Orange County groundwater contains radon, manganese, iron, arsenic, chloride, fluoride, lead, nitrate, and uranium. Multiple contaminants exceed EPA health standards, making this water a concern for well owners and worth testing.
These contaminants come from the rocks beneath the county and from human activities on the land above. The underlying rock contains naturally occurring metals like manganese, iron, arsenic, and uranium that dissolve into groundwater over time. Radon seeps up from radioactive minerals in the rock. Nitrate and chloride often enter from septic systems, road salt, and fertilizer use on farms and lawns.
Groundwater in this county is hard, driven by calcium and magnesium dissolved from the rocks below. Hard water comes from water moving slowly through limestone and other minerals underground in this region. Hardness is a widespread trait across wells in Orange County, though individual well results can vary.
Wells in Orange County commonly contain arsenic, chloride, fluoride, lead, uranium, and radon at levels above EPA health standards. Arsenic and uranium are linked to cancer risk with long-term exposure. Lead damages children's brains and development. Radon increases lung cancer risk. Nitrate and manganese in county wells can harm infants and affect the nervous system over time.
The hard water in this county's wells can leave white scale buildup on faucets and fixtures and shorten the lifespan of water heaters and dishwashers. Hard water also makes soap work less well and can leave spots on dishes and glass. Some people notice a chalky taste with hard water, though the minerals themselves are not a health concern.
We recommend testing your well water with a comprehensive panel since several contaminants exceed health standards in county wells. Your well is unique and could have much higher or lower levels than what is common here. A comprehensive test runs $200 to $400 and is the only way to know what is actually in your water so you can treat it correctly. Depending on results, treatment options range from simple filters to whole-house systems that handle multiple contaminants.
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 ⓘ |
|---|---|---|---|---|---|
| Radon | 52 | 98% | Moderate | High ⓘ | |
| Manganese | 713 | 13% | High | Moderate | |
| Iron | 563 | 10% | High | Moderate | |
| Lead | 2071 | 6% | High | Moderate | |
| Arsenic | 1220 | 3% | High | Low | |
| Chloride | 1047 | 1% | High | Low | |
| Nitrate | 1113 | 0% | High | Low | |
| Fluoride | 1293 | 0% | High | Low | |
| Uranium | 1111 | 0% | High | Low | |
| Nitrite | 1095 | 0% | High | Low | |
| Sulfate | 10 | 0% | Low | Low | |
| Total Coliform | 1* | 0% | Low | Safe ⓘ | |
| Sodium | 550 | — | High | Low | |
| pH | 192 | — | High | Low | |
| Hardness | 377 | — | High | Low | |
| E. coli | 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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