Groundwater in Blanco County contains fluoride, iron, manganese, and sulfate at levels that exceed EPA health standards. These contaminants are present at concerning concentrations that well owners should monitor and address.
The rock layers beneath Blanco County naturally release these minerals and salts into the groundwater. Iron and manganese dissolve from the rock matrix where water sits underground without oxygen, while sulfate concentrations build up from the slow dissolution of minerals in the deep rock layers. This natural mineral release is common across the region's varied rock types.
Groundwater in this county is very hard, with extremely elevated sulfate alongside moderate iron and high mineral content from the underlying rocks. These minerals accumulate because water moves slowly through the rock layers, spending years in contact with the stone and dissolving minerals along the way. Most wells in Blanco County show these hard water and high sulfate characteristics to some degree.
Wells in Blanco County contain fluoride, iron, manganese, and sulfate at levels above EPA health standards. Fluoride at high levels can damage tooth enamel, especially in children whose teeth are still developing. Iron and manganese can affect the brain and nervous system, particularly in infants and young children. Sulfate can cause digestive problems and diarrhea in some people, especially infants and visitors new to the area.
The water in this county is extremely hard, which means scale builds up inside pipes and on fixtures like faucets and showerheads. You will probably see rust or brown staining from iron in sinks, toilets, and laundry. The high sulfate content gives water a bitter taste and sometimes a rotten egg smell. Hard water shortens the life of water heaters, dishwashers, and washing machines because mineral deposits clog and damage them over time.
We recommend testing your well because every well in the county is different, and your water could have higher or lower levels than what is common here. A comprehensive panel testing for metals and minerals costs between two hundred and four hundred dollars and is the only way to know what is actually in your well so you can treat it properly. Treatment options like reverse osmosis systems or ion exchange softeners can address multiple problems at once.
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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