Corn Pwa, OK
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2025). 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.
Corn Pwa at a glance
Corn Pwa serves about 500 people through 256 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 Washita County, Oklahoma. EPA system ID: OK2007501; phone on file: 580-343-2255. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2024 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Corn Pwa is 15.6 ppb across 8 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 15.6 ppb over 15 |
| 2019 | 0 (not detected) |
| 2016 | 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. Corn Pwa's reported as 0 (not detected) sits at the 19th percentile in Oklahoma and the 22nd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
9 other systems share Washita County; 3 of them have a higher latest lead result than Corn Pwa. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| New Cordell Utility Authority | 2,903 | 0 (not detected) |
| Burns Flat Pws | 2,057 | 0 (not detected) |
| Washita Co Rwd #2 | 1,032 | 3.87 ppb |
| Sentinel Pws | 859 | 0.64 ppb |
| Dill City | 526 | 5.1 ppb |
| Canute | 524 | 0 (not detected) |
| Rocky | 202 | 0 (not detected) |
| Bessie | 190 | 0 (not detected) |
| Foss | 127 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Corn, 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 Corn Pwa 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. More in what a past exceedance means today.