Block House Mud, TX
Lead detected, under the action levels
Latest 90th-percentile lead: 1.04 ppb (monitoring period 2024-2026). 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.
Block House Mud at a glance
Block House Mud serves about 6,618 people through 2,206 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: TX2460110; phone on file: 512-259-6512. They can tell you what your service line is made of and whether they pay to replace it.
Block House Mud's lead record
Against the period ending 2023 (0.84 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Block House Mud is 1.15 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.04 ppb |
| 2023 | 0.84 ppb |
| 2020 | 0.64 ppb |
| 2017 | 1.15 ppb |
Where this result ranks
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. Block House Mud's 1.04 ppb sits at the 66th percentile in Texas and the 56th nationally (higher means more lead).
Neighbouring systems
38 other systems share Williamson County; 23 of them have a higher latest lead result than Block House 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) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Leander, 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 Block House 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.