Colony Mountain, WA
Lead detected, under the action levels
Latest 90th-percentile lead: 0.7 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. 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.
Who runs the water here
Colony Mountain serves about 213 people through 82 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Skagit County, Washington. EPA system ID: WA5314069. Ask the utility on your bill for your address in their service line inventory.
Colony Mountain's lead record
Against the period ending 2020 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Colony Mountain is 1.3 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0.7 ppb |
| 2020 | 1 ppb |
| 2017 | 1.3 ppb |
Where this result ranks
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. Colony Mountain's 0.7 ppb sits at the 42nd 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 Colony Mountain. 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 |
What to do in your house
Test your own tap with a certified lab first-draw sample; Lynden, 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 Colony Mountain 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. The action level is dropping - the 10 ppb rule from 2027.