How does Adelphi's water compare to the national average?

The USA national average is 151 mg/L. Adelphi (≈ 120–179 mg/L) is 1 mg/L softer than average.

Adelphi Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

8.3

neutral = 7.0

Lead

0.008 mg/L

✓ Below action level

TDS

499.7 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

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 Adelphi, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Adelphi	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 Adelphi compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Adelphi, Maryland	≈ 120–179 mg/L	10.5 ppt	🟠 Hard	reservoir
Langley Park, Maryland	≈ 120–179 mg/L	4.7 ppt	🟠 Hard	reservoir
College Park, Maryland	≈ 120–179 mg/L	10 ppt	🟠 Hard	reservoir
White Oak, Maryland	≈ 120–179 mg/L	5.3 ppt	🟠 Hard	reservoir
Takoma Park, Maryland	≈ 120–179 mg/L	5.4 ppt	🟠 Hard	reservoir

National Benchmark

How Adelphi compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Adelphi	≈ 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 Adelphi's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 499.7 mg/LpH: 8.3

Adelphi, Maryland, gets its water from the Washington Suburban Sanitary Commission (WSSC Water). This utility draws from a mix of sources, including surface water from the Potomac River and Patuxent River, treated at the Potomac Water Treatment Plant in Potomac, MD, and the Patuxent Water Treatment Plant in Laurel, MD. Groundwater from Coastal Plain aquifers, such as the Patuxent Formation, also contributes to the supply. These sources are part of the Potomac River Basin and Patuxent River Basin.

The water's character is shaped by Coastal Plain aquifers like the Patuxent and Magothy formations. These are made up of sands, gravels, and clays with layers of limestone and shell deposits from ancient marine environments. As water moves through these formations, it dissolves minerals like calcium and magnesium from the carbonate-rich layers, leading to a supply that ranges from moderately mineralized to hard. Surface water also picks up similar ions from limestone-influenced drainage areas.

This moderately hard water can lead to scale buildup on fixtures, water heaters, and appliances like dishwashers, potentially reducing their efficiency over time. You might notice white deposits on faucets and shower stalls, and soap may not lather as easily. To manage this, homeowners often descale coffee makers and faucets with vinegar and flush water heaters annually. Many residents find that installing a water softener helps reduce scale and prolong the life of their appliances.

Geology & Source: Coastal Plain sedimentary formations; carbonate materials and shell deposits contribute calcium and magnesium, resulting in hard water

Other Maryland Water Reports

Langley Park

≈ 120–179 mg/L

🟠 Hard

College Park

≈ 120–179 mg/L

🟠 Hard

White Oak

≈ 120–179 mg/L

🟠 Hard

Takoma Park

≈ 120–179 mg/L

🟠 Hard

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Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Adelphi's water safe to drink?

Yes. Adelphi's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Adelphi?

At ≈ 120–179 mg/L (Hard), Adelphi's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Adelphi compare to the USA average?

The USA national average is 151 mg/L. Adelphi (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Adelphi is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

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.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

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.

Measured

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.

Modelled

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.

Calculated

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.