Chloride, E. coli, and fecal coliform are present in Roanoke's groundwater. These contaminants are detected at levels below EPA health standards, so they are not a major health concern across the city.
Chloride enters groundwater from road salt, septic systems, and urban runoff in this built-up area. E. coli and fecal coliform come from sewage leaks, aging pipes, and septic system failures in the city. The carbonate limestone rock underneath does not naturally filter out bacteria the way some rock types do, so these microbes can reach wells more easily.
Groundwater in Roanoke is very hard, with elevated calcium and magnesium from the limestone bedrock below. As water flows through the carbonate rock, it dissolves these minerals and carries them into wells. Iron and sulfate are also present at moderate levels from the rock. Very hard water is common across Roanoke's wells.
Roanoke city wells do not show analytes exceeding EPA health standards based on county data. However, bacteria like e. coli and fecal coliform have been detected in some wells in this area. These bacteria come from sewage or animal waste and can cause serious stomach illness, especially in young children, elderly people, and those with weak immune systems.
Wells in Roanoke city typically have very hard water, which leaves white scale buildup on faucets, showerheads, and inside pipes. This scale can shorten the lifespan of water heaters and dishwashers. Hard water also makes it harder for soap to work well and can leave spots on dishes and glassware. You may notice a slight metallic or iron taste in the water or staining on bathroom fixtures.
We recommend testing your well water to find out what is actually in it, since every well is different and yours could have higher or lower contamination than others nearby. Testing is the only way to know if bacteria or other contaminants are present so you can treat them properly. A basic screening for bacteria and nitrate runs fifty to one hundred dollars. Chlorination or filtration systems can address bacterial concerns depending on what testing shows.
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 ⓘ |
|---|---|---|---|---|---|
| Chloride | 4 | 0% | Low | Low ⓘ | |
| Fluoride | 1 | 0% | Low | Low ⓘ | |
| Iron | 3 | 0% | Low | Low ⓘ | |
| Lead | 2 | 0% | Low | Safe ⓘ | |
| Nitrate | 4 | 0% | Low | Low ⓘ | |
| Nitrite | 3 | 0% | Low | Low ⓘ | |
| Sulfate | 2 | 0% | Low | Low ⓘ | |
| Hardness | 2 | — | Low | Low ⓘ | |
| pH | 3 | — | Low | Low ⓘ | |
| Sodium | 2 | — | Low | Low ⓘ |
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.
Order a Tap Score Test →Population-level CDC data. Not individual risk prediction.
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