Maple Terrace Mobile Home Park, OR
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2024-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Maple Terrace Mobile Home Park at a glance
Maple Terrace Mobile Home Park serves about 65 people through 23 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Columbia County, Oregon. EPA system ID: OR4100983; phone on file: 503-208-3268. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Maple Terrace Mobile Home Park is 35 ppb across 9 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2023 | 35 ppb over 15 |
| 2022 | 0 (not detected) |
| 2022 | 35 ppb over 15 |
| 2022 | 0 (not detected) |
| 2019 | 1.5 ppb |
| 2017 | 1.5 ppb |
| 2016 | 1.3 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. Maple Terrace Mobile Home Park's reported as 0 (not detected) sits at the 8th percentile in Oregon and the 6th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Columbia County
37 other systems share Columbia County; 14 of them have a higher latest lead result than Maple Terrace Mobile Home Park. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| St Helens, City Of | 13,410 | 1.03 ppb |
| Scappoose, City Of | 8,710 | 0 (not detected) |
| Mcnulty Water Pud | 2,500 | 0 (not detected) |
| Vernonia, City Of | 2,100 | 0 (not detected) |
| Clatskanie, City Of | 2,096 | 1.27 ppb |
| Warren Water Association | 2,050 | 0 (not detected) |
| Columbia City Mun Waterworks | 1,995 | 0 (not detected) |
| City Of Rainier | 1,932 | 0 (not detected) |
| Western Hills Mh Estates | 375 | 0 (not detected) |
| Fishhawk Lake Reserve And Community | 350 | 6.25 ppb |
Next steps for Happy Valley, OR
Test your own tap with a certified lab first-draw sample; Happy Valley, 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 Maple Terrace Mobile Home Park 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. More in what a past exceedance means today.