King of Prussia Water Hardness & Quality Report (2026)
Water Hardness
5.3 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
141.4 mg/L
Est. Daily Cost
$0.24
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 King of Prussia, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In King of Prussia | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.6 yrs | 8.5 yrs | -22% |
| Washing Machine | 10.2 yrs | 12 yrs | -15% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How King of Prussia compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ King of Prussia, Pennsylvania | 91 mg/L | 4.5 ppt | 🟡 Moderately Hard | reservoir |
| West Norriton, Pennsylvania | 195 mg/L | 10 ppt | 🔴 Very Hard | reservoir |
| Wayne, Pennsylvania | 165.5 mg/L | 8.5 ppt | 🟠 Hard | reservoir |
| Radnor, Pennsylvania | 141 mg/L | 7.2 ppt | 🟠 Hard | reservoir |
| Norristown, Pennsylvania | 203.5 mg/L | 10.5 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How King of Prussia compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ King of Prussia | 91 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes King of Prussia's Water Unique?
Local geology and source profile
King of Prussia, Pennsylvania, in Montgomery County — one of the largest suburban retail and commercial centers in the United States, home of the King of Prussia Mall (the largest shopping mall on the East Coast), a major pharmaceutical and biotechnology corporate campus community in the Philadelphia western suburbs — receives its municipal water from the Chester Valley Water Authority or Aqua Pennsylvania, which draws from reservoirs in the Valley Forge-Montgomery County corridor or from the Schuylkill River system.
The moderately soft 91 mg/L hardness and TDS of 141.4 mg/L are softer than Philadelphia's Schuylkill-Delaware supply (204 mg/L) — reflecting the more upstream Schuylkill watershed character at the Valley Forge-Montgomery County level. At this point, the Schuylkill drainage is more strongly influenced by the soft Blue Ridge crystalline and the Reading Prong metamorphic terrain (Precambrian gneiss and quartzite — soft) upstream, with less of the carbonate-loading Valley and Ridge contribution that dominates the lower Schuylkill at Philadelphia.
At 91 mg/L, King of Prussia's water is moderately soft — comfortable for household use. Scale forms slowly over months, soap lathers well, and appliances operate efficiently. Semi-annual descaling is adequate. The PFAS level of 4.5 ppt warrants a certified drinking water filter — the Naval Air Station Willow Grove (former — now Horsham Air Guard Station, adjacent to King of Prussia in the Montgomery County corridor), and the Montgomery County pharmaceutical-defense industrial corridor contribute to the PFAS background.
Geology & Source: King of Prussia in Montgomery County draws from the Chester Valley Water Authority or Aqua Pennsylvania on Valley Forge area reservoirs or the Schuylkill River — the Schuylkill watershed drains the Pennsylvania Piedmont (Triassic and Cambrian calcareous terrain) and the Reading Prong — Triassic calcareous and Cambrian metamorphic watershed produces moderately soft water at 91 mg/L with TDS 141 mg/L in this Montgomery County Pennsylvania community.