Fern Bluff Mud, TX
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2023-2025). 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
Fern Bluff Mud serves about 5,682 people through 1,897 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 surface water, in Williamson County, Texas. EPA system ID: TX2460128. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Fern Bluff Mud is 0 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
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. Fern Bluff Mud's reported as 0 (not detected) sits at the 43rd percentile in Texas and the 35th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Williamson County
38 other systems share Williamson County; 25 of them have a higher latest lead result than Fern Bluff Mud. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Georgetown | 191,639 | 4.81 ppb |
| City Of Round Rock | 130,662 | 5.05 ppb |
| City Of Leander | 98,330 | 1.1 ppb |
| City Of Cedar Park | 86,939 | 2.77 ppb |
| Jonah Water Sud | 29,861 | 1.55 ppb |
| City Of Hutto | 29,580 | 0 (not detected) |
| City Of Taylor | 20,622 | 1.93 ppb |
| Brushy Creek Mud | 18,314 | 1.28 ppb |
| Sonterra Mud | 16,614 | 0.43 ppb |
| Jarrell Schwertner Wsc | 9,681 | 0 (not detected) |
Next steps for Round Rock, TX
Look up your address in Fern Bluff Mud'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 Fern Bluff Mud 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.