Stonewall Pwa, OK
Lead detected, under the action levels
Latest 90th-percentile lead: 1.25 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. 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.
Stonewall Pwa at a glance
Stonewall Pwa serves about 465 people through 232 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 Pontotoc County, Oklahoma. EPA system ID: OK2006203; phone on file: 405-514-7820. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Stonewall Pwa's lead record
Against the period ending 2025 (0.54 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Stonewall Pwa is 13.2 ppb across 5 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.25 ppb |
| 2025 | 0.54 ppb |
| 2022 | 13.2 ppb over 10 |
| 2019 | 3.97 ppb |
| 2016 | 4.83 ppb |
Where this result ranks
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. Stonewall Pwa's 1.25 ppb sits at the 59th percentile in Oklahoma and the 60th nationally (higher means more lead).
Nearby utilities
9 other systems share Pontotoc County; 6 of them have a higher latest lead result than Stonewall Pwa. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Ada | 22,600 | 1.74 ppb |
| Pontotoc Co Rwd # 7 | 4,863 | 1.8 ppb |
| Pontotoc Co Rwd # 8 | 4,250 | 2.26 ppb |
| Pontotoc Co Rwd # 9 | 1,162 | 2.53 ppb |
| Allen Pwa | 937 | 0.97 ppb |
| Pontotoc Co Rwd # 6 (Fittstown) | 896 | 6.99 ppb |
| Roff | 800 | 0.93 ppb |
| Pontotoc Co Rwd # 1 (Homer) | 441 | 2.28 ppb |
| Francis | 390 | 1.15 ppb |
Next steps for Stonewall, OK
Test your own tap with a certified lab first-draw sample; Stonewall, 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 Stonewall 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. 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.