Sonterra Mud, TX
Lead detected, under the action levels
Latest 90th-percentile lead: 0.43 ppb (monitoring period 2022-2024). 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.
Sonterra Mud at a glance
Sonterra Mud serves about 16,614 people through 9,221 service connections, which makes it a large 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: TX2460157; phone on file: 512-630-6884. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Sonterra Mud's lead record
That is down 2.78 ppb from 3.21 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Sonterra Mud is 4.63 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0.43 ppb |
| 2021 | 3.21 ppb |
| 2021 | 3.21 ppb |
| 2020 | 3.39 ppb |
| 2019 | 1.3 ppb |
| 2018 | 2.76 ppb |
| 2017 | 4.63 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. Sonterra Mud's 0.43 ppb sits at the 52nd percentile in Texas and the 42nd nationally (higher means more lead).
Other water systems in Williamson County
38 other systems share Williamson County; 24 of them have a higher latest lead result than Sonterra 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 |
| Jarrell Schwertner Wsc | 9,681 | 0 (not detected) |
| City Of Liberty Hill | 8,777 | 2.11 ppb |
Next steps for Austin, TX
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 Sonterra 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. The action level is dropping - the 10 ppb rule from 2027.