Red Rock, OK
Lead reported as not detected
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 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Who runs the water here
Red Rock serves about 293 people through 90 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 Noble County, Oklahoma. EPA system ID: OK2005202; phone on file: 580-723-4470. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is down 1.3 ppb from 1.3 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Red Rock is 13.4 ppb across 11 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 1.3 ppb |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2022 | 6.4 ppb |
| 2021 | 13.4 ppb over 10 |
| 2019 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2017 | 7.8 ppb |
How Red Rock 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. Red Rock's reported as 0 (not detected) sits at the 12th percentile in Oklahoma and the 18th 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 Noble County; 8 of them have a higher latest lead result than Red Rock. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Perry Water & Light Dept | 5,230 | 6 ppb |
| Noble County Rwd #2 | 2,100 | 2.2 ppb |
| Morrison Public Works Auth. | 950 | 2.2 ppb |
| Billings Pwa | 436 | 12.7 ppb |
| Noble Co Rwd #1 (Lucien) | 335 | 0 (not detected) |
| Marland | 325 | 3.3 ppb |
| Otoe-Missouria Tribe | 250 | 1.3 ppb |
| Noble Co Rwd #3 | 250 | 0.7 ppb |
| Noble Co Rwd # 4 | 142 | 2.7 ppb |
What to do in your house
Look up your address in Red Rock's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Red Rock whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1490 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. The lead result guide covers how utilities pick the homes they sample. Small systems behave differently: why small systems go over more often.