Hillsdale Pwa, OK
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 11.2 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. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Who runs the water here
Hillsdale Pwa serves about 110 people through 75 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 Garfield County, Oklahoma. EPA system ID: OK3002404; phone on file: 580-635-2245. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is up 11.2 ppb from 0 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Hillsdale Pwa is 25.2 ppb across 20 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 11.2 ppb over 10 |
| 2025 | 0 (not detected) |
| 2025 | 2.6 ppb |
| 2024 | 3.3 ppb |
| 2024 | 5.2 ppb |
| 2023 | 0 (not detected) |
| 2023 | 1.4 ppb |
| 2022 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2020 | 25.2 ppb over 15 |
| 2019 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2017 | 20.6 ppb over 15 |
| 2016 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Hillsdale Pwa 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. Hillsdale Pwa's 11.2 ppb sits at the 98th percentile in Oklahoma and the 98th nationally (higher means more lead).
Other water systems in Garfield County
20 other systems share Garfield County; 0 of them have a higher latest lead result than Hillsdale Pwa. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Enid | 49,347 | 5.1 ppb |
| Vance Afb | 3,231 | 0 (not detected) |
| Garfield Co Rwd #5 | 1,980 | 2 ppb |
| Waukomis Pwa | 1,366 | 6.8 ppb |
| Garfield Co Rwd #6 | 1,225 | 1.1 ppb |
| Garber Municipal Authority | 725 | 1.1 ppb |
| Highpoint Mhp | 600 | 10.7 ppb |
| Lahoma Pwa | 577 | 0 (not detected) |
| Covington | 553 | 1.2 ppb |
| Drummond | 405 | 1.7 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Hillsdale, 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 Hillsdale 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. See what changes at 10 ppb in 2027.