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

The USA national average is 151 mg/L. Boston (≈ 0–59 mg/L) is 121 mg/L softer than average.

Boston Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

reservoir

pH Level

7.3

neutral = 7.0

Lead

0.006 mg/L

✓ Below action level

TDS

77.9 mg/L

Est. Daily Cost

$0.08

energy & soap waste

Source: See methodology section below · Updated 2026

soft~0–59 mg/LSoft · 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 Boston, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Boston	Soft Water City	Efficiency Loss
Kettle	8.2 yrs	8.5 yrs	-4%
Washing Machine	11.5 yrs	12 yrs	-4%
Water Heater	14.4 yrs	15 yrs	-4%

Regional Water Comparison

How Boston compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Boston, Massachusetts	≈ 0–59 mg/L	10 ppt	🟢 Soft	reservoir
North End, Massachusetts	≈ 0–60 mg/L	11.2 ppt	🟢 Soft	reservoir
Charlestown, Massachusetts	≈ 0–60 mg/L	11.5 ppt	🟢 Soft	reservoir
East Cambridge, Massachusetts	60 mg/L	11.4 ppt	🟡 Moderately Hard	reservoir
East Boston, Massachusetts	≈ 0–60 mg/L	11.2 ppt	🟢 Soft	groundwater

National Benchmark

How Boston compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Boston	≈ 0–59 mg/L	🟢 None
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Boston's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 77.9 mg/LpH: 7.3

The Massachusetts Water Resources Authority (MWRA) supplies drinking water to Boston and 41 other communities in the greater Boston and Metro West region, serving a large metropolitan area across several counties. Water is sourced from two major reservoirs: Quabbin Reservoir and Wachusett Reservoir, both located in central and western Massachusetts. The MWRA operates a network of treatment plants, transmission mains, and distribution infrastructure to deliver water meeting all EPA drinking water standards, publishing annual Consumer Confidence Reports detailing quality parameters and any detected contaminants.

Boston's water supply originates in the Quabbin and Wachusett watersheds, draining areas underlain by Precambrian metamorphic bedrock — including gneiss and schist — overlain by glacial deposits from the last ice age. These ancient, chemically stable rock formations contribute minimal dissolved minerals to the water, as their resistant composition limits calcium and magnesium leaching. The watershed geology naturally produces a soft water supply with very low concentrations of hardness-forming ions, reflecting minimal interaction with soluble carbonate or evaporite formations.

Soft water means Boston residents experience minimal scaling on fixtures and appliances, reduced soap and detergent consumption, and no need for water softening in most households. Dishwashers and washing machines operate without mineral buildup, and glassware stays spot-free. The MWRA adjusts treated water to a pH of approximately 9.0–9.5 to reduce corrosion and metal leaching from household plumbing; untreated raw water in Quabbin Reservoir registers a near-neutral pH of approximately 6.8. All EPA drinking water standards are met and compliance is confirmed through annual reporting.

Geology & Source: Quabbin and Wachusett reservoir watersheds; Precambrian metamorphic bedrock — gneiss and schist overlain by glacial deposits; chemically resistant rocks contribute minimal calcium and magnesium, producing soft water

Hardness Varies Across Boston — Find Your Area

City average is ≈ 0–59 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
02110	Downtown / Waterfront	≈ 29	🟢 Soft
02127	South Boston	≈ 29	🟢 Soft
02108	Beacon Hill	≈ 30	🟢 Soft
02109	North End	≈ 30	🟢 Soft
02111	Chinatown / Leather District	≈ 30	🟢 Soft
02116	Back Bay	≈ 30	🟢 Soft
02115	Fenway / Longwood	≈ 30	🟢 Soft
02118	South End	≈ 30	🟢 Soft
02120	Mission Hill	≈ 30	🟢 Soft
02121	Dorchester	≈ 30	🟢 Soft
02119	Roxbury	≈ 31	🟢 Soft
02125	Dorchester South	≈ 31	🟢 Soft

Other Massachusetts Water Reports

North End

≈ 0–60 mg/L

🟢 Soft

Charlestown

≈ 0–60 mg/L

🟢 Soft

East Cambridge

60 mg/L

🟡 Moderately Hard

East Boston

≈ 0–60 mg/L

🟢 Soft

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 Boston's water safe to drink?

Yes. Boston's water meets all federal safety standards. The hardness is ≈ 0–59 mg/L (Soft), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Boston?

Boston's water is soft at ≈ 0–59 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Boston compare to the USA average?

The USA national average is 151 mg/L. Boston (≈ 0–59 mg/L) is 121 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 Boston 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.