Carlisle Water Hardness & Quality Report (2026)
Water Hardness
4.9 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
128 mg/L
Est. Daily Cost
$0.23
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 Carlisle, your appliances are currently losing 11% efficiency due to mineral buildup.
| Appliance | In Carlisle | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 10.5 yrs | 12 yrs | -13% |
| Water Heater | 12.2 yrs | 15 yrs | -19% |
Regional Water Comparison
How Carlisle compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Carlisle, Pennsylvania | 84.5 mg/L | 4.3 ppt | 🟡 Moderately Hard | reservoir |
| Harrisburg, Pennsylvania | 177.5 mg/L | 9.2 ppt | 🟠 Hard | reservoir |
| Colonial Park, Pennsylvania | 178.5 mg/L | 9.2 ppt | 🟠 Hard | reservoir |
| Weigelstown, Pennsylvania | 122.5 mg/L | 6.3 ppt | 🟠 Hard | reservoir |
| Hanover, Pennsylvania | 204 mg/L | 10.6 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How Carlisle compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Carlisle | 84.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Carlisle's Water Unique?
Local geology and source profile
Carlisle, Pennsylvania, in Cumberland County — the Cumberland County seat adjacent to Mechanicsburg and Shippensburg, home of Dickinson College and the US Army War College at Carlisle Barracks — receives its municipal water from the Carlisle Area Water Authority, drawing from local reservoirs or Yellow Breeches Creek on the South Mountain in Cumberland County.
The moderately soft 84.5 mg/L hardness and low TDS of 128.0 mg/L reflect the South Mountain and Cumberland Valley watershed character. Yellow Breeches Creek drains the South Mountain — the southern extension of the Blue Ridge (Precambrian Catoctin Formation metavolcanic, Cambrian Harpers Formation quartzite) — all insoluble silicate rock. This soft South Mountain crystalline drainage contrasts with the surrounding Cumberland Valley limestone aquifer (Great Valley — highly calcareous), and Carlisle's soft supply reflects that its primary source is the South Mountain reservoir system rather than the local Great Valley limestone groundwater.
At 84.5 mg/L, Carlisle's water is moderately soft — comfortable for household use. Scale forms slowly, soap lathers well, and appliances operate efficiently. Semi-annual descaling is adequate. The PFAS level of 4.3 ppt warrants a certified drinking water filter — Carlisle Barracks (US Army War College — AFFF user in the Yellow Breeches watershed), the Cumberland Valley industrial corridor, and the south-central Pennsylvania PFAS background contribute to Carlisle's readings.
Geology & Source: Carlisle in Cumberland County draws from the Carlisle Area Water Authority on Yellow Breeches Creek (South Mountain reservoir, Cumberland County) — Yellow Breeches drains the South Mountain (Precambrian Catoctin Formation metavolcanic and Cambrian Harpers Formation quartzite — insoluble silicate) — Pennsylvania South Mountain crystalline silicate watershed produces moderately soft water at 84.5 mg/L with TDS 128 mg/L in this Cumberland County Pennsylvania city.