Magnolia-Le Triomphe Subdivision, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 0.79 ppb (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. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
About Magnolia-Le Triomphe Subdivision
Magnolia-Le Triomphe Subdivision serves about 1,278 people through 426 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Lafayette Parish County, Missouri. EPA system ID: LA1055162; phone on file: 314-464-4790. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
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 Magnolia-Le Triomphe Subdivision is 0.79 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.79 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 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. Magnolia-Le Triomphe Subdivision's 0.79 ppb sits at the 46th percentile in Missouri and the 47th nationally (higher means more lead).
Neighbouring systems
22 other systems share Lafayette Parish County; 4 of them have a higher latest lead result than Magnolia-Le Triomphe Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Magnolia-Jackson Square | 825 | 0 (not detected) |
| Magnolia-Windy Meadows | 549 | 1 ppb |
| Magnolia-Garden Heights Subdivision Ws | 483 | 0 (not detected) |
| Magnolia-Markridge Park Subdivision | 468 | 0 (not detected) |
| Magnolia-Beau Parterre | 462 | 0 (not detected) |
| Magnolia-Shenandoah Estates | 396 | 0.41 ppb |
| Magnolia-Ossun Heights | 393 | 0 (not detected) |
| Magnolia-Carencro Village | 315 | 0 (not detected) |
| Magnolia-Coach House Manor | 315 | 3 ppb |
| Magnolia-Belleville Subdivision | 282 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; St. Louis, MO 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 Magnolia-Le Triomphe Subdivision 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. Size matters more than most people expect: small vs large water systems.