Ionia Pws, MO
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Who runs the water here
Ionia Pws serves about 88 people through 44 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Benton County, Missouri. EPA system ID: MO3010400; phone on file: 417-399-9108. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is down 1.42 ppb from 1.42 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Ionia Pws is 1.42 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 1.42 ppb |
| 2023 | 1.42 ppb |
| 2022 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2016 | 1.35 ppb |
How Ionia Pws 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. Ionia Pws's reported as 0 (not detected) sits at the 7th percentile in Missouri and the 8th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
24 other systems share Benton County; 18 of them have a higher latest lead result than Ionia Pws. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Warsaw Pws | 2,402 | 2.56 ppb |
| Cole Camp Pws | 1,150 | 1.11 ppb |
| Lincoln Pws | 1,100 | 0 (not detected) |
| Sterett Creek Village | 505 | 0.6 ppb |
| Mo American Whitebranch Subd | 450 | 1 ppb |
| Winegars Teal Bend Subd | 400 | 7 ppb |
| Spring Branch Water | 273 | 0 (not detected) |
| Sycamore Valley Subd | 245 | 0.76 ppb |
| Keithley Beach Subd | 240 | 1.74 ppb |
| Blue Branch Improvement Assn Inc | 200 | 1.77 ppb |
What to do in your house
Look up your address in Ionia Pws's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Ionia Pws 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. Small systems behave differently: why small systems go over more often.