Groundwater in Orange County contains manganese, iron, chloride, fluoride, nitrate, and sulfate. Several of these contaminants exceed EPA health standards, making them a concern for well owners in this area.
These contaminants come from the rock and soil layers beneath the county. The coastal lowlands here contain minerals and salts naturally present in the aquifer, and saltwater intrusion from the Gulf Coast pushes chloride deeper into the groundwater. Nitrate enters from land use like septic systems and fertilizer. Iron and manganese leach from the rock itself as water moves through the ground.
Groundwater in Orange County is soft but high in sodium and iron. The coastal environment and the rock composition here naturally concentrate these minerals. Iron appears at moderate levels in wells across the county, while elevated sodium is a common characteristic in this area's groundwater.
Wells in Orange County commonly have chloride, fluoride, iron, manganese, nitrate, and sulfate at levels above what EPA health standards allow. Chloride at high levels can raise blood pressure in some people. Fluoride in excess can cause dental fluorosis, a condition affecting tooth development in children. Nitrate is especially dangerous for infants and can interfere with how blood carries oxygen. Iron and manganese can cause nervous system problems with long-term exposure.
The high sodium in county wells and elevated iron create real quality-of-life issues. Iron stains clothes, fixtures, and anything it touches a rusty orange color. High sodium gives the water a salty taste that many people notice right away. You may also see a metallic or unpleasant odor from the water.
We recommend testing your well water with a comprehensive panel since multiple contaminants exceed health standards in this county. Every well is different, and yours could have higher or lower levels than what is common here. Testing is the only way to know exactly what is in your water so you can treat it properly. A comprehensive metals and minerals panel typically costs $200 to $400. Treatment options like ion exchange systems or reverse osmosis can address multiple concerns 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 ⓘ |
|---|---|---|---|---|---|
| Manganese | 68 | 50% | Moderate | High | |
| Iron | 154 | 36% | High | High | |
| Chloride | 1613 | 25% | High | High | |
| Nitrate | 63 | 14% | Moderate | Moderate | |
| Sulfate | 579 | 1% | High | Low | |
| Fluoride | 258 | 0% | High | Low | |
| Arsenic | 62 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 34 | 0% | Moderate | Safe | |
| Lead | 61 | 0% | Moderate | Low | |
| Nitrite | 6 | 0% | Low | Safe ⓘ | |
| PFHxS ⓘ municipal | 34 | 0% | Moderate | Safe | |
| PFNA ⓘ municipal | 34 | 0% | Moderate | Safe | |
| PFOA ⓘ municipal | 34 | 0% | Moderate | Safe | |
| PFOS ⓘ municipal | 34 | 0% | Moderate | Safe | |
| Radon | 6 | 0% | Low | Low ⓘ | |
| Uranium | 23 | 0% | Moderate | Low | |
| Hardness | 223 | — | High | Low | |
| PFBS ⓘ municipal | 34 | — | Moderate | Safe | |
| pH | 1340 | — | High | Low | |
| Sodium | 176 | — | High | 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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