Stone Mountain Subdivision, TX
Lead detected, under the action levels
Latest 90th-percentile lead: 3.46 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 Stone Mountain Subdivision
Stone Mountain Subdivision serves about 60 people through 20 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Burnet County, Texas. EPA system ID: TX0270134; phone on file: 512-990-4400. 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 (3.8 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Stone Mountain Subdivision is 4.9 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3.46 ppb |
| 2022 | 3.8 ppb |
| 2019 | 1 ppb |
| 2016 | 4.9 ppb |
How Stone Mountain Subdivision 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. Stone Mountain Subdivision's 3.46 ppb sits at the 93rd percentile in Texas and the 85th nationally (higher means more lead).
Other water systems in Burnet County
31 other systems share Burnet County; 6 of them have a higher latest lead result than Stone Mountain 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 Stone Mountain 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. 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.