Washington · population 34,024
Lead pipes in SeaTac, WA
No lead lines reported
Most of SeaTac (population 34,024) gets its water from Highline Water District, which reported 18,780 service lines and no lead, galvanized or unknown lines.
0% of Highline Water District's service lines are lead or galvanized requiring replacement, lower than the Washington average (0.3%) and lower than the national average (3.1%).
- Lead 0%
- Galvanized (replace) 0%
- Unknown 0%
- Non-lead 100%
Latest lead test for Highline Water District (Jan 2023–Dec 2025): 1.4 ppb at the 90th percentile, against a 15 ppb federal action level. Full test history.
Compliance record: EPA lists no Lead and Copper Rule violations since 2015 for Highline Water District.
Water systems serving SeaTac
| Water system | Lead | Galv. | Unknown | % lead |
|---|---|---|---|---|
| Highline Water DistrictMain system | 0 | 0 | 0 | 0% |
| King County Water District #125Serves nearby areas | 0 | 5 | 1,194 | 0.1% |
Matched from EPA water system service area boundaries and the cities each system reports serving. Edges of the city may be served by a neighboring system; your water bill names your utility.
Check your address in SeaTac
The counts above cover the whole water system. To see whether your line is lead, look up your address on Highline Water District's official inventory. Utilities had to make these public by October 16, 2024.
No map yet? Do the 2-minute scratch and magnet test.
Protect your drinking water
If your line is lead, galvanized or unknown, use a filter certified to NSF/ANSI 53 for lead for drinking, cooking and baby formula, and use only cold water.
Choosing a lead-certified filter · Testing your water · Replacement cost
Nearby cities
- Normandy Parkno lead reported
- Tukwila5 lead + galv. lines
- Burien141 lead + galv. lines
- Des Moinesno lead reported
- Kentno lead reported
- Rentonno lead reported
- Newcastleno lead reported
- Mercer Islandno lead reported
Check another water system
Questions
Does SeaTac, WA have lead pipes?
Highline Water District, which serves SeaTac, reported no lead, galvanized or unknown service lines.
Who supplies water to SeaTac?
EPA's service area maps place most of SeaTac in Highline Water District's service area (PWSID WA5340650). King County Water District #125 also serves parts of the city or nearby areas.
How do I check whether my SeaTac home has a lead service line?
Search your address on Highline Water District's service line inventory map. You can also scratch the pipe where water enters your home: lead is soft, dull gray, scratches to shiny silver and doesn't attract a magnet.
When will lead pipes in SeaTac be replaced?
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask Highline Water District whether your street is scheduled and whether it covers the private side.