South Big Horn County Jpb, WY
Exceeded the action level in the past
Latest 90th-percentile lead: 1 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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Who runs the water here
South Big Horn County Jpb serves about 900 people through 350 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Big Horn County, Wyoming. EPA system ID: WY5601454; phone on file: 307-347-4042. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for South Big Horn County Jpb is 16 ppb across 7 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2025 | 0 (not detected) |
| 2024 | 1 ppb |
| 2024 | 1 ppb |
| 2023 | 16 ppb over 15 |
| 2020 | 1 ppb |
| 2017 | 2 ppb |
Where this result ranks
Of the 311 Wyoming systems with a lead result, the median latest reading is 1 ppb; 0 are over 15 ppb right now and 16 have gone over at some point. South Big Horn County Jpb's 1 ppb sits at the 49th percentile in Wyoming and the 53rd nationally (higher means more lead).
Nearby utilities
14 other systems share Big Horn County; 6 of them have a higher latest lead result than South Big Horn County Jpb. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Lovell, Town Of | 2,250 | 0 (not detected) |
| Greybull, Town Of | 2,080 | 1 ppb |
| Basin, Town Of | 1,250 | 3 ppb |
| Cowley, Town Of | 800 | 3 ppb |
| Byron, Town Of | 561 | 0 (not detected) |
| Burlington, Town Of | 348 | 1 ppb |
| Deaver Municipal Water System | 176 | 0 (not detected) |
| Frannie, Town Of | 160 | 1 ppb |
| South End Water Users S&I District | 150 | 0 (not detected) |
| Shell Town Water Improvement District | 120 | 5 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Worland, WY 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 South Big Horn County Jpb 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. Why an old exceedance still matters: over the limit before, under it now.