Harris County Mud 104, TX
Lead detected, under the action levels
Latest 90th-percentile lead: 3.27 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. 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.
About Harris County Mud 104
Harris County Mud 104 serves about 4,854 people through 1,618 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 Harris County, Texas. EPA system ID: TX1011534; phone on file: 713-652-6500. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is down 7.63 ppb from 10.9 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Harris County Mud 104 is 10.9 ppb across 7 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3.27 ppb |
| 2025 | 10.9 ppb over 10 |
| 2022 | 2.37 ppb |
| 2019 | 4.02 ppb |
| 2018 | 9.7 ppb |
| 2017 | 8.5 ppb |
| 2016 | 10 ppb |
How Harris County Mud 104 compares
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. Harris County Mud 104's 3.27 ppb sits at the 92nd percentile in Texas and the 84th nationally (higher means more lead).
Other water systems in Harris County
690 other systems share Harris County; 68 of them have a higher latest lead result than Harris County Mud 104. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Houston | 2,970,543 | 5 ppb |
| City Of Pasadena | 152,000 | 3.72 ppb |
| Clear Lake City Water Authority | 89,702 | 0.88 ppb |
| City Of Baytown | 86,004 | 2.1 ppb |
| City Of Houston Ud 5 - Kingwood | 80,073 | 0.51 ppb |
| Harris County Mud 165 | 40,503 | 1.3 ppb |
| City Of La Porte | 36,569 | 2.35 ppb |
| City Of Deer Park | 34,495 | 0 (not detected) |
| Northwest Harris County Mud 5 | 25,425 | 0 (not detected) |
| City Of Katy | 25,253 | 2.7 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Houston, 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 Harris County Mud 104 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. The lead result guide covers how utilities pick the homes they sample. Systems that went over once often dip back under; here is what that means.