Potosi East, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 4.36 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.
Potosi East at a glance
Potosi East serves about 900 people through 4 service connections, which makes it a small system under EPA's size classes. It is owned by the state and draws groundwater, in Washington County, Missouri. EPA system ID: MO6069096; phone on file: 573-854-3898. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Potosi East's lead record
That is down 2.06 ppb from 6.42 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Potosi East is 6.42 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 4.36 ppb |
| 2022 | 6.42 ppb |
| 2021 | 6.42 ppb |
| 2021 | 6.42 ppb |
| 2019 | 2.09 ppb |
| 2018 | 2.09 ppb |
| 2018 | 2.09 ppb |
| 2016 | 1.26 ppb |
How Potosi East 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. Potosi East's 4.36 ppb sits at the 89th percentile in Missouri and the 89th nationally (higher means more lead).
Neighbouring systems
9 other systems share Washington County; 0 of them have a higher latest lead result than Potosi East. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Potosi Pws | 2,527 | 1.61 ppb |
| Washington County Pwsd 1 | 503 | 1.45 ppb |
| Irondale Pws | 420 | 1.9 ppb |
| Mo American Rogue Creek Utilities | 276 | 2 ppb |
| Mineral Point Pws | 231 | 2.06 ppb |
| Anthonies Mill Resort Subdivision | 214 | 0 (not detected) |
| Washington County Pwsd 2 | 175 | 1.4 ppb |
| Caledonia Pws | 130 | 0 (not detected) |
| The Legacy Ranch | 25 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Potosi, 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 Potosi East 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. Size matters more than most people expect: small vs large water systems.