Groundwater in Martin County contains iron, PFOS, chloride, and sulfate at levels that exceed EPA health standards. These contaminant levels are high enough that well owners should take them seriously and consider testing their water.
Iron comes from the rock layers beneath Martin County--these sediments naturally release iron as water passes through them. Chloride and sulfate also occur naturally in coastal plain rock, though saltwater intrusion from the ocean can push chloride levels higher near the coast. PFOS is a human-made chemical that enters groundwater from industrial sites, firefighting foam, and certain manufacturing facilities in the region.
Groundwater in this county is high in iron, which is the main mineral character you will notice. Iron concentrates here because the underground sand and clay layers that supply wells naturally contain iron-bearing minerals that dissolve as water flows through them. Most wells in Martin County show elevated iron.
Wells in Martin County have been found to contain chloride, iron, PFOS, and sulfate at levels exceeding EPA health standards. Chloride at high levels can be a concern for people with heart disease or high blood pressure. Iron itself is not toxic, but PFOS is a chemical that can build up in your body over time and may affect your immune system and liver. Sulfate can cause digestive problems, especially in infants and people with certain health conditions.
The high iron in county wells creates visible staining on sinks, toilets, and laundry. Your water may taste metallic or look rusty or cloudy. Iron can clog pipes and reduce water pressure over time. These problems affect daily life even though iron is not a direct health hazard.
We recommend testing your well water with a comprehensive panel to find out exactly what is in your water, since every well is different and yours could have higher or lower levels than what is common in the county. Testing is the only way to know what needs treatment. A comprehensive metals and minerals panel typically costs between $200 and $400. Iron removal systems and water softeners can help address the mineral concerns found in this area.
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 ⓘ |
|---|---|---|---|---|---|
| Iron | 440 | 46% | High | High | |
| PFOS ⓘ municipal | 12 | 25% | Low | High | |
| Manganese | 46 | 4% | Moderate |
Moderate
Elevated concentration, not % above limit
|
|
| Fluoride | 71 | 4% | Moderate |
Moderate
Elevated concentration, not % above limit
|
|
| Chloride | 450 | 2% | High | Low | |
| Sulfate | 393 | 1% | High | Low | |
| Arsenic | 3 | 0% | Low | Low ⓘ | |
| HFPO-DA (GenX) ⓘ municipal | 12 | 0% | Low | Safe | |
| Lead | 3 | 0% | Low | Safe ⓘ | |
| Nitrate | 45 | 0% | Moderate | Low | |
| Nitrite | 4 | 0% | Low | Low ⓘ | |
| PFHxS ⓘ municipal | 12 | 0% | Low | Safe | |
| PFNA ⓘ municipal | 12 | 0% | Low | Safe | |
| PFOA ⓘ municipal | 12 | 0% | Low | Safe | |
| Radon | 2 | 0% | Low | Low ⓘ | |
| Uranium | 3 | 0% | Low | Safe ⓘ | |
| E. coli | 1* | 0% | Low | Safe ⓘ | |
| Hardness | 450 | — | High | Low | |
| PFBS ⓘ municipal | 12 | — | Low | Safe | |
| pH | 385 | — | High | Low | |
| Sodium | 42 | — | Moderate | Low | |
| Total Coliform | 1* | 0% | 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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