Washington Co Rwd #7, OK
Lead detected, under the action levels
Latest 90th-percentile lead: 1.3 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.
Washington Co Rwd #7 at a glance
Washington Co Rwd #7 serves about 258 people through 133 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 surface water, in Washington County, Oklahoma. EPA system ID: OK3007415; phone on file: 918-440-9638. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is down 3.4 ppb from 4.7 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Washington Co Rwd #7 is 13.3 ppb across 13 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.3 ppb |
| 2025 | 4.7 ppb |
| 2025 | 8.7 ppb |
| 2024 | 1.7 ppb |
| 2024 | 2.8 ppb |
| 2023 | 13.3 ppb over 10 |
| 2023 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2019 | 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. Washington Co Rwd #7's 1.3 ppb sits at the 60th percentile in Oklahoma and the 60th nationally (higher means more lead).
Nearby utilities
10 other systems share Washington County; 7 of them have a higher latest lead result than Washington Co Rwd #7. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Bartlesville | 34,748 | 3.6 ppb |
| Dewey Public Works Authority | 3,490 | 2.6 ppb |
| Washington Co Rwd #2 | 2,250 | 1.8 ppb |
| Washington Co Rwd #1 | 1,375 | 3.8 ppb |
| Washington Co Rwd #5 | 900 | 3.2 ppb |
| Le Ann Water | 750 | 1.2 ppb |
| Copan Pwa | 733 | 5.6 ppb |
| Ramona Public Works Authority | 564 | 2.7 ppb |
| Ochelata Utility Authority | 494 | 0 (not detected) |
| Bar-Dew Water Assoc Inc | 130 | 0 (not detected) |
Next steps for Dewey, OK
Test your own tap with a certified lab first-draw sample; Dewey, 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 Washington Co Rwd #7 whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1480 ppb (copper action level 1,300 ppb).
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. Size matters more than most people expect: small vs large water systems.