South End Water Users S&I District, WY
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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 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.
South End Water Users S&I District at a glance
South End Water Users S&I District serves about 150 people through 50 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 Big Horn County, Wyoming. EPA system ID: WY5600970; phone on file: 307-548-2377. Call that number and ask whether your address has a lead, galvanized or unknown service line.
South End Water Users S&I District's lead record
That is down 3 ppb from 3 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for South End Water Users S&I District is 4 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 3 ppb |
| 2019 | 0 (not detected) |
| 2018 | 4 ppb |
Against other Wyoming systems
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 End Water Users S&I District's reported as 0 (not detected) sits at the 14th percentile in Wyoming and the 13th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
14 other systems share Big Horn County; 11 of them have a higher latest lead result than South End Water Users S&I District. 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 |
| South Big Horn County Jpb | 900 | 1 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 |
| Shell Town Water Improvement District | 120 | 5 ppb |
Next steps for Cowley, WY
Look up your address in South End Water Users S&I District'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 South End Water Users S&I District 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. Small systems behave differently: why small systems go over more often.