King County Water District #20
Published drinking-water records and contacts for King County Water District #20. System WA5338950. Review sources and dates; not a real-time water assessment.
- System ID
- WA5338950
- State or territory
- WA
- Published population served
- 48469
- System type (source code)
- CWS
Published records and dates
- PFAS / lithium (EPA UCMR 5): 120 — 2024-03-11 – 2024-12-04
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Published testing results
Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.
“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example
| Substance | Published result | Reporting limit | Sample date | Sampling location |
|---|---|---|---|---|
| 11Cl-PF3OUdS | < 0.005 µg/L | 0.005 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| 4:2 FTS | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| 6:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| 8:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| 9Cl-PF3ONS | < 0.002 µg/L | 0.002 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| ADONA | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| HFPO-DA | < 0.005 µg/L | 0.005 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| NEtFOSAA | < 0.005 µg/L | 0.005 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| NFDHA | < 0.02 µg/L | 0.02 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| NMeFOSAA | < 0.006 µg/L | 0.006 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFBA | < 0.005 µg/L | 0.005 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFBS | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFDA | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFDoA | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFEESA | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFHpA | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFHpS | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFHxA | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFHxS | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFMBA | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFMPA | < 0.004 µg/L | 0.004 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFNA | < 0.004 µg/L | 0.004 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFOA | < 0.004 µg/L | 0.004 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFOS | < 0.004 µg/L | 0.004 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFPeA | < 0.003 µg/L | 0.003 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFPeS | < 0.004 µg/L | 0.004 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFTA | < 0.008 µg/L | 0.008 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFTrDA | < 0.007 µg/L | 0.007 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| PFUnA | < 0.002 µg/L | 0.002 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
| lithium | < 9 µg/L | 9 µg/L | 2024-12-04 | Seattle Intertie / INTERTIE |
Download all EPA UCMR 5 records (CSV)
Published compliance history
1 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Total Coliform Rule / Maximum Contaminant Level Violation, Monthly (TCR) | 2003-07-01 – 2003-07-31 | Archived | Yes | 2026Q3 |
Source dates and refresh checks
A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.
- EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
- EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
- EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.