Thirsty Water Corp, OK
Lead detected, under the action levels
Latest 90th-percentile lead: 0.9 ppb (monitoring period 2025-2025). 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.
Who runs the water here
Thirsty Water Corp serves about 81 people through 176 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 Greer County, Oklahoma. EPA system ID: OK2002806; phone on file: 580-688-3342. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2024 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Thirsty Water Corp is 12.1 ppb across 11 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.9 ppb |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2019 | 12.1 ppb over 10 |
| 2018 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2016 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Thirsty Water Corp 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. Thirsty Water Corp's 0.9 ppb sits at the 51st percentile in Oklahoma and the 49th nationally (higher means more lead).
Neighbouring systems
6 other systems share Greer County; 4 of them have a higher latest lead result than Thirsty Water Corp. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Mangum Pws | 2,924 | 1.25 ppb |
| Granite Pws | 1,425 | 1.19 ppb |
| Oklahoma State Reformatory | 999 | 0 (not detected) |
| Harmon Electric | 188 | 1 ppb |
| Reed Water Corp | 175 | 2.27 ppb |
| Willow | 114 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Hollis, 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 Thirsty Water Corp 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. Size matters more than most people expect: small vs large water systems.