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Detailed report on nitrates levels detected in Wilmington's public drinking water supply. Last updated 2026-02-03.
2.886 mg/L
Detected level is 28.9% of the EPA maximum contaminant level (10 mg/L)
Sample date: 2025-11-22
Overall Grade
Detected Level
2.886 mg/L
EPA Maximum (MCL)
10 mg/L
Percentage of Limit
28.9%
The detected level of nitrates in Wilmington's water is below 50% of the EPA's maximum contaminant level. While any detection warrants awareness, this level is considered safe by federal standards. EPA MCL: 10 mg/L for nitrate as nitrogen.
This data is based on water quality testing performed on 2025-11-22. Water quality can vary over time, and we recommend checking for the most recent data periodically.
Nitrates are particularly dangerous for infants under 6 months, causing "blue baby syndrome" (methemoglobinemia). In adults, high nitrate levels may be linked to certain cancers and thyroid conditions.
Residents of Wilmington should be aware that nitrates has been detected in the local water supply at 28.9% of the EPA limit. Current levels are within safe limits, but ongoing awareness is important.
Certain groups face higher risks from nitrates exposure:
Nitrates primarily come from agricultural fertilizer runoff, animal waste, septic systems, and natural decomposition. Agricultural areas tend to have higher nitrate levels.
Wilmington draws its drinking water from surface water sources (rivers, lakes, or reservoirs). The city is served by 1 water system, including WILMINGTON WATER SYSTEM.
Nitrates was detected in Wilmington's water at 2.886 mg/L, which is 28.9% of the EPA maximum. This is within federal safety limits. Consider a certified water filter for extra peace of mind, particularly if you have young children or are in a vulnerable health group.
The following filtration methods are proven effective at reducing or removing nitrates from drinking water:
Reverse Osmosis
Ion Exchange
Distillation
When choosing a filter, look for NSF/ANSI certification specific to nitrates removal. Not all filters are equally effective, and certification ensures the product has been independently tested.
See Filter Recommendations for WilmingtonBased on the most recent testing data, nitrates was detected in Wilmington, Delaware water at a level of 2.886 mg/L. This is 28.9% of the EPA maximum contaminant level of 10 mg/L. EPA MCL: 10 mg/L for nitrate as nitrogen.
Nitrates was detected in Wilmington's water at 28.9% of the EPA limit, which is considered safe by federal standards. Nitrates are particularly dangerous for infants under 6 months, causing "blue baby syndrome" (methemoglobinemia). In adults, high nitrate levels may be linked to certain cancers and thyroid conditions. While current levels are not considered dangerous, some health organizations suggest minimizing exposure whenever possible.
The most effective methods for removing nitrates from your drinking water are: Reverse Osmosis, Ion Exchange, Distillation. When purchasing a filter, look for NSF/ANSI certification that specifically covers nitrates 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, Wilmington's water utility is required by the EPA to regularly test for nitrates as part of the Safe Drinking Water Act. The most recent testing detected nitrates at 2.886 mg/L. 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.
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