No health-based violations on EPA record since 2016.
Serves about 23,492 people (7,379 connections) with surface water bought from Seattle Public Utilities, Highline Water District and King County Water District #20.
From EPA's record for WA5339800. PurityMap is independent of King County Water District #49.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from February 2023 to November 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-15 to 2023-11-06 | UCMR5 Analytical Results: KING COUNTY WATER DISTRICT #49 (WA5339800) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →According to EPA's record, King County Water District #49 uses surface water bought from Seattle Public Utilities, Highline Water District and King County Water District #20.
No health-based violations on EPA record since 2016. EPA also lists 1 missed or late test or report in 10 years. The record comes from EPA's SDWIS compliance database.
PurityMap has no verified website for King County Water District #49. Its mailing address on EPA record is 415 SW 153rd, Burien, WA 98166. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.