Windham Water Hardness & Quality Report (2026)
Water Hardness
3.9 grains per gallon
Source
reservoir
pH Level
7.6
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
159.3 mg/L
Est. Daily Cost
$0.18
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 Windham, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Windham | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.4 yrs | 8.5 yrs | -13% |
| Washing Machine | 11.1 yrs | 12 yrs | -8% |
| Water Heater | 12.9 yrs | 15 yrs | -14% |
Regional Water Comparison
How Windham compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Windham, New Hampshire | 66.5 mg/L | 7.7 ppt | 🟡 Moderately Hard | reservoir |
| Pelham, New Hampshire | 29 mg/L | 4.7 ppt | 🟢 Soft | reservoir |
| Derry, New Hampshire | 18 mg/L | 3.9 ppt | 🟢 Soft | reservoir |
| Derry Village, New Hampshire | 18.5 mg/L | 3.9 ppt | 🟢 Soft | reservoir |
| Salem, New Hampshire | 67.5 mg/L | 7.7 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Windham compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Windham | 66.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Windham's Water Unique?
Local geology and source profile
Windham, New Hampshire, in Rockingham County — a Rockingham County town adjacent to Salem and Derry in south New Hampshire — receives its water from the Windham Water Works, drawing from the local Pleistocene glacial outwash aquifer (Rockingham County) through the south New Hampshire distribution.
The soft 66.5 mg/L hardness and TDS of 159.3 mg/L reflect the south New Hampshire Rockingham County glacial outwash supply's soft character — the Pleistocene stratified drift's slightly calcareous component provides minimal hardness, while the underlying Precambrian gneiss contributes insoluble dilution, consistent with the south New Hampshire communities on the shallow glacial aquifer. The glacial outwash aquifer at Rockingham County — Pleistocene stratified drift (slightly calcareous — primary hardness contributor), Precambrian Merrimack Belt gneiss (insoluble — dilutant), and Paleozoic Berwick Formation (insoluble — secondary dilutant).
At 66.5 mg/L, Windham's water is soft — scale forms very slowly in appliances, dishwashers remain efficient, and no softening is needed. Annual descaling is appropriate. The PFAS level of 7.7 ppt warrants a certified drinking water filter — the Rockingham County south New Hampshire former military and industrial corridor contribute to Windham's elevated PFAS readings.
Geology & Source: Windham in Rockingham County draws from the Windham Water Works on local Pleistocene glacial outwash aquifer (Rockingham County, south New Hampshire) — the glacial outwash aquifer at Rockingham County is developed in Pleistocene stratified drift (slightly calcareous) over Precambrian Merrimack Belt gneiss (insoluble) — New Hampshire Rockingham County glacial outwash Pleistocene-Precambrian slightly calcareous supply produces soft water at 66.5 mg/L with TDS 159.3 mg/L.