Twin Oaks Harbor, MO
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
Twin Oaks Harbor serves about 50 people through 114 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in St. Clair County, Missouri. EPA system ID: MO5240546; phone on file: 417-321-1713. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Twin Oaks Harbor is 1.27 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 1.02 ppb |
| 2019 | 1.02 ppb |
| 2016 | 1.27 ppb |
| 2016 | 1.27 ppb |
Where this result ranks
Of the 1,674 Missouri systems with a lead result, the median latest reading is 1.04 ppb; 2 are over 15 ppb right now and 74 have gone over at some point. Twin Oaks Harbor's reported as 0 (not detected) sits at the 4th percentile in Missouri and the 3rd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in St. Clair County
4 other systems share St. Clair County; 3 of them have a higher latest lead result than Twin Oaks Harbor. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Appleton City Pws | 1,050 | 1.62 ppb |
| Osceola Pws | 947 | 0 (not detected) |
| Lowry City Pws | 640 | 3.26 ppb |
| Collins Pws | 125 | 1.25 ppb |
Next steps for Cole Camp, MO
Look up your address in Twin Oaks Harbor'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 Twin Oaks Harbor 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. Why sampled homes are the worst-case ones is in the guide to reading the number. A zero today does not rule out a jump later - the rules are tightening in 2027.