVA reservoirs) dilutes and moderates the calcareous input, and Decatur Utilities treats the supply effectively, producing the moderate 56 mg/L at the tap.
With hardness at 56 mg/L, Decatur residents enjoy relatively soft water for an Alabama Tennessee Valley community. City of Decatur Utilities Water Division consistently delivers water meeting all Alabama ADEM and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Tennessee River (Wheeler Lake) via the City of Decatur Utilities Water Division — the Tennessee Valley Wheeler Lake Reservoir (Tennessee Valley Authority reservoir) draining the Tennessee Valley Cumberland Plateau and Ridge and Valley calcareous formations; moderately soft supply at 56 mg/L — effectively softened by TVA treatment and Tennessee River reservoir dilution.