Mashpee Water Hardness & Quality Report (2026)
Water Hardness
1.2 grains per gallon
Source
reservoir
pH Level
7.1
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
31.3 mg/L
Est. Daily Cost
$0.05
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 Mashpee, your appliances are currently losing 3% efficiency due to mineral buildup.
| Appliance | In Mashpee | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.9 yrs | 8.5 yrs | — |
| Washing Machine | 12.8 yrs | 12 yrs | — |
| Water Heater | 14.8 yrs | 15 yrs | -1% |
Regional Water Comparison
How Mashpee compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mashpee, Massachusetts | 20.5 mg/L | 4.5 ppt | 🟢 Soft | reservoir |
| Barnstable, Massachusetts | 101.5 mg/L | 10.2 ppt | 🟡 Moderately Hard | reservoir |
| Hyannis, Massachusetts | 105.5 mg/L | 10.4 ppt | 🟡 Moderately Hard | reservoir |
| Yarmouth, Massachusetts | 26 mg/L | 4.9 ppt | 🟢 Soft | reservoir |
| Harwich, Massachusetts | 56.5 mg/L | 7 ppt | 🟢 Soft | reservoir |
National Benchmark
How Mashpee compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mashpee | 20.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Mashpee home
Shop water softeners on Amazon.com →
What Makes Mashpee's Water Unique?
Local geology and source profile
Mashpee, Massachusetts, in Barnstable County — a Barnstable County town adjacent to Falmouth and Barnstable on Cape Cod in southeast Massachusetts — receives its water from the Mashpee Water Division, drawing from the Cape Cod Aquifer (Barnstable County) through the Cape Cod distribution.
The very soft 20.5 mg/L hardness and very low TDS of 31.3 mg/L reflect the Cape Cod Aquifer's nearly pure glacial outwash character — the softest supply in the entire Massachusetts dataset and among the softest in the USA. The Cape Cod Aquifer at Barnstable County is developed in Pleistocene glacial outwash (nearly insoluble — derived from New England Precambrian granite and gneiss transported by the Laurentide Ice Sheet, the dominant primary supply), Pleistocene morainic outwash sand and gravel (insoluble), and minor Cretaceous coastal plain sand (insoluble). The entirely insoluble Pleistocene outwash produces the very soft Cape Cod supply.
At 20.5 mg/L, Mashpee'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 4.5 ppt warrants a certified drinking water filter — Joint Base Cape Cod (Barnstable County — AFFF, the primary Cape Cod PFAS source, directly adjacent to the Cape Cod Aquifer) and the Camp Edwards military training area PFAS plume contribute to Mashpee's readings.
Geology & Source: Mashpee in Barnstable County draws from the Mashpee Water Division on the Cape Cod Aquifer (Barnstable County, Cape Cod Massachusetts) — the Cape Cod Aquifer at Barnstable is developed in Pleistocene glacial outwash (nearly insoluble, from New England Precambrian crystalline) — Massachusetts Barnstable County Cape Cod Pleistocene outwash aquifer produces very soft water at 20.5 mg/L with TDS 31.3 mg/L.