Hardness
Moderately Hard
106 PPM · 6.2 GPG
Local water dashboard
Official source aggregationWater quality in Bainbridge Island, WA 98110
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Kitsap County.
No active health-based violation reported
- Primary matched system
- Bainbridge Island City Of
- Source water
- Groundwater
- County
- Kitsap County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0.003 mg/L
20% of action level
Utility match
1 system
Serves 13,491 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
106 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
106
mg/L as CaCO₃ equivalent
Grains per gallon
6.2
1 GPG ≈ 17.1 PPM
What this means at home
At 106 PPM, mineral scale can build up on fixtures and heating elements, reduce soap lather, and leave visible spotting. Hardness is primarily an aesthetic and appliance concern—not itself a tap-water safety rating.
USGS sites used
45
Nearest site
8.3 mi
Observation range
Aug 22, 2016–Aug 12, 2024
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 24N/01E-22H01 OUBT-718 BOTTOM (Well).USGS source documentation ↗
Regional context
Is 98110 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Bainbridge Island median
106 PPM
About the same1 indexed ZIP readings · Range 106–106 PPM
Washington median
104 PPM
About the same189 indexed ZIP readings · Range 20.6–238 PPM
EPA benchmark screen
Contaminant snapshot
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
1 pass
Lead (PB90)
0.003 mg/L
Reported Dec 31, 2025
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
1 comparable result
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.003
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 0
- Health-based
- 0
- Active health-based
- 0
No violation record was returned for the associated systems in the imported lookback window beginning Jan 1, 2021.
No reported violation does not prove that every contaminant was tested or absent; SDWIS measured values are incomplete and lag state records.
Solutions matcher
Your personalized water action plan
Matched to Bainbridge Island ZIP 98110 using 106 PPM nearby hardness and 1 reported measurement benchmarks.
No urgent match
Start with an independent water test
This profile does not trigger a treatment recommendation. Test at the tap before investing in equipment.
Affiliate disclosure: we may earn a commission from qualifying purchases, at no added cost to you. Product matching is educational and does not replace certified water testing.
Frequently asked
Water questions for Bainbridge Island
Is tap water safe in Bainbridge Island?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
Nearby USGS observations produce an estimate of 106 PPM, or 6.2 grains per gallon, classified as moderately hard. This is not a household tap measurement.
Do I need a water softener?+
There is no high-hardness trigger in this profile. Confirm with a tap test before buying equipment.