Montgomery County Mud 99, TX
Lead detected, under the action levels
Latest 90th-percentile lead: 1.17 ppb (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. 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 Montgomery County Mud 99
Montgomery County Mud 99 serves about 3,675 people through 1,225 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 Montgomery County, Texas. EPA system ID: TX1700749; phone on file: 713-652-6500. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2022 (1.38 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Montgomery County Mud 99 is 3.03 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.17 ppb |
| 2022 | 1.38 ppb |
| 2019 | 2.94 ppb |
| 2018 | 3.03 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. Montgomery County Mud 99's 1.17 ppb sits at the 68th percentile in Texas and the 58th nationally (higher means more lead).
Nearby utilities
332 other systems share Montgomery County; 74 of them have a higher latest lead result than Montgomery County Mud 99. 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) |
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 Montgomery County Mud 99 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. The action level is dropping - the 10 ppb rule from 2027.