Horizon West Subdivision, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 4.44 ppb (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. 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 Horizon West Subdivision
Horizon West Subdivision serves about 75 people through 25 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Stone County, Missouri. EPA system ID: MO5031284; phone on file: 573-747-7523. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 2.56 ppb from 1.88 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Horizon West Subdivision is 4.44 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 4.44 ppb |
| 2021 | 1.88 ppb |
| 2021 | 1.88 ppb |
| 2018 | 3.4 ppb |
| 2017 | 1.46 ppb |
| 2016 | 3.09 ppb |
| 2016 | 3.83 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. Horizon West Subdivision's 4.44 ppb sits at the 90th percentile in Missouri and the 89th nationally (higher means more lead).
Neighbouring systems
87 other systems share Stone County; 12 of them have a higher latest lead result than Horizon West Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Mo American Stonebridge Village | 2,100 | 0 (not detected) |
| Stone County Pwsd 1 | 2,052 | 2.13 ppb |
| Pwsd 2 Of Stone County 265 | 1,535 | 2.59 ppb |
| Crane Pws | 1,495 | 2.59 ppb |
| Mo Ark Water Co | 1,478 | 1.52 ppb |
| Reeds Spring Pws | 1,287 | 0 (not detected) |
| Mo American Ozark Mtn Water Company 2 | 583 | 7 ppb |
| Twin Island Estates | 525 | 4.58 ppb |
| Ocwc Lantern Bay | 502 | 3.54 ppb |
| Galena Pws | 500 | 1.01 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Branson West, 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 Horizon West 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. What a 90th-percentile result does and does not tell you: how to read a lead result. The action level is dropping - the 10 ppb rule from 2027.