Plymouth Water Hardness & Quality Report (2026)
Water Hardness
2.5 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
81.9 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 Plymouth, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In Plymouth | 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 Plymouth compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Plymouth, Connecticut | 43.5 mg/L | 7 ppt | 🟢 Soft | reservoir |
| Wolcott, Connecticut | 43 mg/L | 7 ppt | 🟢 Soft | reservoir |
| Bristol, Connecticut | 70 mg/L | 9.3 ppt | 🟡 Moderately Hard | reservoir |
| Waterbury, Connecticut | 15 mg/L | 4.6 ppt | 🟢 Soft | reservoir |
| Torrington, Connecticut | 74.5 mg/L | 9.7 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Plymouth compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Plymouth | 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 Plymouth's Water Unique?
Local geology and source profile
Plymouth, Connecticut, in the Naugatuck Valley Planning Region — a Naugatuck Valley town adjacent to Thomaston and Terryville in west-central Connecticut — receives its water from the Connecticut Water, drawing from the Hancock Reservoir (Naugatuck Valley) through the west-central Connecticut distribution.
The very soft 43.5 mg/L hardness and low TDS of 81.9 mg/L reflect the west-central Connecticut Naugatuck Valley supply's very soft character — the Precambrian Berkshire Schist and Ordovician Hartland Formation contribute insoluble dilution with minimal calcareous contact, typical of the Connecticut Naugatuck River watershed communities (compare Derby CT: 56/101 in the same Naugatuck Valley comparable; Windsor Locks CT: 41/75.7 in the Capitol Planning Region comparable). The Hancock Reservoir at Plymouth — Precambrian Berkshire Schist (insoluble — primary dilutant), Ordovician Hartland Formation (insoluble — secondary dilutant), and Quaternary Naugatuck alluvium (slightly calcareous — minor hardness contributor).
At 43.5 mg/L, Plymouth's water is very soft — scale forms very slowly in appliances, dishwashers remain efficient, and no softening is needed. Annual descaling is appropriate. The PFAS level of 7.0 ppt warrants a certified drinking water filter — the Naugatuck Valley west-central Connecticut industrial and manufacturing corridor contribute to Plymouth's elevated readings.
Geology & Source: Plymouth in Naugatuck Valley is served by Connecticut Water drawing from Hancock Reservoir — the Naugatuck watershed drains Precambrian Berkshire Schist (insoluble) and Ordovician Hartland Formation (insoluble) — CT Naugatuck Valley Plymouth Precambrian insoluble schist supply produces very soft water at 43.5 mg/L with TDS 81.9 mg/L.