Coventry Water Hardness & Quality Report (2026)
Water Hardness
4.3 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
188 mg/L
Est. Daily Cost
$0.19
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 Coventry, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Coventry | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.2 yrs | 8.5 yrs | -15% |
| Washing Machine | 10.9 yrs | 12 yrs | -9% |
| Water Heater | 12.7 yrs | 15 yrs | -15% |
Regional Water Comparison
How Coventry compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Coventry, Rhode Island | 73 mg/L | 9.8 ppt | 🟡 Moderately Hard | reservoir |
| West Warwick, Rhode Island | 43.5 mg/L | 6.8 ppt | 🟢 Soft | reservoir |
| Johnston, Rhode Island | 15 mg/L | 3.9 ppt | 🟢 Soft | reservoir |
| East Greenwich, Rhode Island | 79 mg/L | 10.4 ppt | 🟡 Moderately Hard | reservoir |
| Killingly Center, Connecticut | 99 mg/L | 11.9 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Coventry compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Coventry | 73 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Coventry's Water Unique?
Local geology and source profile
Coventry, Rhode Island, in Kent County — the largest town by area in Rhode Island (Coventry is Rhode Island's largest municipality by land area — a primarily rural and suburban town with a significant manufactured housing and single-family residential character in the Kent County corridor), home of the Nathanael Greene Homestead (the farm home of General Nathanael Greene — George Washington's second-in-command in the Revolutionary War and one of the most capable American military leaders of the revolution, born and raised in Coventry), a diverse Kent County community, and part of the Providence–Warwick suburban corridor in central Rhode Island — draws its municipal water supply from the Flat River and Scituate Reservoir system via the Providence Water Supply Board or Aquarion Water. Water hardness in Coventry measures 73 mg/L — classified as moderately soft.
Coventry's moderate softness reflects the central Rhode Island watershed's calcareous-poor crystalline geology. The Flat River Reservoir and Scituate Reservoir watershed in Kent County drain: the Precambrian–Paleozoic Rhode Island Avalon Terrane (calcareous-poor granite and gneiss — the highly resistant Rhode Island crystalline basement with minimal dissolved calcium carbonate); and the Plainfield arkose (calcareous-poor). The calcareous-poor Rhode Island crystalline watershed produces the moderate 73 mg/L.
With hardness at 73 mg/L, Coventry residents enjoy moderately soft water. Providence Water Supply Board or Aquarion Water consistently delivers water meeting all Rhode Island DEM and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from the Flat River Reservoir and Scituate Reservoir watershed via the Aquarion Water Company (Rhode Island) or Providence Water Supply Board — the Kent County central Rhode Island Pawtuxet River Valley (Precambrian–Paleozoic calcareous-poor Rhode Island gneiss and schist — the calcareous-poor Rhode Island crystalline basement; Kent County supply zone); moderately soft supply at 73 mg/L in Kent County.