Snohomish County, WA · PWSID WA5355820
Monroe Water System lead service lines
328 lines still unidentified
Monroe Water System reported no confirmed lead service lines, but 328 of 7,555 lines (4.3%) are still listed as "lead status unknown." Until a line is identified, treat it as possibly lead.
0% of Monroe Water System'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%
- Unknown 4.3%
- Non-lead 96%
Total service lines reported: 7,555. Reported all required service line types. Population served: 23,467; 8,699 connections.
Progress since 2025 Q1
Reported lead and galvanized-requiring-replacement lines went from 0 in 2025 Q1 to 0 in 2026 Q3: no change. Lines of unknown material went from 328 to 328, 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 Monroe Water System 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
Monroe Water System's main water source is purchased surface water. It buys treated water from City of Everett Public Works Dept.. The seller treats the water, including corrosion control that keeps lead from dissolving out of pipes, while Monroe Water System is responsible for its own service line inventory and replacement program. It sells water to 1 other water system: Marbello.
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 Monroe Water System 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 Snohomish County
Cities served
Other water systems nearby
| System | Lead + galv. | Unknown |
|---|---|---|
| Alderwood Water District | 0 | 24,002 |
| City of Arlington | 0 | 983 |
| City of Stanwood Water Dept | 0 | 1,240 |
| Roosevelt Water Association | 0 | 464 |
| Highland Water District | 0 | 413 |
| City of Gold Bar | 2 | 0 |
| Town of Darrington | 0 | 411 |
| Cascade Vista HOA | 1 | 80 |
Check another water system
Questions
Does Monroe Water System have lead pipes?
It hasn't confirmed any, but 328 of its 7,555 service lines are still of unknown material, so lead has not been ruled out.
How do I check if my home's service line is lead?
Look up your address on Monroe Water System'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 Monroe Water System 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 Monroe Water System had lead violations?
EPA's data shows no Lead and Copper Rule violations since 2015 for Monroe Water System.
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, "Monroe Water System lead service lines," https://leadpipemap.com/wa/monroe-water-system/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.