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Detailed report on nitrates levels detected in Douglas's public drinking water supply. Last updated 2026-02-03.
1.7529 mg/L
Detected level is 17.5% of the EPA maximum contaminant level (10 mg/L)
Sample date: 2025-11-27
Overall Grade
Detected Level
1.7529 mg/L
EPA Maximum (MCL)
10 mg/L
Percentage of Limit
17.5%
The detected level of nitrates in Douglas'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 2025-11-27. Water quality can vary over time, and we recommend checking for the most recent data periodically.
Douglas has 1 recorded violation related to nitrates.
monitoring violation
Status: Resolved
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 Douglas should be aware that nitrates has been detected in the local water supply at 17.5% 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.
Douglas draws its drinking water from surface water sources (rivers, lakes, or reservoirs). The city is served by 1 water system, including DOUGLAS WATER SYSTEM.
Nitrates was detected in Douglas's water at 1.7529 mg/L, which is 17.5% 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 DouglasBased on the most recent testing data, nitrates was detected in Douglas, Arizona water at a level of 1.7529 mg/L. This is 17.5% of the EPA maximum contaminant level of 10 mg/L. EPA MCL: 10 mg/L for nitrate as nitrogen.
Nitrates was detected in Douglas's water at 17.5% 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, Douglas'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 1.7529 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.
Full Water Quality Report
Douglas, Arizona — All contaminants, scores, and violations
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