Mo American St Louis St Charles Counties, 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
Mo American St Louis St Charles Counties serves about 1,111,000 people through 376,501 service connections, which makes it a very large system under EPA's size classes. It is privately owned and draws surface water, in St. Charles,St. Louis County, Missouri. EPA system ID: MO6010716; phone on file: 314-548-0199. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Mo American St Louis St Charles Counties's lead record
Against the period ending 2024 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Mo American St Louis St Charles Counties is 3 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 1 ppb |
| 2024 | 1 ppb |
| 2022 | 1 ppb |
| 2022 | 1 ppb |
| 2019 | 1 ppb |
| 2016 | 3 ppb |
How Mo American St Louis St Charles Counties compares
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. Mo American St Louis St Charles Counties's reported as 0 (not detected) sits at the 40th percentile in Missouri and the 40th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Next steps for Chesterfield, MO
Look up your address in Mo American St Louis St Charles Counties'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 Mo American St Louis St Charles Counties 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.