J-W Subdivision Association, WY
Lead detected, under the action levels
Latest 90th-percentile lead: 4 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.
J-W Subdivision Association at a glance
J-W Subdivision Association serves about 40 people through 16 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Teton County, Wyoming. EPA system ID: WY5600877; phone on file: 307-690-1998. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2024 (3 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for J-W Subdivision Association is 5 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4 ppb |
| 2024 | 3 ppb |
| 2023 | 2 ppb |
| 2022 | 5 ppb |
| 2021 | 3 ppb |
| 2018 | 4 ppb |
How J-W Subdivision Association compares
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. J-W Subdivision Association's 4 ppb sits at the 87th percentile in Wyoming and the 87th nationally (higher means more lead).
Other water systems in Teton County
37 other systems share Teton County; 3 of them have a higher latest lead result than J-W Subdivision Association. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Jackson, Town Of | 24,760 | 1 ppb |
| Ynp-Old Faithful | 7,745 | 2 ppb |
| Ynp - Lake Village | 5,925 | 4 ppb |
| Gtnp-Colter Bay Village | 4,514 | 1 ppb |
| Gtnp-Jackson Lake Lodge | 1,830 | 2 ppb |
| Rafter J Subdivision Hoa | 1,500 | 3 ppb |
| Aspens Pines W&S District | 1,400 | 2 ppb |
| Teton Village Water & Sewer District | 906 | 2 ppb |
| Melody Ranch Improvement & Service Dist. | 900 | 5 ppb |
| Spring Creek Improvement District | 400 | 3 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Jackson, 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 J-W Subdivision Association 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.