Greenfield Pwa, OK
Above the federal action level
Latest 90th-percentile lead: 30.1 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. In the most recent monitoring period, more than 10% of the sampled homes measured above 15 ppb. Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking now, and test your own tap.
About Greenfield Pwa
Greenfield Pwa serves about 123 people through 73 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 Blaine County, Oklahoma. EPA system ID: OK3000606; phone on file: 580-623-3428. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is up 23.5 ppb from 6.6 ppb in the period ending 2018. The highest 90th-percentile result EPA holds for Greenfield Pwa is 30.1 ppb across 2 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 30.1 ppb over 15 |
| 2018 | 6.6 ppb |
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. Greenfield Pwa's 30.1 ppb sits at the 100th percentile in Oklahoma and the 100th nationally (higher means more lead).
Nearby utilities
7 other systems share Blaine County; 0 of them have a higher latest lead result than Greenfield Pwa. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Watonga | 2,816 | 1.8 ppb |
| Geary | 1,258 | 0 (not detected) |
| Okeene | 1,240 | 3.5 ppb |
| North Blaine Water Corp | 960 | 11.6 ppb |
| Canton | 650 | 0 (not detected) |
| Longdale | 363 | 0 (not detected) |
| Hitchcock Public Works Auth. | 141 | 1.2 ppb |
What to do in your house
Use a filter certified to NSF/ANSI 53 for lead on the tap you drink and cook from, now, before you test. Then test your own tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Greenfield 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. Why sampled homes are the worst-case ones is in the guide to reading the number. The action level is dropping - the 10 ppb rule from 2027.