Warwick Water Hardness & Quality Report (2026)
Water Hardness
2.4 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
80 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 Warwick, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In Warwick | 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 Warwick compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Warwick, Rhode Island | 40.5 mg/L | 6.5 ppt | 🟢 Soft | reservoir |
| East Greenwich, Rhode Island | 79 mg/L | 10.4 ppt | 🟡 Moderately Hard | reservoir |
| Cranston, Rhode Island | 73.5 mg/L | 9.8 ppt | 🟡 Moderately Hard | reservoir |
| West Warwick, Rhode Island | 43.5 mg/L | 6.8 ppt | 🟢 Soft | reservoir |
| Barrington, Rhode Island | 52 mg/L | 7.6 ppt | 🟢 Soft | reservoir |
National Benchmark
How Warwick compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Warwick | 40.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Warwick's Water Unique?
Local geology and source profile
Warwick, Rhode Island — the state's second-largest city in Kent County on Narragansett Bay (home of T.F. Green Airport) — draws its municipal water supply from the Scituate Reservoir via the Providence Water Supply Board (PWSB), the regional water authority serving Providence and surrounding communities including Warwick. The Scituate Reservoir is the largest reservoir in New England by volume and feeds the Providence Water regional distribution system. Water hardness in Warwick measures 40.5 mg/L — classified as very soft.
Warwick's very soft supply reflects the ancient, calcium-depleted geology of the Scituate Reservoir watershed in central Rhode Island. The Scituate watershed is underlain by: the Precambrian Scituate Granite Gneiss (a Proterozoic basement gneiss — ancient, calcium-depleted metamorphic rock); the Wamsutta Formation rhyolite (Pennsylvanian volcanic rhyolite — siliceous, minimal carbonate); the Narragansett Basin Pennsylvanian coal measures (shale and sandstone); and the Attleboro Granite and associated Proterozoic igneous intrusives of the Rhode Island Central Uplands. This ancient Precambrian–Pennsylvanian terrain is essentially devoid of calcium carbonate, producing the consistently very soft Scituate Reservoir supply distributed to Warwick and Providence.
With hardness at 40.5 mg/L, Warwick residents enjoy very soft water with minimal scale challenges. Soap and shampoo lather generously. Faucet aerators and showerheads essentially never develop calcium deposits. Providence Water Supply Board consistently delivers water meeting all Rhode Island DEM and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from the Scituate Reservoir (North Branch Pawtuxet River) via the Providence Water Supply Board (PWSB) serving Warwick — the Rhode Island Central Uplands Precambrian (Wamsutta Formation rhyolite, Scituate Granite Gneiss) and Pennsylvanian Narragansett Basin coal measures terrain; very soft supply at 40.5 mg/L in Kent County.