New Carrollton Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.8

neutral = 7.0

Lead

0.004 mg/L

✓ Below action level

TDS

238.5 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 New Carrollton, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In New Carrollton	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 New Carrollton compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ New Carrollton, Maryland	≈ 120–179 mg/L	6.6 ppt	🟠 Hard	reservoir
Lanham, Maryland	≈ 120–179 mg/L	4.7 ppt	🟠 Hard	reservoir
Lanham-Seabrook, Maryland	≈ 120–179 mg/L	7 ppt	🟠 Hard	reservoir
Seabrook, Maryland	≈ 120–179 mg/L	7.4 ppt	🟠 Hard	reservoir
East Riverdale, Maryland	≈ 120–179 mg/L	8.3 ppt	🟠 Hard	reservoir

National Benchmark

How New Carrollton compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ New Carrollton	≈ 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 New Carrollton's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 238.5 mg/LpH: 7.8

New Carrollton, Maryland, gets its water from WSSC Water, a utility serving Prince George's County and nearby areas. The water comes from the Potomac River and the Patuxent River, which are treated at facilities like the Patuxent Water Treatment Plant in Laurel, MD, and the Potomac Water Treatment Plant in Rockville, MD. This supply serves over 1.8 million people across a vast area, drawing from the Potomac River Basin and Patuxent River Watershed.

The region's geology, particularly the Potomac Group formations and coastal plain sediments, plays a key role. These layers, rich with limestone and dolomite fragments, readily dissolve minerals like calcium and magnesium. This process, common in the transition zone between Maryland's Piedmont and Atlantic Coastal Plain, results in a naturally hard water supply due to prolonged contact with these sedimentary rocks.

Homeowners in New Carrollton often notice scale buildup on pipes, inside water heaters, and in appliances such as dishwashers and washing machines. This mineral accumulation can decrease efficiency and shorten the lifespan of these devices. You might also find that laundry detergents and soaps don't lather as well. Regularly descaling with vinegar, flushing your water heater annually, or installing a scale inhibitor can help manage these effects. For a more comprehensive solution, a water softener is often recommended to protect your appliances and improve cleaning.

Geology & Source: Patuxent River watershed and Potomac River Group aquifers; Cretaceous sands, clays, limestone, and dolomite fragments dissolve calcium and magnesium carbonates, yielding hard water.

Other Maryland Water Reports

Lanham

≈ 120–179 mg/L

🟠 Hard

Lanham-Seabrook

≈ 120–179 mg/L

🟠 Hard

Seabrook

≈ 120–179 mg/L

🟠 Hard

East Riverdale

≈ 120–179 mg/L

🟠 Hard

Report an Issue

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 New Carrollton's water safe to drink?

Yes. New Carrollton'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 New Carrollton?

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

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