Seawest Water System, WA
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 12.2 ppb (monitoring period 2021-2023). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Who runs the water here
Seawest Water System serves about 38 people through 25 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Island County, Washington. EPA system ID: WA5337544. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
That is up 7.9 ppb from 4.3 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Seawest Water System is 12.2 ppb across 2 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 12.2 ppb over 10 |
| 2022 | 4.3 ppb |
How Seawest Water System compares
Of the 2,218 Washington systems with a lead result, the median latest reading is 1 ppb; 18 are over 15 ppb right now and 62 have gone over at some point. Seawest Water System's 12.2 ppb sits at the 98th percentile in Washington and the 98th nationally (higher means more lead).
Nearby utilities
232 other systems share Island County; 4 of them have a higher latest lead result than Seawest Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Oak Harbor City Of | 23,675 | 1.2 ppb |
| Naval Air Station/Whidbey Island | 16,595 | 3.4 ppb |
| Coupeville Town Of | 4,142 | 3.5 ppb |
| Camano Water Association | 2,592 | 1 ppb |
| Clinton Water District | 1,980 | 9.8 ppb |
| Langley City Of | 1,416 | 1.9 ppb |
| Harbor Hills Community Water System | 1,373 | 3 ppb |
| Freeland Water And Sewer District | 1,264 | 0 (not detected) |
| W&B Waterworks 1 | 1,112 | 1.3 ppb |
| Camano Co-Op Water & Power Co | 1,071 | 9.5 ppb |
Next steps for Mt Vernon, WA
Test your own tap with a certified lab first-draw sample; Mt Vernon, WA may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Seawest Water System whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. Why sampled homes are the worst-case ones is in the guide to reading the number. This system is in the band the 2027 10 ppb rule changes.