How does Kemp Mill's water compare to the national average?

The USA national average is 151 mg/L. Kemp Mill (141 mg/L) is 10 mg/L softer than average.

Kemp Mill Water Hardness & Quality Report (2026)

Water Hardness

141mg/L

Hard

8.2 grains per gallon

Source

reservoir

pH Level

8.3

neutral = 7.0

Lead

0.008 mg/L

✓ Below action level

TDS

462.9 mg/L

Est. Daily Cost

$0.38

energy & soap waste

Source: See methodology section below · Updated 2026

141mg/L as CaCO₃Hard

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 Kemp Mill, your appliances are currently losing 19% efficiency due to mineral buildup.

Appliance	In Kemp Mill	Soft Water City	Efficiency Loss
Kettle	4.9 yrs	8.5 yrs	-42%
Washing Machine	8.4 yrs	12 yrs	-30%
Water Heater	10 yrs	15 yrs	-33%

Regional Water Comparison

How Kemp Mill compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Kemp Mill, Maryland	141 mg/L	10 ppt	🟠 Hard	reservoir
White Oak, Maryland	≈ 120–179 mg/L	5.3 ppt	🟠 Hard	reservoir
Glenmont, Maryland	≈ 120–179 mg/L	7.7 ppt	🟠 Hard	reservoir
Wheaton, Maryland	≈ 120–179 mg/L	5 ppt	🟠 Hard	reservoir
Colesville, Maryland	≈ 120–179 mg/L	10 ppt	🟠 Hard	reservoir

National Benchmark

How Kemp Mill compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Kemp Mill	141 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Kemp Mill's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 462.9 mg/LpH: 8.3

Kemp Mill, Maryland, residents get their water from the Washington Suburban Sanitary Commission (WSSC). The supply is a mix of surface water, primarily from the Patuxent River, the North Branch of the Patapsco River, and Loch Raven Reservoir on the Gunpowder Falls mainstream. These sources are treated at facilities such as the Patuxent and Brighton plants before reaching homes. The water originates from the Patuxent River watershed and the Gunpowder Falls basin, both located within the Piedmont physiographic province.

The geology influencing Kemp Mill's water is characterized by ancient metamorphic and igneous rocks, including gneiss and schist formations dating back to the Precambrian and Paleozoic eras. As surface water flows through these mineral-rich terrains, it picks up dissolved minerals like calcium and magnesium. Further downstream, interactions with sedimentary layers containing limestone can enhance this mineralization, contributing to the water's characteristically hard profile. Urban runoff also adds to the dissolved solids.

This moderately hard water can lead to scale buildup in appliances like water heaters and dishwashers, potentially shortening their lifespan and reducing efficiency. You might notice white deposits on faucets and sinks, and soap may not lather as easily. To combat these effects, homeowners often find that regular appliance maintenance, such as deliming, and using vinegar rinses can help. For those experiencing significant issues with cleaning or appliance performance, installing a water softener is a recommended solution.

Geology & Source: Piedmont metamorphic and igneous rocks; gneiss and schist from Precambrian/Paleozoic eras; limestone influence; moderate to hard water

Other Maryland Water Reports

White Oak

≈ 120–179 mg/L

🟠 Hard

Glenmont

≈ 120–179 mg/L

🟠 Hard

Wheaton

≈ 120–179 mg/L

🟠 Hard

Colesville

≈ 120–179 mg/L

🟠 Hard

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

Frequently Asked Questions

Is Kemp Mill's water safe to drink?

Yes. Kemp Mill's water meets all federal safety standards. The hardness is 141 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 Kemp Mill?

At 141 mg/L (Hard), Kemp Mill'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 19%.

How does Kemp Mill compare to the USA average?

The USA national average is 151 mg/L. Kemp Mill (141 mg/L) is 10 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 Kemp Mill 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.