Caledonia Pws, MO
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.
Caledonia Pws at a glance
Caledonia Pws serves about 130 people through 68 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Washington County, Missouri. EPA system ID: MO4010003; phone on file: 573-779-3492. 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 2022 (0.73 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Caledonia Pws is 6.9 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2022 | 0.73 ppb |
| 2021 | 0.73 ppb |
| 2021 | 0.73 ppb |
| 2019 | 0.59 ppb |
| 2018 | 0.59 ppb |
| 2018 | 0.59 ppb |
| 2016 | 6.9 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. Caledonia Pws's reported as 0 (not detected) sits at the 10th percentile in Missouri and the 12th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
9 other systems share Washington County; 7 of them have a higher latest lead result than Caledonia Pws. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Potosi Pws | 2,527 | 1.61 ppb |
| Potosi East | 900 | 4.36 ppb |
| Washington County Pwsd 1 | 503 | 1.45 ppb |
| Irondale Pws | 420 | 1.9 ppb |
| Mo American Rogue Creek Utilities | 276 | 2 ppb |
| Mineral Point Pws | 231 | 2.06 ppb |
| Anthonies Mill Resort Subdivision | 214 | 0 (not detected) |
| Washington County Pwsd 2 | 175 | 1.4 ppb |
| The Legacy Ranch | 25 | 0 (not detected) |
Next steps for Caledonia, MO
Look up your address in Caledonia Pws'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 Caledonia Pws 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. Small systems behave differently: why small systems go over more often.