How does Chestnut Hill's water compare to the national average?

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

Chestnut Hill Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

reservoir

pH Level

7.1

neutral = 7.0

Lead

0.001 mg/L

✓ Below action level

TDS

29.6 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 Chestnut Hill, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Chestnut Hill	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 Chestnut Hill compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Chestnut Hill, Massachusetts	≈ 0–59 mg/L	4.5 ppt	🟢 Soft	reservoir
Brighton, Massachusetts	≈ 0–60 mg/L	7.3 ppt	🟢 Soft	reservoir
Newtonville, Massachusetts	≈ 0–60 mg/L	0 ppt	🟢 Soft	reservoir
Newton, Massachusetts	≈ 0–60 mg/L	0 ppt	🟢 Soft	reservoir
Watertown, Massachusetts	≈ 0–60 mg/L	0 ppt	🟢 Soft	reservoir

National Benchmark

How Chestnut Hill compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Chestnut Hill	≈ 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 Chestnut Hill's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 29.6 mg/LpH: 7.1

Chestnut Hill, Massachusetts is served by the Massachusetts Water Resources Authority (MWRA), a regional utility providing drinking water to greater Boston and surrounding communities. The primary sources are the Quabbin and Wachusett Reservoirs in central Massachusetts. Raw water is treated at the John J. Carroll Water Treatment Plant in Marlborough, MA, before distribution through the MWRA transmission system to Chestnut Hill and other service areas in Norfolk and Suffolk Counties.

The Quabbin–Wachusett watershed drains a region dominated by metamorphic and igneous bedrock of the New England Upland, including Cambrian–Ordovician schists and granites. These rocks are relatively resistant to weathering and contain limited carbonate minerals, so water draining through this terrain picks up only small amounts of dissolved calcium and magnesium. As a result, the supply is very soft and low in mineral content.

With a soft water supply, Chestnut Hill residents experience minimal scale buildup in pipes, water heaters, dishwashers, and coffee makers. Soap lathers easily and detergents are effective at lower doses; water softeners are unnecessary and may increase sodium levels without benefit. Regular flushing of water heaters and checking older plumbing for minor corrosion are sufficient maintenance measures. MWRA's annual water quality reports confirm compliance with all federal and state standards; treatment includes coagulation, sedimentation, filtration, and disinfection, with lead, copper, and PFAS levels within compliance limits.

Geology & Source: Quabbin and Wachusett Reservoirs drain Cambrian–Ordovician schists and granites of the New England Upland; low carbonate minerals in metamorphic and igneous bedrock produce very soft water

Other Massachusetts Water Reports

Brighton

≈ 0–60 mg/L

🟢 Soft

Newtonville

≈ 0–60 mg/L

🟢 Soft

Newton

≈ 0–60 mg/L

🟢 Soft

Watertown

≈ 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 Chestnut Hill's water safe to drink?

Yes. Chestnut Hill'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 Chestnut Hill?

Chestnut Hill'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 Chestnut Hill compare to the USA average?

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