Mo American Ironton, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 1 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.
About Mo American Ironton
Mo American Ironton serves about 1,460 people through 782 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws surface water, in Iron County, Missouri. EPA system ID: MO4010402; phone on file: 314-548-0199. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Mo American Ironton's lead record
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Mo American Ironton is 1.87 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2022 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 1.87 ppb |
| 2019 | 1.87 ppb |
| 2016 | 1.39 ppb |
| 2016 | 1.39 ppb |
Against other Missouri systems
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 Ironton's 1 ppb sits at the 49th percentile in Missouri and the 54th nationally (higher means more lead).
Other water systems in Iron County
8 other systems share Iron County; 7 of them have a higher latest lead result than Mo American Ironton. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Pilot Knob Rural Wd 1 N & S | 839 | 2.34 ppb |
| Pilot Knob Pws | 746 | 2.44 ppb |
| Viburnum Pws | 639 | 1.61 ppb |
| Arcadia Pws | 607 | 2.59 ppb |
| Annapolis Pws | 300 | 1.54 ppb |
| Killarney Shores Subd | 203 | 0 (not detected) |
| Belleview Valley Nursing Home | 140 | 1.1 ppb |
| Baptist Home | 110 | 5.67 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Chesterfield, 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 Ironton 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. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.