Cedar Oak Mesa Wsc, TX
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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
Cedar Oak Mesa Wsc serves about 497 people through 203 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Hays County, Texas. EPA system ID: TX1050031. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Cedar Oak Mesa Wsc is 1 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 1 ppb |
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. Cedar Oak Mesa Wsc's reported as 0 (not detected) sits at the 20th percentile in Texas and the 22nd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
49 other systems share Hays County; 38 of them have a higher latest lead result than Cedar Oak Mesa Wsc. 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
Look up your address in Cedar Oak Mesa Wsc'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 Cedar Oak Mesa Wsc 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. A zero today does not rule out a jump later - the rules are tightening in 2027.