Windham Water Hardness & Quality Report (2026)
Water Hardness
2.3 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
73.3 mg/L
Est. Daily Cost
$0.11
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 5% efficiency due to mineral buildup.
| Appliance | In Windham | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.3 yrs | 8.5 yrs | -2% |
| Washing Machine | 12.1 yrs | 12 yrs | — |
| Water Heater | 14 yrs | 15 yrs | -7% |
Regional Water Comparison
How Windham compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Windham, Connecticut | 40 mg/L | 6.7 ppt | 🟢 Soft | reservoir |
| Willimantic, Connecticut | 37 mg/L | 6.5 ppt | 🟢 Soft | reservoir |
| Mansfield City, Connecticut | 41.5 mg/L | 6.9 ppt | 🟢 Soft | reservoir |
| Storrs, Connecticut | 56 mg/L | 8.1 ppt | 🟢 Soft | reservoir |
| Norwich, Connecticut | 98.5 mg/L | 11.8 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Windham compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Windham | 40 mg/L | 🟢 None |
| 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, Connecticut, in Windham County — also known as Willimantic, its borough seat, and historically called the Thread City for its once-mighty American Thread Company textile mills on the Willimantic River — receives its municipal water from the Willimantic Water Company or the Town of Windham Water Division, drawing from local reservoir impoundments in the Willimantic River watershed of eastern Connecticut. The Willimantic River drains the forested hills of eastern Windham County toward the Shetucket River.
The very soft 40 mg/L hardness and low TDS of 73.3 mg/L reflect eastern Connecticut's classic Avalonian basement geology. The Willimantic watershed drains the Quinnebaug Highlands and eastern Connecticut Hills — a rugged upland landscape underlain by Precambrian Proterozoic volcanic rocks (the Plainfield Formation metavolcanics), Avalonian metasedimentary basement, and Carboniferous Narragansett Basin sedimentary rocks — all crystalline or siliciclastic terrains with essentially no soluble carbonate minerals. Eastern Connecticut's abundant precipitation draining through these ancient volcanic and crystalline rocks picks up minimal minerals, producing characteristically soft water throughout the Windham County supply zone.
At 40 mg/L, Windham's water is very soft — excellent for textile manufacturing historically and comfortable for all household uses today. Scale forms very slowly in kettles and appliances over many months, soap lathers abundantly, and glassware from the dishwasher is spotless. Annual descaling of heating appliances is typically adequate. The primary consideration for very soft Connecticut water is its mild corrosive tendency — very low TDS water has minimal buffering capacity, and residents in older Thread City mill-era homes with aging plumbing should flush cold taps before morning drinking. The PFAS level of 6.7 ppt warrants a certified drinking water filter — Windham County has documented PFAS sources from regional military and industrial legacy sites in the broader northeast Connecticut corridor.
Geology & Source: Windham in Windham County draws from the Town of Windham or Willimantic Water reservoir system on the Willimantic River — the Willimantic watershed drains eastern Connecticut over the Avalonian basement terrain (Precambrian volcanic and metasedimentary rocks) with negligible carbonate content — Avalonian crystalline drainage produces very soft water at 40 mg/L in this eastern Connecticut mill town.