Langley Park Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
142.9 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 Langley Park, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Langley Park | 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 Langley Park compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Langley Park, Maryland | ≈ 120–179 mg/L | 4.7 ppt | 🟠 Hard | reservoir |
| Adelphi, Maryland | ≈ 120–179 mg/L | 10.5 ppt | 🟠 Hard | reservoir |
| Chillum, Maryland | ≈ 120–179 mg/L | 8.4 ppt | 🟠 Hard | reservoir |
| Takoma Park, Maryland | ≈ 120–179 mg/L | 5.4 ppt | 🟠 Hard | reservoir |
| Silver Spring, Maryland | ≈ 0–60 mg/L | 8.8 ppt | 🟢 Soft | reservoir |
National Benchmark
How Langley Park compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Langley Park | ≈ 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 Langley Park's Water Unique?
Local geology and source profile
Langley Park, Maryland, receives its drinking water from WSSC Water (Washington Suburban Sanitary Commission), which serves Prince George's and Montgomery Counties. Primary sources include the Potomac River, with intakes near Great Falls, supplemented by the Patuxent and Back Rivers, and groundwater from confined aquifers. Treatment occurs at major facilities including the Washington Aqueduct (Army Corps of Engineers) and WSSC's Robert A. Skinner and Ralph Bunche plants, serving over 1.8 million customers in the Washington, D.C. metro area.
The Potomac River watershed spans 14,670 square miles across four states and D.C., draining Appalachian highlands through the Piedmont into the Coastal Plain. Underlying geology features metamorphic and igneous rocks in the Piedmont transitioning to unconsolidated sands, clays, and gravels of Tertiary and Cretaceous formations. The confined Patapsco Aquifer, part of the Potomac Group, yields groundwater influenced by carbonate dissolution from limestone and dolomite, imparting a hard character to the blended supply.
Hard water in Langley Park leads to scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Faucet aerators and showerheads clog noticeably, potentially increasing energy bills by up to 20–30%. Regular vinegar descaling or installing scale-inhibiting filters is advised; a whole-house water softener is recommended for households to prevent spotting on glassware. WSSC Water reports consistent EPA compliance, with pH adjusted to 7.5–8.5; treatment involves coagulation with alum, sedimentation, filtration, and chloramination.
Geology & Source: Potomac River watershed — Piedmont Patapsco Aquifer and Patuxent Formation, Cretaceous age; Appalachian limestone and dolomite dissolve calcium and magnesium; karst-influenced geology yields characteristically hard supply
Other Maryland Water Reports
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Frequently Asked Questions
Is Langley Park's water safe to drink?
Do I need a water softener in Langley Park?
How does Langley Park compare to the USA average?
Data Sources & Methodology
Water quality data for Langley Park 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.