Glassmanor 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
0.005 mg/L
✓ Below action level
TDS
284.4 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 Glassmanor, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Glassmanor | 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 Glassmanor compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Glassmanor, Maryland | ≈ 120–179 mg/L | 7.4 ppt | 🟠 Hard | reservoir |
| Oxon Hill, Maryland | ≈ 120–179 mg/L | 9.7 ppt | 🟠 Hard | reservoir |
| Oxon Hill-Glassmanor, Maryland | ≈ 120–179 mg/L | 5.9 ppt | 🟠 Hard | reservoir |
| Hillcrest Heights, Maryland | ≈ 120–179 mg/L | 5.6 ppt | 🟠 Hard | reservoir |
| Anacostia, District of Columbia | ≈ 120–179 mg/L | 8.3 ppt | 🟠 Hard | river |
National Benchmark
How Glassmanor compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Glassmanor | ≈ 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 Glassmanor's Water Unique?
Local geology and source profile
WSSC Water (Washington Suburban Sanitary Commission) serves Glassmanor in Oxon Hill, Prince George's County, Maryland, providing water to over 1.8 million people across Montgomery and Prince George's counties. Primary sources include the Potomac River (surface water via intake at Great Falls), supplemented by the Patuxent River, and groundwater from Coastal Plain aquifers. Treatment occurs at major facilities including the Washington Aqueduct (U.S. Army Corps of Engineers partnership) and WSSC's Robert A. Skinner Water Filtration Plant, with distribution through an extensive piped network.
The Potomac River watershed spans the Appalachian Piedmont into the Atlantic Coastal Plain, with Glassmanor's supply shaped by limestone, marl, and shell deposits in Cretaceous and Tertiary sedimentary formations. Coastal Plain aquifers, rich in carbonate minerals from ancient marine shells — including calcite, aragonite, and magnesium calcite — impart a moderately mineralised character to groundwater components. Surface water picks up calcium and magnesium ions from upstream sedimentary rocks, blending to form an overall moderately hard supply typical of the region.
Moderately hard water promotes moderate scale buildup on fixtures, water heaters (up to 15–20% energy loss), washing machines, and dishwashers, reducing efficiency and lifespan. Regular vinegar descaling, installing sediment filters, and flushing hot water tanks annually are recommended. A water softener is recommended for optimal performance and to minimize soap use. WSSC Water maintains pH 7.2–8.0 for corrosion control, with full lead and copper rule compliance and no PFAS exceedances post-treatment; treatment includes coagulation with alum, sedimentation, dual-media filtration, chloramination, and fluoride addition.
Geology & Source: Coastal Plain marine-origin aquifers — calcite, aragonite, magnesium calcite from weathered shells; Potomac River watershed over Piedmont limestone and Cretaceous sedimentary rocks; moderate hardness from dissolved calcium and magnesium
Other Maryland Water Reports
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Frequently Asked Questions
Is Glassmanor's water safe to drink?
Do I need a water softener in Glassmanor?
How does Glassmanor compare to the USA average?
Data Sources & Methodology
Water quality data for Glassmanor 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.