Big Oak Marina, OR
Lead detected, under the action levels
Latest 90th-percentile lead: 10 ppb (monitoring period 2024-2024). 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
Big Oak Marina serves about 30 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 Multnomah County, Oregon. EPA system ID: OR4106054; phone on file: 503-289-7879. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is up 6.2 ppb from 3.8 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Big Oak Marina is 10 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 10 ppb |
| 2024 | 3.8 ppb |
| 2023 | 3.8 ppb |
Where this result ranks
Of the 909 Oregon systems with a lead result, the median latest reading is 1 ppb; 15 are over 15 ppb right now and 71 have gone over at some point. Big Oak Marina's 10 ppb sits at the 97th percentile in Oregon and the 97th nationally (higher means more lead).
Other water systems in Multnomah County
24 other systems share Multnomah County; 0 of them have a higher latest lead result than Big Oak Marina. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Portland Water Bureau | 666,200 | 5.01 ppb |
| Gresham, City Of | 73,932 | 3.81 ppb |
| Rockwood Pud | 65,443 | 3.4 ppb |
| Troutdale, City Of | 16,185 | 1.2 ppb |
| Fairview, City Of | 9,963 | 6.89 ppb |
| Wood Village, City Of | 4,388 | 1.4 ppb |
| Corbett Water District | 2,954 | 6.2 ppb |
| Pleasant Home Water District | 1,510 | 5.01 ppb |
| Palatine Hill Water District | 1,500 | 5.01 ppb |
| Lusted Water District | 1,200 | 4 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Portland, OR 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 Big Oak Marina 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Systems that went over once often dip back under; here is what that means.