Oak Hills Wsc, TX
Lead detected, under the action levels
Latest 90th-percentile lead: 2.2 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.
Who runs the water here
Oak Hills Wsc serves about 6,225 people through 2,075 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 groundwater, in Wilson County, Texas. EPA system ID: TX2470009; phone on file: 830-393-7739. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is up 1.2 ppb from 1 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Oak Hills Wsc is 2.2 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.2 ppb |
| 2022 | 1 ppb |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
Against other Texas systems
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. Oak Hills Wsc's 2.2 ppb sits at the 85th percentile in Texas and the 75th nationally (higher means more lead).
Neighbouring systems
11 other systems share Wilson County; 2 of them have a higher latest lead result than Oak Hills Wsc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Ss Wsc | 20,826 | 1.26 ppb |
| City Of Floresville | 8,306 | 0 (not detected) |
| Sunko Wsc | 5,064 | 1.08 ppb |
| Picosa Wsc | 3,210 | 1.1 ppb |
| City Of Poth | 2,994 | 0.5 ppb |
| City Of La Vernia | 2,526 | 2.4 ppb |
| Eagle Creek Ranch | 2,409 | 1.3 ppb |
| Three Oaks Wsc | 2,007 | 0 (not detected) |
| City Of Stockdale | 1,201 | 0.5 ppb |
| Creekwood Estates | 876 | 0 (not detected) |
Next steps for Floresville, TX
Test your own tap with a certified lab first-draw sample; Floresville, 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 Oak Hills Wsc 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. Systems that went over once often dip back under; here is what that means.