Groundwater in Blanco County contains fluoride, iron, manganese, and sulfate that exceed EPA health standards. Iron and manganese are at moderate levels, but sulfate is very high and fluoride is also elevated above safe drinking water limits.
These contaminants come from the bedrock beneath the county. As rainwater seeps down through the ground, it dissolves minerals from the rock and picks up fluoride, iron, and manganese naturally. Sulfate concentrations are particularly high because of the specific composition of rocks in this area that contain sulfate minerals.
Groundwater in Blanco County is very hard, driven by elevated calcium and magnesium from the limestone and mineral-rich rock below. The county's aquifer naturally produces water that dissolves these hardness minerals as it filters through the ground. Very hard water with these mineral characteristics is widespread across wells throughout the county.
Fluoride, iron, manganese, and sulfate exceed EPA health standards in wells across Blanco County. Fluoride at elevated levels can affect bone health and tooth development. Iron and manganese can harm the nervous system, particularly in children and developing brains. Sulfate at very high concentrations can cause digestive issues, especially in infants and people with compromised immune systems.
The extremely hard water in this county creates serious quality-of-life problems. You will see rust stains on fixtures and laundry from iron deposits. White crusty scale builds up on faucets, shower heads, and inside pipes. Soap doesn't work as well, and water may taste slightly salty or have a sulfur odor. This extreme hardness shortens the lifespan of water heaters, dishwashers, and washing machines.
Because every well is different, your water may contain higher or lower levels than what is common here. Testing is the only way to know what is actually in your well so you can treat it properly. We recommend a comprehensive metals and minerals panel, which typically costs between $200 and $400. Treatment options like water softeners, iron removal systems, and sulfate filters can address these concerns.
Not sure if your well is affected? Get certified results in 5–7 days.
Test Your Well Water with Tap Score →| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Sulfate | 5 | 60% | Low | High ⓘ | |
| Iron | 448 | 16% | High | High | |
| Manganese | 414 | 2% | High | Low | |
| Fluoride | 741 | 1% | High | Low | |
| Arsenic | 407 | 0% | High | Low | |
| Chloride | 5 | 0% | Low | Low ⓘ | |
| Lead | 400 | 0% | High | Low | |
| Nitrate | 23 | 0% | Moderate | Low | |
| Nitrite | 5 | 0% | Low | Low ⓘ | |
| Radon | 4 | 0% | Low | Low ⓘ | |
| Uranium | 251 | 0% | High | Low | |
| Total Coliform | 1* | 0% | Low | Safe ⓘ | |
| Sodium | 4 | — | Low | Low ⓘ | |
| pH | 5 | — | Low | Low ⓘ | |
| Hardness | 4 | — | Low | Low ⓘ | |
| E. coli | 1* | 0% | Low | Safe ⓘ |
MCL = Maximum Contaminant Level (EPA limit for public water; used as benchmark for private wells). Distribution shows % of sampled wells in each concentration band. Methodology.
* Microbial contaminants (E. coli, coliform) reflect only samples from the last 10 years.
Data shows potential risk — a certified test confirms whether your water is affected.
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