Rio Ancho Subdivision, TX
Lead detected, under the action levels
Latest 90th-percentile lead: 2.41 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
Rio Ancho Subdivision serves about 570 people through 190 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Burnet County, Texas. EPA system ID: TX0270141; phone on file: 512-990-4400. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Rio Ancho Subdivision's lead record
That is up 2.41 ppb from 0 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Rio Ancho Subdivision is 2.41 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.41 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0.7 ppb |
| 2016 | 2 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. Rio Ancho Subdivision's 2.41 ppb sits at the 87th percentile in Texas and the 77th nationally (higher means more lead).
Nearby utilities
31 other systems share Burnet County; 10 of them have a higher latest lead result than Rio Ancho Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Marble Falls | 8,059 | 1.84 ppb |
| City Of Burnet | 7,011 | 1.93 ppb |
| City Of Granite Shoals | 6,795 | 1.43 ppb |
| City Of Bertram | 3,636 | 1.21 ppb |
| City Of Meadowlakes | 2,480 | 3.83 ppb |
| City Of Cottonwood Shores | 2,157 | 1.86 ppb |
| Spicewood Beach | 1,452 | 4.06 ppb |
| City Of Highland Haven Water System | 734 | 2.08 ppb |
| City Of Granite Shoals Sherwood Iii | 675 | 5.87 ppb |
| Ridge Harbor | 573 | 2.13 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Austin, 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 Rio Ancho Subdivision 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.