Radnor Water Hardness & Quality Report (2026)
Water Hardness
8.2 grains per gallon
Source
reservoir
pH Level
7.9
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
281.4 mg/L
Est. Daily Cost
$0.38
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 Radnor, your appliances are currently losing 19% efficiency due to mineral buildup.
| Appliance | In Radnor | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.9 yrs | 8.5 yrs | -42% |
| Washing Machine | 8.4 yrs | 12 yrs | -30% |
| Water Heater | 10 yrs | 15 yrs | -33% |
Regional Water Comparison
How Radnor compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Radnor, Pennsylvania | 141 mg/L | 7.2 ppt | 🟠 Hard | reservoir |
| Wayne, Pennsylvania | 165.5 mg/L | 8.5 ppt | 🟠 Hard | reservoir |
| King of Prussia, Pennsylvania | 91 mg/L | 4.5 ppt | 🟡 Moderately Hard | reservoir |
| Norristown, Pennsylvania | 203.5 mg/L | 10.5 ppt | 🔴 Very Hard | reservoir |
| Havertown, Pennsylvania | 208 mg/L | 10.7 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How Radnor compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Radnor | 141 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Radnor's Water Unique?
Local geology and source profile
Radnor, Pennsylvania, in Delaware County — a major Philadelphia Main Line community (Radnor Township is one of the most affluent and prestigious communities on the Philadelphia Main Line — a Delaware County township encompassing the villages of Wayne, St. Davids, Villanova, and Rosemont; Radnor is home of Villanova University (a prominent Catholic Augustinian research university — one of the most distinguished universities on the Philadelphia Main Line, particularly noted for its law school, business school, and NCAA basketball program that won national championships), a diverse Delaware County community with a primarily affluent professional, academic, and old-money Philadelphia population, home of several major corporate headquarters, and adjacent to the Valley Forge corridor — draws its municipal water supply via Aqua Pennsylvania. Water hardness in Radnor measures 141 mg/L — classified as moderately hard.
Radnor's moderate hardness reflects the Main Line Delaware County Piedmont watershed geology. The Aqua PA system draws from the Schuylkill River watershed draining the Precambrian Wissahickon Schist (calcareous-moderate) in the Main Line foothills, producing the moderate 141 mg/L.
At 141 mg/L, Radnor residents encounter moderate scale accumulation. Monthly cleaning is recommended. Aqua Pennsylvania consistently delivers water meeting all Pennsylvania DEP and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from the Schuylkill River watershed via the Aqua Pennsylvania (Aqua PA) — the Delaware County Main Line Philadelphia suburban Radnor corridor (Precambrian calcareous-moderate Wissahickon Schist and Philadelphia Gneiss — the calcareous-moderate northwest Philadelphia Main Line Piedmont watershed; Aqua PA Main Line distribution to Radnor zone); moderately hard supply at 141 mg/L in Delaware County.