DUNCAN, Nebraska Tap Water Quality

392 people served · 1 water system

Poor

DUNCAN, Nebraska is a rural community with 392 residents served by a single public water system. Water service covers ZIP code 68634.

DUNCAN has a notable pattern of EPA health-based violations across multiple compliance periods. Filtered water is a reasonable precaution while the utility implements long-term corrective action.

EPA reporting identifies Mercury (Inorganic) among the regulated contaminants associated with DUNCAN's recent health-based violations. Each contaminant has different sources, health implications, and recommended mitigation steps — links to the full EPA reference for each are listed alongside the violation history below.

Last updated: 2026-05-18 · Source: EPA SDWIS

Location

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Centered on ZIP-code centroids of water systems serving this city.

ZIP Codes Served

68634

Health-Based Violations (Last 5 Years)

EPA Maximum Contaminant Level exceedances reported by water systems serving DUNCAN. Each entry explains the contaminant, the health risk, and recommended precautions, and links to a full guide.

Mercury (Inorganic)chemical

EPA Code 1038 · Maximum Contaminant Level Exceedance

violations

EPA Limit

0.002 mg/L

Last Reading

12 MG/L

First Reported

Jul 2023

Most Recent

Jan 2024

What this violation means

Inorganic mercury in drinking water primarily damages kidneys. Most mercury exposure for Americans comes from fish (methylmercury), but localized water contamination occurs near refineries, coal-burning plants, and certain landfills.

Recommended precautions

→Reverse osmosis and distillation remove inorganic mercury.
→Activated carbon adsorption works for mercury but capacity is limited.
→Test private wells near industrial sites or landfills.

Read the complete guide to Mercury (Inorganic)

Source: EPA Safe Drinking Water Information System (SDWIS). Health-based violations only. Older violations may have been resolved; check your utility's most recent Consumer Confidence Report for current status.

Water Systems Serving DUNCAN

DUNCAN, VILLAGE OF

PWSID: NE3114113

392 served

8 violations

What Can You Do?

✅ Request your utility's annual Consumer Confidence Report (CCR) — required by law.
✅ Use an NSF-certified water filter if violations involve lead, arsenic, or PFAS.
✅ Run cold water for 30 seconds before drinking if you have older plumbing (reduces lead).
✅ Check back monthly — we update data from the EPA every 30 days.

About this data

This overview reflects EPA SDWIS data published as of 2026-05-18. It covers active Community Water Systems (CWS) that exceeded federal Maximum Contaminant Levels during the past five-year EPA reporting window. For up-to-the-minute information, request a current Consumer Confidence Report from your utility, or review the EPA's public dashboard.

Frequently Asked Questions

Is DUNCAN, Nebraska tap water safe to drink?▼

This city's water had significant EPA violations in the last 5 years.

How many EPA violations does DUNCAN have?▼

DUNCAN has 8 EPA health-based water violations in the last 5 years across 1 water system serving 392 people.

What contaminants have been found in DUNCAN water?▼

The following EPA-regulated contaminants have been detected: 1038. View details about each contaminant, health effects, and recommended precautions above in the violations table.

Should I use a water filter in DUNCAN?▼

Using an NSF-certified water filter is recommended if your area has violations involving lead, arsenic, or PFAS. For other contaminants, consult your local water utility. Check the annual Consumer Confidence Report (CCR) for detailed guidance.

What should I do if there are violations in DUNCAN?▼

Request your water utility's annual Consumer Confidence Report (CCR), which is required by the EPA. Follow the utility's guidance on boil water advisories. Run cold water for 30 seconds before drinking if you have older plumbing. Use an NSF-certified filter if needed based on your water system's violations.