Mo American Joplin, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 4 ppb (monitoring period 2023-2025). 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
Mo American Joplin serves about 73,728 people through 26,709 service connections, which makes it a large system under EPA's size classes. It is privately owned and draws surface water, in Jasper County, Missouri. EPA system ID: MO5010413; phone on file: 417-680-0314. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2024 (5 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Mo American Joplin is 6 ppb across 9 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4 ppb |
| 2024 | 5 ppb |
| 2022 | 6 ppb |
| 2022 | 2 ppb |
| 2022 | 4 ppb |
| 2020 | 2 ppb |
| 2019 | 4 ppb |
| 2017 | 4 ppb |
| 2016 | 3 ppb |
How Mo American Joplin 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. Mo American Joplin's 4 ppb sits at the 88th percentile in Missouri and the 88th nationally (higher means more lead).
Neighbouring systems
16 other systems share Jasper County; 0 of them have a higher latest lead result than Mo American Joplin. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Carthage Pws | 14,600 | 1.86 ppb |
| Webb City Pws | 13,404 | 3.58 ppb |
| Carl Junction Pws | 8,142 | 1.47 ppb |
| Jasper County Pwsd 1 | 5,500 | 2.82 ppb |
| Jasper County Pwsd 2 | 3,383 | 0 (not detected) |
| Oronogo Pws | 2,719 | 1.24 ppb |
| Carterville Pws | 1,982 | 1.64 ppb |
| Jasper County Pwsd 3 | 1,900 | 0 (not detected) |
| Sarcoxie Pws | 1,539 | 3.35 ppb |
| Duenweg Pws | 1,469 | 3 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Joplin, 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 Mo American Joplin 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. Systems that went over once often dip back under; here is what that means.