Hamilton Estates Water System, TX
Lead detected, under the action levels
Latest 90th-percentile lead: 4.5 ppb (monitoring period 2025-2025). 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.
Who runs the water here
Hamilton Estates Water System serves about 123 people through 41 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Harris County, Texas. EPA system ID: TX1012916; phone on file: 903-822-3275. They can tell you what your service line is made of and whether they pay to replace it.
Hamilton Estates Water System's lead record
The highest 90th-percentile result EPA holds for Hamilton Estates Water System is 4.5 ppb across 1 monitoring period, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4.5 ppb |
How Hamilton Estates Water System 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. Hamilton Estates Water System's 4.5 ppb sits at the 96th percentile in Texas and the 89th nationally (higher means more lead).
Neighbouring systems
690 other systems share Harris County; 27 of them have a higher latest lead result than Hamilton Estates Water System. 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 |
Next steps for Collinsville, TX
Test your own tap with a certified lab first-draw sample; Collinsville, 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 Hamilton Estates Water System 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. The action level is dropping - the 10 ppb rule from 2027.