Mcclain Co Rwd # 8, OK
Exceeded the action level in the past
Latest 90th-percentile lead: 6.98 ppb (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.
Who runs the water here
Mcclain Co Rwd # 8 serves about 1,897 people through 815 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 groundwater, in Mcclain County, Oklahoma. EPA system ID: OK2004711; phone on file: 405-449-7700. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is up 3.6 ppb from 3.38 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Mcclain Co Rwd # 8 is 38 ppb across 12 monitoring periods, 3 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 6.98 ppb |
| 2025 | 3.38 ppb |
| 2025 | 2.4 ppb |
| 2024 | 3.88 ppb |
| 2023 | 38 ppb over 15 |
| 2022 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2018 | 24.9 ppb over 15 |
| 2018 | 0 (not detected) |
| 2017 | 24.9 ppb over 15 |
How Mcclain Co Rwd # 8 compares
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. Mcclain Co Rwd # 8's 6.98 ppb sits at the 96th percentile in Oklahoma and the 94th nationally (higher means more lead).
Neighbouring systems
11 other systems share Mcclain County; 1 of them has a higher latest lead result than Mcclain Co Rwd # 8. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Newcastle | 7,900 | 22.5 ppb |
| Purcell | 6,693 | 0 (not detected) |
| Blanchard | 2,966 | 0 (not detected) |
| Goldsby Water Auth Trust | 2,000 | 0 (not detected) |
| Wayne | 688 | 1.98 ppb |
| Washington | 600 | 4.48 ppb |
| Dibble | 550 | 0 (not detected) |
| Cole | 473 | 0.9 ppb |
| Byars | 275 | 4.87 ppb |
| Mcclain County Rw & Sd #9 | 250 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Wayne, 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 Mcclain Co Rwd # 8 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. More in what a past exceedance means today.