Mountain Brook Water Hardness & Quality Report (2026)
Water Hardness
10.2 grains per gallon
Source
reservoir
pH Level
8.2
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
454.5 mg/L
Est. Daily Cost
$0.46
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 Mountain Brook, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Mountain Brook | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.9 yrs | 8.5 yrs | -54% |
| Washing Machine | 7.2 yrs | 12 yrs | -40% |
| Water Heater | 8.6 yrs | 15 yrs | -43% |
Regional Water Comparison
How Mountain Brook compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mountain Brook, Alabama | 174 mg/L | 8.2 ppt | 🟠 Hard | reservoir |
| Birmingham, Alabama | 157.5 mg/L | 7.6 ppt | 🟠 Hard | reservoir |
| Homewood, Alabama | 150.5 mg/L | 7.3 ppt | 🟠 Hard | reservoir |
| Irondale, Alabama | 77 mg/L | 4.7 ppt | 🟡 Moderately Hard | reservoir |
| Vestavia Hills, Alabama | 98.5 mg/L | 5.5 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Mountain Brook compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mountain Brook | 174 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mountain Brook's Water Unique?
Local geology and source profile
Mountain Brook, Alabama, in Jefferson County — one of the wealthiest municipalities in Alabama, a prestigious Jefferson County suburb of Birmingham known as The Tiny Kingdom, surrounded by the wealthy Over the Mountain communities (Homewood, Vestavia Hills) — receives its municipal water from the Birmingham Water Works Board (BWWB), which draws from Lake Purdy (on the Little Cahaba River east of Birmingham) and the Cahaba River through the BWWB treatment system serving the greater Birmingham metropolitan area.
The moderately hard 174 mg/L hardness and elevated TDS of 454.5 mg/L reflect the Cahaba River watershed's Alabama Valley and Ridge geology. The Cahaba River drains the Birmingham-Bessemer Valley and Ridge — the Pennsylvanian Pottsville Formation (sandstone, shale, and coal) and the underlying Mississippian limestone (Bangor Limestone, Monteagle Limestone, Tuscumbia Limestone — the prolific Alabama carbonate sequence). The Cahaba basin also accesses the Ordovician and Cambrian carbonate formations of the Alabama Valley and Ridge province. Birmingham sits in the coal and iron ore belt where Carboniferous marine limestone forms the primary bedrock, contributing moderate hardness to the Cahaba watershed.
At 174 mg/L, Mountain Brook's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and bathroom fixtures develop calcium deposits. Quarterly descaling is appropriate. The PFAS level of 8.2 ppt warrants a certified drinking water filter — the Birmingham metro's heavy industrial legacy (steel, iron, coke oven operations), the Redstone Arsenal (Huntsville-Madison County AFFF sources in the Cahaba-Tennessee watershed), and the Anniston Army Depot (historical chemical weapons site in the Cahaba watershed region) all contribute to Jefferson County's elevated PFAS readings.
Geology & Source: Mountain Brook in Jefferson County draws from the Birmingham Water Works (BWWB) treating Lake Purdy and the Cahaba River — the Cahaba River headwaters drain the Valley and Ridge (Pennsylvanian and Mississippian limestone and shale of the Birmingham-Bessemer anticlinorium) — Valley and Ridge Carboniferous carbonate drainage produces moderately hard water at 174 mg/L with elevated TDS 455 mg/L in this Jefferson County Alabama city.