Poison Spider I&S District, WY
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2021-2023). 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
Poison Spider I&S District serves about 200 people through 93 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Natrona County, Wyoming. EPA system ID: WY5600073; phone on file: 307-267-4628. They can tell you what your service line is made of and whether they pay to replace it.
Poison Spider I&S District's lead record
Against the period ending 2020 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Poison Spider I&S District is 1 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2017 | 1 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. Poison Spider I&S District's reported as 0 (not detected) sits at the 16th percentile in Wyoming and the 15th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Natrona County
20 other systems share Natrona County; 13 of them have a higher latest lead result than Poison Spider I&S District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Casper, City Of | 59,000 | 1 ppb |
| Mills, City Of | 4,050 | 0 (not detected) |
| Bar Nunn, Town Of | 4,000 | 0 (not detected) |
| Evansville, Town Of | 2,873 | 2 ppb |
| Vista West Water Company | 1,600 | 2 ppb |
| Pioneer Water & Sewer District | 1,500 | 2 ppb |
| Sandy Lake Estates I&S District | 450 | 0 (not detected) |
| Natrona County Int'L Airport | 423 | 0 (not detected) |
| Midwest, Town Of | 325 | 2 ppb |
| Air Base Acres I&S District | 236 | 0 (not detected) |
Your move
Look up your address in Poison Spider I&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 Poison Spider I&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. The lead result guide covers how utilities pick the homes they sample. Small systems behave differently: why small systems go over more often.