South Prairie Water Assn, OR
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
Who runs the water here
South Prairie Water Assn serves about 440 people through 165 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Tillamook County, Oregon. EPA system ID: OR4100892; phone on file: 503-842-4637. Call that number and ask whether your address has a lead, galvanized or unknown service line.
South Prairie Water Assn's lead record
Against the period ending 2022 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for South Prairie Water Assn is 13.9 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 1 ppb |
| 2019 | 0 (not detected) |
| 2016 | 13.9 ppb over 10 |
Against other Oregon systems
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. South Prairie Water Assn's reported as 0 (not detected) sits at the 28th percentile in Oregon and the 21st nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
34 other systems share Tillamook County; 18 of them have a higher latest lead result than South Prairie Water Assn. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Tillamook Water Dept, City Of | 5,265 | 0 (not detected) |
| Manzanita, City Of | 3,200 | 0 (not detected) |
| Fairview Water District | 1,930 | 2.03 ppb |
| Netarts Water District | 1,800 | 0 (not detected) |
| Neskowin Reg Water Dist | 1,735 | 0 (not detected) |
| Nehalem, City Of | 1,700 | 1.92 ppb |
| Rockaway Beach, City Of | 1,533 | 0 (not detected) |
| Bay City Water System | 1,400 | 0 (not detected) |
| Long Prairie Water District | 1,052 | 0 (not detected) |
| Pacific City Joint Water - San Auth | 1,000 | 1.8 ppb |
Your move
Look up your address in South Prairie Water Assn'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 South Prairie Water Assn 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. Small systems behave differently: why small systems go over more often.