Sierra West Subdivision, TX
Exceeded the action level in the past
Latest 90th-percentile lead: 2 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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Sierra West Subdivision
Sierra West Subdivision serves about 495 people through 165 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Hays County, Texas. EPA system ID: TX1050134; phone on file: 512-990-4400. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Sierra West Subdivision's lead record
That is down 4.94 ppb from 6.94 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Sierra West Subdivision is 16 ppb across 6 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2 ppb |
| 2025 | 6.94 ppb |
| 2024 | 1 ppb |
| 2023 | 1.4 ppb |
| 2023 | 1.8 ppb |
| 2022 | 16 ppb over 15 |
Against other Texas systems
Of the 4,447 Texas systems with a lead result, the median latest reading is 0.28 ppb; 15 are over 15 ppb right now and 202 have gone over at some point. Sierra West Subdivision's 2 ppb sits at the 82nd percentile in Texas and the 71st nationally (higher means more lead).
Nearby utilities
49 other systems share Hays County; 10 of them have a higher latest lead result than Sierra West Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of San Marcos | 72,970 | 1.63 ppb |
| City Of Kyle | 52,000 | 1.91 ppb |
| Texas State University - San Marcos | 43,552 | 1.3 ppb |
| Goforth Sud | 34,893 | 0 (not detected) |
| County Line Sud | 19,609 | 0 (not detected) |
| City Of Buda | 13,830 | 1.46 ppb |
| Dripping Springs Wsc | 8,037 | 1.89 ppb |
| Plum Creek | 7,065 | 1.24 ppb |
| Wimberley Wsc | 5,334 | 2.08 ppb |
| Hays County Wcid 2 | 3,381 | 2.88 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Austin, TX 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 Sierra West Subdivision 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. Why an old exceedance still matters: over the limit before, under it now.