Ralls County Pwsd 1, 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.
Ralls County Pwsd 1 at a glance
Ralls County Pwsd 1 serves about 7,662 people through 2,953 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Ralls County, Missouri. EPA system ID: MO2024499; phone on file: 573-221-6615. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is down 1.56 ppb from 1.56 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Ralls County Pwsd 1 is 1.56 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2022 | 1.56 ppb |
| 2021 | 1.56 ppb |
| 2021 | 1.56 ppb |
| 2019 | 1.27 ppb |
| 2018 | 1.27 ppb |
| 2018 | 1.27 ppb |
| 2016 | 0 (not detected) |
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. Ralls County Pwsd 1's reported as 0 (not detected) sits at the 38th percentile in Missouri and the 36th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Ralls County
3 other systems share Ralls County; 3 of them have a higher latest lead result than Ralls County Pwsd 1. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Cannon Pwsd 1 | 6,482 | 4.82 ppb |
| New London Pws | 975 | 5.41 ppb |
| Perry Pws | 694 | 3.47 ppb |
Next steps for Hannibal, MO
Look up your address in Ralls County Pwsd 1'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 Ralls County Pwsd 1 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.