St Marys Seminary, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 1.71 ppb (monitoring period 2024-2026). 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.
Who runs the water here
St Marys Seminary serves about 60 people through 1 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Perry County, Missouri. EPA system ID: MO4069016; phone on file: 573-547-6533. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 3.19 ppb from 4.9 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for St Marys Seminary is 5.83 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.71 ppb |
| 2025 | 4.9 ppb |
| 2023 | 4.9 ppb |
| 2022 | 5.83 ppb |
| 2020 | 5.83 ppb |
| 2019 | 1.77 ppb |
| 2017 | 1.77 ppb |
| 2016 | 2.43 ppb |
How St Marys Seminary 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. St Marys Seminary's 1.71 ppb sits at the 65th percentile in Missouri and the 67th nationally (higher means more lead).
Other water systems in Perry County
9 other systems share Perry County; 6 of them have a higher latest lead result than St Marys Seminary. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Perryville Pws | 8,555 | 1.92 ppb |
| Perry County Pwsd 1 | 2,065 | 0 (not detected) |
| Port Perry Service | 800 | 0 (not detected) |
| Perry County Pwsd 2 | 750 | 0 (not detected) |
| S K & M Water And Sewer Company | 750 | 6.41 ppb |
| Altenburg Pws | 341 | 3.46 ppb |
| Mill Spring | 250 | 3.51 ppb |
| Lake Kah Tan Da Estates Inc | 158 | 3.46 ppb |
| Farrar Water Assn | 34 | 3.39 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Perryville, 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 St Marys Seminary 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. Systems that went over once often dip back under; here is what that means.