Germantown Water Hardness & Quality Report (2026)
Water Hardness
10.8 grains per gallon
Source
groundwater
pH Level
8.1
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
521.6 mg/L
Est. Daily Cost
$0.49
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 Germantown, your appliances are currently losing 25% efficiency due to mineral buildup.
| Appliance | In Germantown | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.5 yrs | 8.5 yrs | -59% |
| Washing Machine | 6.8 yrs | 12 yrs | -43% |
| Water Heater | 8.2 yrs | 15 yrs | -45% |
Regional Water Comparison
How Germantown compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Germantown, Wisconsin | 184.5 mg/L | 5 ppt | 🔴 Very Hard | groundwater |
| Menomonee Falls, Wisconsin | 236.5 mg/L | 6.2 ppt | 🔴 Very Hard | groundwater |
| Mequon, Wisconsin | 238 mg/L | 6.3 ppt | 🔴 Very Hard | groundwater |
| Brookfield, Wisconsin | 212 mg/L | 5.7 ppt | 🔴 Very Hard | groundwater |
| Glendale, Wisconsin | 198.5 mg/L | 5.4 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Germantown compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Germantown | 184.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Germantown's Water Unique?
Local geology and source profile
Germantown, Wisconsin, in Washington County — a Washington County village in the Milwaukee-metropolitan outer-ring northwest suburbs, adjacent to Menomonee Falls and Brookfield in the Milwaukee western suburban corridor — receives its municipal water from the Village of Germantown Water Department, which draws from deep bedrock aquifer wells in the Silurian dolomite of Washington County.
The moderately hard 184.5 mg/L hardness and elevated TDS of 521.6 mg/L reflect the Washington County Silurian dolomite groundwater supply. The Silurian Niagara Dolomite in Washington County forms part of the Niagara Escarpment's western face — the same thick dolomite sequence that extends from Niagara Falls across the Michigan Basin through Wisconsin. Deep wells in this dolomite produce the characteristically hard water common to inland Wisconsin communities that do not draw from Lake Michigan. The elevated TDS reflects calcium, magnesium bicarbonate, and some sulfate from gypsite dissolution in the Silurian succession.
At 184.5 mg/L, Germantown'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 5.0 ppt warrants a certified drinking water filter — the Milwaukee industrial corridor, the Washington County manufacturing belt, and the Wisconsin Army National Guard training areas contribute to the area's PFAS background.
Geology & Source: Germantown in Washington County draws from Germantown Water Utilities on the Silurian dolomite aquifer (deep bedrock wells, Washington County) — the Washington County bedrock aquifer accesses Silurian Niagara Dolomite and Maquoketa Shale transition of the Wisconsin carbonate platform — Great Lakes Silurian dolomite bedrock aquifer produces moderately hard water at 184.5 mg/L with elevated TDS 522 mg/L in this Washington County Wisconsin village.