Bainbridge Island Water Hardness & Quality Report (2026)
Water Hardness
2.2 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
73.7 mg/L
Est. Daily Cost
$0.10
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 Bainbridge Island, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In Bainbridge Island | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.3 yrs | 8.5 yrs | -2% |
| Washing Machine | 12.2 yrs | 12 yrs | — |
| Water Heater | 14.1 yrs | 15 yrs | -6% |
Regional Water Comparison
How Bainbridge Island compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Bainbridge Island, Washington | 38 mg/L | 2.1 ppt | 🟢 Soft | reservoir |
| Bremerton, Washington | 41 mg/L | 2.2 ppt | 🟢 Soft | reservoir |
| Port Orchard, Washington | 70.5 mg/L | 3.1 ppt | 🟡 Moderately Hard | reservoir |
| Silverdale, Washington | 20 mg/L | 1.5 ppt | 🟢 Soft | reservoir |
| Greenwood, Washington | 54 mg/L | 2.6 ppt | 🟢 Soft | reservoir |
National Benchmark
How Bainbridge Island compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Bainbridge Island | 38 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Bainbridge Island's Water Unique?
Local geology and source profile
Bainbridge Island, Washington, in Kitsap County across Puget Sound from Seattle — one of the most desirable residential communities in the Puget Sound region, accessible by the Seattle-Bainbridge ferry — receives its municipal water from the Bainbridge Island Public Works Water Division, drawing from local reservoir impoundments and groundwater wells distributed across the island. The island's abundant Pacific Northwest rainfall and forested watershed supply a distributed network of small reservoirs and wells that collectively serve the community.
The very soft 38 mg/L hardness and very low TDS of 73.7 mg/L reflect Bainbridge Island's geology and climate. The island is underlain by Quaternary glacial deposits — sandy and gravelly outwash, till, and lake sediments deposited by Pleistocene ice sheets — overlying Mesozoic metamorphic and volcanic rocks of the Pacific Northwest basement. These terrains contain virtually no soluble carbonate minerals. The island's high annual precipitation (over 35 inches) and forested land cover mean rainwater drains to surface reservoirs and wells with minimal mineral pickup, producing characteristically soft Pacific Northwest island water.
At 38 mg/L, Bainbridge Island residents enjoy very soft water — excellent for appliances and comfortable for all household uses. Soap lathers abundantly, appliances remain scale-free for extended periods, and glassware from the dishwasher emerges spotless without rinse aid. Annual descaling of kettles and coffee machines is typically sufficient. The characteristic concern for very soft Pacific Northwest water is its mild corrosive tendency — at TDS 73.7, the low-mineral water has limited buffering capacity. Residents in older homes with copper or lead-solder plumbing should flush cold taps before morning use. The exceptional PFAS level of 2.1 ppt is among the lowest in the Washington dataset — Bainbridge Island's residential character and limited industrial activity keep its water supply exceptionally clean.
Geology & Source: Bainbridge Island in Kitsap County draws from local reservoir impoundments and groundwater wells on the island — the watershed drains Quaternary glacial outwash and till overlying Mesozoic metamorphic and igneous rocks with negligible carbonate content — Pacific Northwest crystalline island terrain with high rainfall produces very soft water at 38 mg/L.