Geronimo, OK
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2026-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Geronimo
Geronimo serves about 1,200 people through 559 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 surface water, in Comanche County, Oklahoma. EPA system ID: OK3001680; phone on file: 580-353-5511. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is down 2.44 ppb from 2.44 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Geronimo is 18.5 ppb across 7 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 2.44 ppb |
| 2025 | 3.52 ppb |
| 2025 | 3.52 ppb |
| 2024 | 18.5 ppb over 15 |
| 2021 | 1.51 ppb |
| 2018 | 0 (not detected) |
Against other Oklahoma systems
Of the 870 Oklahoma systems with a lead result, the median latest reading is 0.81 ppb; 6 are over 15 ppb right now and 66 have gone over at some point. Geronimo's reported as 0 (not detected) sits at the 28th percentile in Oklahoma and the 28th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Comanche County
22 other systems share Comanche County; 17 of them have a higher latest lead result than Geronimo. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Lawton | 92,757 | 1.6 ppb |
| Fort Sill Hqusafacfs | 23,000 | 1.16 ppb |
| Elgin Pwa | 3,300 | 0 (not detected) |
| Comanche Co Rwd #4 | 3,000 | 1.53 ppb |
| Comanche Co Rwd #1 | 2,800 | 0 (not detected) |
| Cache | 2,371 | 0 (not detected) |
| Comanche Co Rwd #3 | 2,325 | 3.33 ppb |
| Comanche Co Rwd #2 | 1,840 | 1.12 ppb |
| Fletcher | 1,022 | 0 (not detected) |
| Pecan Valley Rwd | 1,000 | 4.06 ppb |
Next steps for Geronimo, OK
Test your own tap with a certified lab first-draw sample; Geronimo, OK 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 Geronimo 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. Why an old exceedance still matters: over the limit before, under it now.