Southbridge Water Hardness & Quality Report (2026)
Water Hardness
2.5 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
77.8 mg/L
Est. Daily Cost
$0.12
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 Southbridge, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In Southbridge | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.2 yrs | 8.5 yrs | -4% |
| Washing Machine | 12 yrs | 12 yrs | — |
| Water Heater | 13.9 yrs | 15 yrs | -7% |
Regional Water Comparison
How Southbridge compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Southbridge, Massachusetts | 43.5 mg/L | 6.1 ppt | 🟢 Soft | reservoir |
| Charlton, Massachusetts | 121 mg/L | 11.5 ppt | 🟠 Hard | reservoir |
| Auburn, Massachusetts | 87 mg/L | 9.1 ppt | 🟡 Moderately Hard | reservoir |
| Killingly Center, Connecticut | 99 mg/L | 11.9 ppt | 🟡 Moderately Hard | reservoir |
| Worcester, Massachusetts | 20 mg/L | 4.5 ppt | 🟢 Soft | reservoir |
National Benchmark
How Southbridge compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Southbridge | 43.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Southbridge's Water Unique?
Local geology and source profile
Southbridge, Massachusetts, in Worcester County — a Worcester County town adjacent to Sturbridge and Charlton, in the Quinebaug River valley of south-central Massachusetts, a historic optical-manufacturing town (American Optical Company) — receives its municipal water from the Southbridge Water Division, drawing from Hamilton Reservoir or Breakneck Pond in the Quinebaug River watershed of Worcester County.
The very soft 43.5 mg/L hardness and very low TDS of 77.8 mg/L reflect the Quinebaug watershed's Connecticut Upland crystalline rock character. Hamilton Reservoir and Breakneck Pond drain the Connecticut Uplands of south Worcester County — Devonian Brimfield Schist (amphibolite and quartzite), Silurian Paxton Formation (garnet-mica schist), and the Ordovician-Cambrian metamorphic complex (all insoluble silicate metamorphic rock). The result is the very soft, very low-TDS water characteristic of the southern New England crystalline upland reservoir supply.
At 43.5 mg/L, Southbridge's water is very soft — essentially no scale forms, soap lathers abundantly, and appliances maintain excellent efficiency. Annual descaling is sufficient. The PFAS level of 6.1 ppt warrants a certified drinking water filter — the Quinebaug-Shetucket River industrial corridor (historic Worcester County textile and manufacturing PFAS legacy), the Southbridge optical manufacturing legacy (AO Company — potential PFAS from industrial coatings), and the south-central Massachusetts PFAS background contribute to Southbridge's elevated readings.
Geology & Source: Southbridge in Worcester County draws from the Southbridge Water Division on Hamilton Reservoir or Breakneck Pond (Quinebaug River watershed, Worcester County) — the Quinebaug drains the Connecticut Uplands (Devonian Brimfield Schist, Silurian Paxton Formation quartzite — insoluble silicate) — Massachusetts Connecticut Uplands crystalline silicate watershed produces very soft water at 43.5 mg/L with very low TDS 78 mg/L in this Worcester County Massachusetts town.