Jamestown-Rio Vista W&S District, WY
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2023-2025). 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.
Who runs the water here
Jamestown-Rio Vista W&S District serves about 560 people through 194 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 surface water, in Sweetwater County, Wyoming. EPA system ID: WY5600810; phone on file: 307-875-9463. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Jamestown-Rio Vista W&S District is 1 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2018 | 1 ppb |
| 2017 | 1 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. Jamestown-Rio Vista W&S District's reported as 0 (not detected) sits at the 24th percentile in Wyoming and the 23rd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
20 other systems share Sweetwater County; 15 of them have a higher latest lead result than Jamestown-Rio Vista W&S District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Rock Springs, City Of | 24,000 | 3 ppb |
| Green River, City Of | 10,500 | 2 ppb |
| White Mountain W&S District | 3,000 | 2 ppb |
| Little America Hotels & Resorts, Inc- Wy | 2,004 | 4 ppb |
| Pioneer Mobile Home Park | 1,000 | 3 ppb |
| Clearview I&S District | 930 | 3 ppb |
| Farson Eden School | 530 | 3 ppb |
| Wamsutter, Town Of | 500 | 2 ppb |
| Lewis Mobile Home Park | 370 | 2 ppb |
| Superior, Town Of | 336 | 3 ppb |
Your move
Look up your address in Jamestown-Rio Vista W&S 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 Jamestown-Rio Vista W&S 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. What a 90th-percentile result does and does not tell you: how to read a lead result. A zero today does not rule out a jump later - the rules are tightening in 2027.