Arsenic, chloride, and E. coli are present in Essex County groundwater. Contaminant levels here are low and do not exceed EPA health standards.
The sandy and clay layers of the Northern Atlantic Coastal Plain aquifer naturally contain arsenic and chloride. Saltwater from the nearby coast can seep into groundwater in coastal areas, raising chloride levels. E. coli enters from surface sources near wells or through cracks in well casings.
Groundwater in this county is soft with elevated sodium as the main mineral characteristic. Sodium concentrates here because of the saltwater influence from the coastal plain environment. Most wells in Essex County show this soft water pattern with high sodium.
No county-level data showing analytes exceeding EPA health standards was found for Essex County wells. However, arsenic, chloride, and E. coli are detected in groundwater here and warrant attention. Arsenic builds up in your body over time and can damage your kidneys and increase cancer risk. Chloride at elevated levels can harm people with heart disease or high blood pressure. E. coli is a bacteria that causes serious digestive illness and can be especially dangerous for young children, elderly people, and anyone with a weak immune system.
Essex County wells are soft, which means you won't see white scale buildup or have problems with appliance lifespan. The high sodium content is the main concern for water quality. High sodium can leave a salty taste in your drinking water and cooking, and it's a worry for people who need to limit salt in their diet for health reasons.
Every well in Essex County is different, and your well's water quality may be higher or lower than what's common in the county. We recommend testing your well to find out exactly what contaminants are present so you can treat them properly. A basic test for bacteria and nitrate costs around fifty to one hundred dollars, while a comprehensive panel for metals and minerals runs two hundred to four hundred dollars. Depending on your results, treatment options like boiling, chlorination, or carbon filtration may help.
| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Total Coliform | 1* | 0% | Low | Safe ⓘ | |
| Sodium | 8 | — | Low | Low ⓘ | |
| pH | 5 | — | Low | Low ⓘ | |
| Hardness | 9 | — | Low | 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.
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