Back Bay Water Hardness & Quality Report (2026)
Water Hardness
5.3 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
213 mg/L
Est. Daily Cost
$0.24
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
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 Back Bay, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Back Bay | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.6 yrs | 8.5 yrs | -22% |
| Washing Machine | 10.2 yrs | 12 yrs | -15% |
| Water Heater | 11.9 yrs | 15 yrs | -21% |
Regional Water Comparison
How Back Bay compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Back Bay, Massachusetts | 91.5 mg/L | 9.5 ppt | 🟡 Moderately Hard | reservoir |
| Fenway/Kenmore, Massachusetts | 109 mg/L | 10.7 ppt | 🟡 Moderately Hard | reservoir |
| East Cambridge, Massachusetts | 119 mg/L | 11.4 ppt | 🟡 Moderately Hard | reservoir |
| Cambridgeport, Massachusetts | 87 mg/L | 9.2 ppt | 🟡 Moderately Hard | reservoir |
| Roxbury Crossing, Massachusetts | 49.5 mg/L | 6.5 ppt | 🟢 Soft | reservoir |
National Benchmark
How Back Bay compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Back Bay | 91.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Back Bay's Water Unique?
Local geology and source profile
Back Bay, Massachusetts, in Suffolk County — a Suffolk County neighborhood in central Boston adjacent to Beacon Hill and South End, an iconic Boston Victorian brownstone district built on landfill in the former Back Bay tidal estuary — receives its municipal water from the Massachusetts Water Resources Authority (MWRA), drawing from the Quabbin Reservoir and Wachusett Reservoir (central Massachusetts) through the MWRA distribution system.
The moderately soft 91.5 mg/L hardness and TDS of 213 mg/L are slightly harder than typical MWRA readings (most MWRA: 40-80 mg/L), reflecting the older Back Bay distribution infrastructure — the historic Victorian-era water mains and the back-bay landfill groundwater contact may contribute mineral leaching. The MWRA Quabbin supply drains Precambrian Ware Gneiss (insoluble crystalline), inherently producing very soft water before distribution.
At 91.5 mg/L, Back Bay's water is moderately soft — light scale may form in appliances over time, but dishwashers and water heaters remain efficient. Semi-annual descaling is sufficient. The PFAS level of 9.5 ppt warrants a certified reverse osmosis drinking water filter — Logan International Airport (East Boston — AFFF, in the Boston Harbor drainage), the South Boston industrial waterfront, and the Greater Boston PFAS complex contribute to Back Bay's very elevated readings.
Geology & Source: Back Bay in Suffolk County draws from Massachusetts Water Resources Authority on the Quabbin Reservoir (central Massachusetts MWRA supply) — the Quabbin drains the Central Massachusetts Upland (Precambrian Ware Gneiss, Devonian Millers River Formation — insoluble crystalline) — Massachusetts MWRA Quabbin Precambrian crystalline watershed produces moderately soft water at 91.5 mg/L with TDS 213 mg/L in this Suffolk County Massachusetts neighborhood.