Atchison County Pwsd 1, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 5.57 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.
Who runs the water here
Atchison County Pwsd 1 serves about 700 people through 287 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Atchison County, Missouri. EPA system ID: MO1024009; phone on file: 660-744-5365. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 5.57 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Atchison County Pwsd 1 is 5.57 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 5.57 ppb |
| 2022 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2016 | 1.24 ppb |
How Atchison County Pwsd 1 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. Atchison County Pwsd 1's 5.57 ppb sits at the 93rd percentile in Missouri and the 92nd nationally (higher means more lead).
Other water systems in Atchison County
5 other systems share Atchison County; 0 of them have a higher latest lead result than Atchison County Pwsd 1. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Tarkio Board Of Public Works Pws | 1,494 | 0 (not detected) |
| Rock Port Pws | 1,318 | 1.07 ppb |
| Fairfax Pws | 638 | 0 (not detected) |
| Westboro Pws | 115 | 4.7 ppb |
| Atchison County Wholesale Water Comm | 25 | - |
Next steps for Rock Port, MO
Test your own tap with a certified lab first-draw sample; Rock Port, 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 Atchison County Pwsd 1 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. Size matters more than most people expect: small vs large water systems.