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

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

Baltimore Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

6.5

neutral = 7.0

Lead

0.004 mg/L

✓ Below action level

TDS

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

Appliance	In Baltimore	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 Baltimore compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Baltimore, Maryland	≈ 120–179 mg/L	19 ppt	🟠 Hard	reservoir
Canton, Maryland	≈ 120–179 mg/L	5.6 ppt	🟠 Hard	reservoir
Brooklyn Park, Maryland	≈ 120–179 mg/L	10.6 ppt	🟠 Hard	reservoir
Frankford, Maryland	≈ 0–60 mg/L	4.6 ppt	🟢 Soft	reservoir
Gwynn Oak, Maryland	≈ 120–179 mg/L	10 ppt	🟠 Hard	reservoir

National Benchmark

How Baltimore compares to the USA average

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

Local geology and source profile

Source: ReservoirTDS: 189.1 mg/LpH: 6.5

The Baltimore City Department of Public Works (DPW) manages the water supply for Baltimore City and portions of Baltimore County, Maryland. Water is sourced from three reservoirs — Loch Raven, Prettyboy, and Liberty — fed by the Gunpowder Falls and Liberty Reservoir watersheds. Treatment occurs at the Montebello Water Filtration Plants (East and West), serving approximately 1.8 million people across a 176-square-mile service area in Baltimore City and surrounding counties. These facilities employ coagulation, sedimentation, filtration, chlorination, and fluoride addition.

The primary watershed is the Gunpowder Falls basin, draining into the Chesapeake Bay region within the Piedmont physiographic province. Underlying geology includes Precambrian Baltimore Gneiss, Wissahickon Formation schists, and Paleozoic marbles and limestones. These carbonate-rich formations dissolve during precipitation and infiltration, imparting a hard character to the reservoir water through elevated calcium and magnesium mineral content, while siliceous rocks contribute to overall moderate mineralisation across the watershed.

At hard levels, expect significant limescale buildup in kettles, water heaters, and pipes, reducing efficiency and lifespan of dishwashers and washing machines. Soap scum on fixtures, spotting on glassware, and drier skin or hair are common effects. Regular vinegar descaling helps, but a water softener is recommended for households with frequent issues to extend plumbing life and improve cleaning performance. DPW reports confirm water meets EPA standards; pH is typically 7.2–7.8; lead risks persist in older homes due to century-old pipes, though the city is replacing service lines. No specific PFAS exceedances noted recently.

Geology & Source: Piedmont province — Precambrian Baltimore Gneiss, Wissahickon Formation schists, Paleozoic marbles and limestones; carbonate formations dissolve during runoff into Loch Raven, Prettyboy, and Liberty reservoirs, producing hard supply

Hardness Varies Across Baltimore — Find Your Area

City average is ≈ 120–179 mg/L. Individual ZIP areas differ.

* ZIP code estimates are derived from the city-wide measurement. Actual readings may vary slightly by neighbourhood.

ZIP Code	Neighbourhood	Hardness (mg/L)	Risk Level
21201	Downtown	≈ 148	🟠 Hard
21202	East Baltimore	≈ 149	🟠 Hard
21207	Northwest Baltimore	≈ 149	🟠 Hard
21211	Hampden	≈ 149	🟠 Hard
21216	West Baltimore	≈ 149	🟠 Hard
21205	East Baltimore	≈ 151	🟠 Hard
21206	Northeast Baltimore	≈ 151	🟠 Hard
21210	Roland Park	≈ 151	🟠 Hard
21212	Govans	≈ 151	🟠 Hard
21213	East Baltimore	≈ 151	🟠 Hard
21214	Lauraville	≈ 151	🟠 Hard
21215	Northwest Baltimore	≈ 151	🟠 Hard

Other Maryland Water Reports

Canton

≈ 120–179 mg/L

🟠 Hard

Brooklyn Park

≈ 120–179 mg/L

🟠 Hard

Frankford

≈ 0–60 mg/L

🟢 Soft

Gwynn Oak

≈ 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 Baltimore's water safe to drink?

Yes. Baltimore'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 Baltimore?

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

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