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Detailed report on arsenic levels detected in New Castle's public drinking water supply. Last updated 2026-02-03.
Good news — Arsenic was not detected at concerning levels in New Castle's water supply
Based on the most recent water quality testing data, arsenic was either not detected or found at levels well below EPA safety thresholds in New Castle's drinking water.
Arsenic was not detected at reportable levels in New Castle's most recent water quality testing. This is a positive indicator for the safety of the local water supply regarding this specific contaminant.
EPA MCL: 0.010 mg/L (10 ppb).
Even when a contaminant is not detected in routine testing, conditions can change. Aging infrastructure, seasonal variations, and changes in water source can all affect contaminant levels. Periodic home water testing provides an additional layer of assurance.
Long-term arsenic exposure is linked to skin damage, circulatory problems, and increased cancer risk (skin, bladder, lung). Even low levels over time can be harmful.
Residents of New Castle should be aware that while arsenic was not detected at concerning levels, understanding the risks is still valuable. Water quality conditions can change, and awareness helps you respond quickly if they do.
Certain groups face higher risks from arsenic exposure:
Arsenic occurs naturally in certain rock formations and can leach into groundwater. It can also come from industrial runoff, mining operations, and agricultural chemicals.
New Castle draws its drinking water from surface water sources (rivers, lakes, or reservoirs). The city is served by 1 water system, including NEW CASTLE WATER SYSTEM.
Since arsenic was not detected at concerning levels in New Castle's water, no immediate action is required. However, periodic home water testing is always wise, especially if you have older plumbing or are in a sensitive health category. Water quality can change over time due to infrastructure aging, source water changes, or seasonal fluctuations.
The following filtration methods are proven effective at reducing or removing arsenic from drinking water:
Reverse Osmosis
Specialty Adsorption Media
Distillation
When choosing a filter, look for NSF/ANSI certification specific to arsenic removal. Not all filters are equally effective, and certification ensures the product has been independently tested.
See Filter Recommendations for New CastleBased on the most recent available testing data, arsenic was not detected at concerning levels in New Castle, Delaware drinking water. This means either it was not present or it was found at levels below the reporting threshold. EPA MCL: 0.010 mg/L (10 ppb).
Arsenic was not detected at concerning levels in New Castle's water, so there is no current danger from this contaminant. However, it is important to understand the potential risks: Long-term arsenic exposure is linked to skin damage, circulatory problems, and increased cancer risk (skin, bladder, lung). Even low levels over time can be harmful. Regular testing helps ensure continued safety.
The most effective methods for removing arsenic from your drinking water are: Reverse Osmosis, Specialty Adsorption Media, Distillation. When purchasing a filter, look for NSF/ANSI certification that specifically covers arsenic removal. Installation of a point-of-use filter (at your kitchen faucet or as an under-sink system) provides targeted protection for drinking and cooking water. For whole-house protection, a point-of-entry system can treat all water entering your home.
Yes, New Castle's water utility is required by the EPA to regularly test for arsenic as part of the Safe Drinking Water Act. The most recent testing did not find arsenic at concerning levels. These results are published in the city's annual Consumer Confidence Report (CCR), also known as a Water Quality Report. You can also request additional testing information directly from your local water utility or have your home's water independently tested for a more specific assessment.
Full Water Quality Report
New Castle, Delaware — All contaminants, scores, and violations
Filter Recommendations
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Is New Castle Water Safe to Drink?
Complete safety assessment for New Castle tap water