Cobbs Creek Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
7.9
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
282.9 mg/L
Est. Daily Cost
$0.40
energy & soap waste
Source: See methodology section below · 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 Cobbs Creek, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Cobbs Creek | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Cobbs Creek compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Cobbs Creek, Pennsylvania | ≈ 120–179 mg/L | 7.2 ppt | 🟠 Hard | reservoir |
| Kingsessing, Pennsylvania | ≈ 120–179 mg/L | 4.8 ppt | 🟠 Hard | reservoir |
| Yeadon, Pennsylvania | ≈ 120–179 mg/L | 7.2 ppt | 🟠 Hard | reservoir |
| Haddington, Pennsylvania | ≈ 120–179 mg/L | 10.5 ppt | 🟠 Hard | reservoir |
| Paschall, Pennsylvania | ≈ 120–179 mg/L | 8.3 ppt | 🟠 Hard | reservoir |
National Benchmark
How Cobbs Creek compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Cobbs Creek | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Cobbs Creek's Water Unique?
Local geology and source profile
Cobbs Creek has no dedicated municipal water utility; the stream is monitored by USGS (site 01475543 at East Lansdowne, PA) and falls within the Philadelphia Water Department's (PWD) broader service area. PWD sources potable water primarily from the Schuylkill River — via the Queen Lane, Belmont, and Queen Lane Treatment Plants — and the Delaware River via the Baxter Water Treatment Plant, serving over 2 million people across Philadelphia County and surrounding counties. No treatment plant draws directly from Cobbs Creek; nearby American Water serves the Camden, NJ area with river-sourced supply of variable hardness.
The Cobbs Creek Watershed spans urbanized areas of Philadelphia and Delaware Counties, transitioning from Piedmont to Coastal Plain geologies. Upper reaches erode across foliated gneisses and schists of the Glenarm Series (Precambrian), transitioning to Coastal Plain sands and clays downstream, with overlying Quaternary deposits including glacial till, sand, gravel, and clay from the Brandywine Formation. This mixed lithology leaches calcium and magnesium from limestone and dolomitic components of the upstream Piedmont bedrock and transported sediments, yielding a hard water character with elevated dissolved minerals.
Hard water causes moderate scale buildup in water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Soap scum forms on fixtures and laundry may appear dingy. Regular descaling of faucets and heaters is advised; a water softener is recommended for households to reduce spotting on glassware and prolong pipe life — boilers and coffee makers are particularly affected. PWD's CCR notes pH 7–8.5 for corrosion control, full lead/copper rule compliance via orthophosphate, and PFAS below MCLs post-treatment; nearby American Water reports hardness of 144–380 mg/L CaCO3.
Geology & Source: Darby-Cobbs Watershed, Lower Delaware River Basin; Precambrian Piedmont gneisses and schists (Glenarm Series) transition to Quaternary Coastal Plain sands; calcium and magnesium leaching yields hard supply
Other Pennsylvania Water Reports
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Frequently Asked Questions
Is Cobbs Creek's water safe to drink?
Do I need a water softener in Cobbs Creek?
How does Cobbs Creek compare to the USA average?
Data Sources & Methodology
Water quality data for Cobbs Creek is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.