Hamilton Water Department, WA
Lead detected, under the action levels
Latest 90th-percentile lead: 0.7 ppb (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
About Hamilton Water Department
Hamilton Water Department serves about 540 people through 150 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Skagit County, Washington. EPA system ID: WA5330700. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
Against the period ending 2022 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Hamilton Water Department is 1 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.7 ppb |
| 2022 | 1 ppb |
| 2019 | 1 ppb |
| 2016 | 1 ppb |
How Hamilton Water Department 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. Hamilton Water Department's 0.7 ppb sits at the 43rd percentile in Washington and the 46th nationally (higher means more lead).
Nearby utilities
38 other systems share Skagit County; 22 of them have a higher latest lead result than Hamilton Water Department. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Skagit County Pud 1 Judy Res | 111,415 | 0 (not detected) |
| Anacortes City Of | 25,109 | 1.1 ppb |
| Shelter Bay Community Inc | 2,212 | 1.6 ppb |
| Skagit Co Water District #1 | 1,974 | 0 (not detected) |
| La Conner Water Dept | 1,821 | 0 (not detected) |
| Blanchard Edison Water Assn. Inc. | 1,480 | 2.8 ppb |
| Concrete Utilities | 1,234 | 1.8 ppb |
| Samish Farms Water Assn | 1,017 | 5.3 ppb |
| Cape Horn Maintenance Company | 940 | 1.4 ppb |
| Lyman Water Department | 705 | 3.1 ppb |
Next steps for Maple Falls, WA
Test your own tap with a certified lab first-draw sample; Maple Falls, 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 Hamilton Water Department 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. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.