Shell Town Water Improvement District, WY
Lead detected, under the action levels
Latest 90th-percentile lead: 5 ppb (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. 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.
Shell Town Water Improvement District at a glance
Shell Town Water Improvement District serves about 120 people through 33 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Big Horn County, Wyoming. EPA system ID: WY5600205; phone on file: 307-765-2289. 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 2022 (6 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Shell Town Water Improvement District is 6 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 5 ppb |
| 2022 | 6 ppb |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
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. Shell Town Water Improvement District's 5 ppb sits at the 93rd percentile in Wyoming and the 91st nationally (higher means more lead).
Nearby utilities
14 other systems share Big Horn County; 1 of them has a higher latest lead result than Shell Town Water Improvement 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 |
| South End Water Users S&I District | 150 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Shell, 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 Shell Town Water Improvement 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. Systems that went over once often dip back under; here is what that means.