KING COUNTY WATER DISTRICT #20
Seattle, WA · 48,469 served
KING COUNTY WATER DISTRICT #20 serves 48,469 people in Seattle, WA. It has 0 health-based violations in the last 5 years. TapGraded gives this system an A.
Score breakdown
Health-based violations (5y)
0
Monitoring violations (5y)
0
Currently unaddressed
0
Overall score
100/100
Violation history (last 5 years)
No violations on record.
Get alerted when KING COUNTY WATER DISTRICT #20 gets a violation
Alert emails are in development; once they launch, we'll only email you about this water system. Unsubscribe anytime via contact@tapgraded.com.
Lead (Lead and Copper Rule)
EPA's current lead action level is 15 ppb (dropping to 10 ppb in 2027 under the Lead and Copper Rule Improvements).
No lead sampling results on record for this period.
PFAS (UCMR5 occurrence data)
System details
- System type
- Community water system
- Water source
- Surface water purchased from another system
- Ownership
- Local government
- Service connections
- 14,783
Worried about what's in your tap?
See which water filters are certified to remove the contaminants found in your area.
Find a filter that matches your waterFrequently asked questions
Is Seattle, WA tap water safe to drink?
KING COUNTY WATER DISTRICT #20 has 0 health-based violations in the last 5 years. TapGraded gives this system an A. A Tap Grade summarizes public EPA compliance records; it is not a determination that water is safe or unsafe to drink.
Does KING COUNTY WATER DISTRICT #20 have lead in its water?
No lead sampling results on record for this period.
Has PFAS been detected in KING COUNTY WATER DISTRICT #20's water?
This system was tested under UCMR5 and no PFAS was detected above the reporting limit in the analytes we track.
Source: EPA SDWIS/ECHO · Data as of 2026Q2
TapGraded presents public EPA data for information only — it is not health advice and not a determination that any water is safe or unsafe to drink. For health concerns, contact your water utility or local health department.