Hilton Sound (Sc3250024), MO
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 11 ppb (monitoring period 2026-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
About Hilton Sound (Sc3250024)
Hilton Sound (Sc3250024) serves about 50 people through 18 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Lexington County, Missouri. EPA system ID: SC3250024; phone on file: 314-380-8535. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is up 8 ppb from 3 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Hilton Sound (Sc3250024) is 187 ppb across 17 monitoring periods, 5 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 11 ppb over 10 |
| 2025 | 3 ppb |
| 2025 | 13 ppb over 10 |
| 2024 | 6 ppb |
| 2024 | 12 ppb over 10 |
| 2022 | 8 ppb |
| 2022 | 32 ppb over 15 |
| 2021 | 34 ppb over 15 |
| 2021 | 13 ppb over 10 |
| 2020 | 8 ppb |
| 2019 | 11 ppb over 10 |
| 2019 | 11 ppb over 10 |
| 2018 | 13 ppb over 10 |
| 2018 | 15 ppb over 10 |
| 2017 | 46 ppb over 15 |
| 2016 | 42 ppb over 15 |
| 2016 | 187 ppb over 15 |
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. Hilton Sound (Sc3250024)'s 11 ppb sits at the 99th percentile in Missouri and the 98th nationally (higher means more lead).
Neighbouring systems
6 other systems share Lexington County; 0 of them have a higher latest lead result than Hilton Sound (Sc3250024). If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Ridge Pointe S/D (Sc3250105) | 336 | 6 ppb |
| Rockford Place-Charwood (Sc3250099) | 277 | 0 (not detected) |
| Murray Hill Estates (Sc3250014) | 134 | 2 ppb |
| Chasehunt Farms (Sc3250104) | 75 | 7 ppb |
| Shealy Estates Iii (Sc3250102) | 70 | 6 ppb |
| Lakeside Forest 2 (Sc3250030) | 43 | 2 ppb |
What to do in your house
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 Hilton Sound (Sc3250024) whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 2120 ppb (copper action level 1,300 ppb).
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. See what changes at 10 ppb in 2027.