Trumbull Water Hardness & Quality Report (2026)
Water Hardness
4.6 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
187.9 mg/L
Est. Daily Cost
$0.21
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 Trumbull, your appliances are currently losing 11% efficiency due to mineral buildup.
| Appliance | In Trumbull | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7 yrs | 8.5 yrs | -18% |
| Washing Machine | 10.7 yrs | 12 yrs | -11% |
| Water Heater | 12.4 yrs | 15 yrs | -17% |
Regional Water Comparison
How Trumbull compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Trumbull, Connecticut | 79.5 mg/L | 10.2 ppt | 🟡 Moderately Hard | reservoir |
| Bridgeport, Connecticut | 69 mg/L | 9.2 ppt | 🟡 Moderately Hard | reservoir |
| Stratford, Connecticut | 57 mg/L | 8.2 ppt | 🟢 Soft | reservoir |
| Fairfield, Connecticut | 80.5 mg/L | 10.2 ppt | 🟡 Moderately Hard | reservoir |
| Shelton, Connecticut | 25 mg/L | 5.4 ppt | 🟢 Soft | reservoir |
National Benchmark
How Trumbull compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Trumbull | 79.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Trumbull's Water Unique?
Local geology and source profile
Trumbull, Connecticut, in Fairfield County — a major southwest Connecticut Fairfield County suburban community adjacent to Bridgeport (Trumbull is directly north of Bridgeport — one of the wealthier suburbs adjacent to Connecticut's largest city), a primarily residential upper-middle-class Fairfield County community, home of one of the stronger public school systems in southwest Connecticut (Trumbull is consistently ranked among the top suburban Connecticut communities for public education quality), and a diverse Fairfield County community in the greater Bridgeport–Stamford metro area — draws its municipal water supply from the Pequonnock River via the Aquarion Water Company. Water hardness in Trumbull measures 79.5 mg/L — classified as moderately soft.
Trumbull's moderate softness reflects the southwest Connecticut Pequonnock River watershed's calcareous-poor geology. The Pequonnock River at Trumbull–Fairfield County drains: the Precambrian–Paleozoic calcareous-poor Connecticut gneiss and schist (the highly resistant southern Connecticut Appalachian crystalline basement); and the Jurassic calcareous-poor Portland Arkose (the Hartford Basin red sandstone — calcareous-poor). Aquarion Water treatment produces the moderate 79.5 mg/L.
With hardness at 79.5 mg/L, Trumbull residents enjoy moderately soft water. Aquarion Water Company consistently delivers water meeting all Connecticut DEEP and EPA Safe Drinking Water Act requirements.
Geology & Source: River and reservoir supply from the Pequonnock River and Trumbull Reservoir via the Aquarion Water Company (Connecticut) — the Fairfield County southwest Connecticut Pequonnock River Valley (Triassic–Jurassic calcareous-poor Hartford Basin red sediment and Precambrian calcareous-poor Connecticut gneiss — the southwest Connecticut crystalline and Hartford Basin geology; Aquarion Water south Fairfield distribution); moderately soft supply at 79.5 mg/L in Fairfield County.