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

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

Bethesda Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

groundwater

pH Level

neutral = 7.0

Lead

0.005 mg/L

✓ Below action level

TDS

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

Appliance	In Bethesda	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 Bethesda compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Bethesda, Maryland	≈ 120–179 mg/L	7.9 ppt	🟠 Hard	groundwater
Van Ness, District of Columbia	≈ 120–179 mg/L	7.5 ppt	🟠 Hard	river
North Bethesda, Maryland	134 mg/L	7.2 ppt	🟠 Hard	reservoir
Colorado Triangle, District of Columbia	≈ 120–179 mg/L	7.5 ppt	🟠 Hard	river
Wheaton, Maryland	≈ 120–179 mg/L	5 ppt	🟠 Hard	reservoir

National Benchmark

How Bethesda compares to the USA average

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

Local geology and source profile

Source: GroundwaterTDS: 312.8 mg/LpH: 8

Bethesda, Maryland receives its drinking water from the Washington Suburban Sanitary Commission (WSSC Water), serving Montgomery County and surrounding areas. The primary sources are the Potomac River and Patuxent River, treated at the Potomac Water Filtration Plant in Potomac, Maryland, and the Patuxent Water Filtration Plant in Laurel, Maryland. WSSC Water conducts over 500,000 tests annually, with results summarized in Consumer Confidence Reports available on their website.

The Potomac and Patuxent Rivers drain expansive watersheds in the Mid-Atlantic region, crossing the Fall Line from the Piedmont into the Coastal Plain. In the Coastal Plain, water interacts with Cretaceous and Tertiary sedimentary rock formations, including unconsolidated sands, clays, and carbonate-rich shell deposits featuring calcite, aragonite, and magnesium calcite. These geological features dissolve calcium and magnesium through natural leaching, resulting in a hard supply with elevated mineral content.

Hard water promotes scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan while increasing energy costs. Soap lathering is reduced, leading to higher detergent use and potential skin dryness; regular deliming of appliances and flushing systems is advised. A water softener is recommended to protect plumbing. WSSC Water meets federal standards for pH, lead, and copper, with corrosion control and fluoridation in place; past reports have noted detections of hexavalent chromium above some health guidelines.

Geology & Source: Potomac River and Patuxent River watersheds in Maryland Coastal Plain; Cretaceous and Tertiary carbonate-rich sedimentary formations — calcite, aragonite, shell deposits — dissolve calcium and magnesium, producing hard supply

Other Maryland Water Reports

Van Ness

≈ 120–179 mg/L

🟠 Hard

North Bethesda

134 mg/L

🟠 Hard

Colorado Triangle

≈ 120–179 mg/L

🟠 Hard

Wheaton

≈ 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 Bethesda's water safe to drink?

Yes. Bethesda'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 Bethesda?

At ≈ 120–179 mg/L (Hard), Bethesda'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 Bethesda compare to the USA average?

The USA national average is 151 mg/L. Bethesda (≈ 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 Bethesda 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.