Montgomery County Mud 166, 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.
About Montgomery County Mud 166
Montgomery County Mud 166 serves about 1,443 people through 481 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Montgomery County, Texas. EPA system ID: TX1700903; phone on file: 713-860-6400. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2022 (0.8 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Montgomery County Mud 166 is 0.8 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0.8 ppb |
| 2022 | 0 (not detected) |
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. Montgomery County Mud 166's reported as 0 (not detected) sits at the 30th percentile in Texas and the 29th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Montgomery County
332 other systems share Montgomery County; 149 of them have a higher latest lead result than Montgomery County Mud 166. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Conroe | 113,912 | 0 (not detected) |
| Porter Special Utility District | 26,388 | 0.59 ppb |
| Montgomery Trace Water System | 25,917 | 0.41 ppb |
| Montgomery County Mud 46 | 24,399 | 2.31 ppb |
| Montgomery County Mud 47 | 24,171 | 0.7 ppb |
| Montgomery County Mud 67 | 16,821 | 0.83 ppb |
| Montgomery County Mud 60 | 15,036 | 3.16 ppb |
| New Caney Mud | 14,307 | 1.54 ppb |
| City Of Willis | 14,133 | 0.7 ppb |
| Southern Montgomery County Mud | 13,372 | 0 (not detected) |
Next steps for Houston, TX
Look up your address in Montgomery County Mud 166'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 Montgomery County Mud 166 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Small systems behave differently: why small systems go over more often.