Newcastle, City Of, WY
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (monitoring period 2026-2026). 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.
Who runs the water here
Newcastle, City Of serves about 3,595 people through 1,572 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Weston County, Wyoming. EPA system ID: WY5600256; phone on file: 307-746-6208. 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 2025 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Newcastle, City Of is 3 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1 ppb |
| 2025 | 1 ppb |
| 2024 | 3 ppb |
| 2023 | 3 ppb |
| 2021 | 2 ppb |
| 2020 | 2 ppb |
| 2017 | 1 ppb |
How Newcastle, City Of 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. Newcastle, City Of's 1 ppb sits at the 52nd percentile in Wyoming and the 54th nationally (higher means more lead).
Nearby utilities
8 other systems share Weston County; 2 of them have a higher latest lead result than Newcastle, City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Upton, Town Of | 1,100 | 4 ppb |
| Salt Creek Water District | 600 | 0 (not detected) |
| West End Water District | 225 | 1 ppb |
| Osage Water District | 200 | 3 ppb |
| Cambria I&S District | 148 | 0 (not detected) |
| Water Unlimited, Incorporated | 144 | 0 (not detected) |
| Canyon Improvement & Service District | 79 | 1 ppb |
| Sunset Ranch Water District | 70 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Newcastle, 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 Newcastle, City Of 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.