Knappa Water Association, OR
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2022-2024). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Knappa Water Association at a glance
Knappa Water Association serves about 1,800 people through 605 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Clatsop County, Oregon. EPA system ID: OR4100061; phone on file: 503-458-6461. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2021 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Knappa Water Association is 0 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2018 | 0 (not detected) |
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. Knappa Water Association's reported as 0 (not detected) sits at the 33rd percentile in Oregon and the 30th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Clatsop County
20 other systems share Clatsop County; 11 of them have a higher latest lead result than Knappa Water Association. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Astoria, City Of | 10,181 | 1.56 ppb |
| Warrenton, City Of | 9,100 | 1.15 ppb |
| Seaside Water Department | 7,482 | 0.71 ppb |
| Youngs River Lewis & Clark Wd | 2,580 | 0 (not detected) |
| Gearhart Water Department | 1,780 | 0 (not detected) |
| Cannon Beach, City Of | 1,710 | 0 (not detected) |
| Wickiup Water District | 1,630 | 4 ppb |
| Olney-Walluski Water Assn | 575 | 1 ppb |
| Westport Water Association | 550 | 3.22 ppb |
| Burnside Water Association | 350 | 3 ppb |
Next steps for Astoria, OR
Look up your address in Knappa Water Association's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Knappa Water Association 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. A zero today does not rule out a jump later - the rules are tightening in 2027.