Tap Water Quality in Seattle, Washington (ZIP 98101)
Serving Seattle, Washington
Is the Tap Water Safe in Seattle, Washington?
Tap water in Seattle, Washington (ZIP 98101) has 2 contaminants above EPA health-based guidelines (MCLGs) in at least one of the 1 city served. We recommend reviewing detailed city reports below and considering a certified water filter for additional protection.
ZIP 98101 is served by 2 water utilities providing water to Seattle. Water quality varies by utility and city. Click on the cities below to see detailed reports for your specific area.
How does Washington water quality rank nationally? →Get your water tested in Washington →
Water Hardness in ZIP 98101
Sources differ on this value: reported figures range 30.9–53.3 mg/L. We publish the best-supported utility value above.
Washington water hardness →US water hardness data →Hardness calculator & converter →US hardness map →
Water Quality Report for ZIP 98101
2 contaminants above EPA health guidelines
These levels represent the worst case across all cities in this ZIP code. Check individual city reports for specific details.
Found in Seattle
Found in Seattle
Worried about Arsenic in your water?
You're viewing 2 contaminants above health-based guidelines here, including Arsenic. Your own tap water can differ — upload your test (PDF or a photo) and we'll email a full plain-English reading of every number, free.
Your upload also helps us keep local water data accurate — we only ever share anonymized, area-level summaries.
Upload my testWater Utilities Serving ZIP 98101
CHERRYWOOD MOBILE HOME MANOR
Serves Seattle; EPA holds no ZIP-level record for this system.
120
Not available
Water Source:
Groundwater
Contaminants:
17 results on file
SEATTLE PUBLIC UTILITIES
Serves Seattle; EPA holds no ZIP-level record for this system.
955,506
Not available
Water Source:
Surface water
Contaminants:
142 results on file
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Best Water Filters for Seattle (ZIP 98101)
Based on the contaminants found in your area, we recommend NSF-certified water filters that can remove the specific contaminants above health guidelines.
Filter guides for the contaminants detected here:
Browse filters certified to remove Arsenic
See every filter in our database independently certified to reduce Arsenic, with the NSF/ANSI standard behind each listing — consumer brands shown first, no marketing spin.
Browse filters certified for ArsenicFrequently Asked Questions about Seattle Tap Water
Is the tap water safe in Seattle, Washington (ZIP 98101)?
Which water utilities serve ZIP code 98101?
How do I pay my water bill in Seattle (ZIP 98101)?
What contaminants are in Seattle water (ZIP 98101)?
Should I use a water filter in Seattle (ZIP 98101)?
What cities are in ZIP code 98101?
How we built this page
Water-quality data on this page comes from public federal and state records for the 2 utilityies serving ZIP 98101. We refresh each utility's record whenever its underlying source publishes new data.
- Contaminants & violations: EPA Safe Drinking Water Information System (SDWIS) plus the Unregulated Contaminant Monitoring Rule (UCMR-5) for PFAS and emerging contaminants.
- Annual reports: the most recent published Consumer Confidence Report (CCR) from each utility serving this ZIP, where available.
- Service area & contact: EPA SDWIS. The compliance records it holds for these systems are reported to EPA by Washington State Dept of Health, the state's drinking-water primacy agency.
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