King County, WA · PWSID WA5341998
King County Water District #125 lead service lines
5 lead or galvanized lines to replace
King County Water District #125 reported 0 lead and 5 galvanized-requiring-replacement service lines out of 3,416 in its inventory. That's about 1 in 683 lines. Another 1,194 (35%) are still listed as unknown material.
Ranks #66 of 112 Washington systems with confirmed lead lines, and #5,290 nationally.
0.1% of King County Water District #125's service lines are lead or galvanized requiring replacement. That's lower than the Washington average (0.3%) and lower than the national average (3.1%).
- Lead 0%
- Galvanized (replace) 0.1%
- Unknown 35%
- Non-lead 65%
Total service lines reported: 3,416. Reported all required service line types. Population served: 21,904; 7,267 connections.
Progress since 2025 Q1
Reported lead and galvanized-requiring-replacement lines went from 5 in 2025 Q1 to 5 in 2026 Q3: no change. Lines of unknown material went from 1,194 to 1,194, no change.
Quarterly counts reported to EPA. A drop usually means lines were replaced or confirmed non-lead; a rise usually means more lines were identified. Replacement progress rankings.
Lead rule violations
EPA's data lists no Lead and Copper Rule violations for King County Water District #125 since 2015. That covers testing, reporting, corrosion control and public notice requirements; it isn't a guarantee about any individual home.
Source: EPA SDWIS violation records for the Lead and Copper Rule.
Where the water comes from
King County Water District #125's main water source is purchased surface water. It buys treated water from Seattle Public Utilities, King County Water District #20, Skyway Water & Sewer, Tukwila Water Department, Highline Water District. The seller treats the water, including corrosion control that keeps lead from dissolving out of pipes, while King County Water District #125 is responsible for its own service line inventory and replacement program. It sells water to 2 other water systems: King County Water District #20, Tukwila Water Department.
Source: EPA SDWIS water system and facility records.
Check your own address
These counts cover the whole system. To see whether your line is lead, use the utility's address-level inventory. Utilities had to prepare one by October 16, 2024 and make it publicly accessible; systems serving more than 50,000 people must post it online.
No map yet? Do the 2-minute scratch and magnet test on the pipe where water enters your home.
Protect your drinking water now
If your line is lead, galvanized or unknown, filter water for drinking, cooking and baby formula. Use a filter certified to NSF/ANSI 53 for lead. Run cold water for a few minutes after it sits for hours, and never use hot tap water for cooking.
How to pick a lead-certified filter · How to test your water for lead
Getting the line replaced
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask King County Water District #125 whether it replaces the private side for free or with a cost share before you hire anyone. If you want it done sooner, or your utility doesn't cover your side, a licensed plumber can quote it. What replacement costs.
County pages: Lead pipes in King County
Cities served
Other water systems nearby
| System | Lead + galv. | Unknown |
|---|---|---|
| Soos Creek Water & Sewer District | 246 | 0 |
| City of Kirkland | 82 | 0 |
| King County Water District #20 | 141 | 0 |
| North City Water District | 459 | 41 |
| Lake Meridian Water District | 6 | 179 |
| Algona Water Dept | 8 | 848 |
| Skykomish Water Dept | 18 | 195 |
| Remolif Addition | 25 | 0 |
Check another water system
Questions
Does King County Water District #125 have lead pipes?
Yes. King County Water District #125 reported 0 lead service lines and 5 galvanized lines that must be replaced, out of 3,416 total. 1,194 more are of unknown material.
How do I check if my home's service line is lead?
Look up your address on King County Water District #125's official service line inventory, which utilities must make publicly available. You can also scratch the pipe where it enters your home: lead is soft, dull gray, scratches to shiny silver and does not attract a magnet.
When will King County Water District #125 replace lead service lines?
Under EPA's Lead and Copper Rule Improvements, most systems must replace lead and galvanized-requiring-replacement lines by December 31, 2037, starting from November 1, 2027. The rule is being challenged in court, so dates could change. Many utilities run free or cost-share programs now.
Has King County Water District #125 had lead violations?
EPA's data shows no Lead and Copper Rule violations since 2015 for King County Water District #125.
Which water filters remove lead?
Use a filter certified to NSF/ANSI Standard 53 for lead reduction, or NSF/ANSI 58 for reverse osmosis. Check the certification on NSF's listings, not just the box.
Embed or cite this data
Local news sites, blogs and community groups can embed this card. It updates when EPA releases new data.
Citation: Lead Pipe Map, "King County Water District #125 lead service lines," https://leadpipemap.com/wa/king-county-water-district-125/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.