Duncan Town of
EPA ID: AZ0406001 · 605 people served · 1 ZIP code
The EPA enforcement database lists 10 active violations for Duncan Town of — a provider that delivers drinking water to approximately 605 people and has not yet formally resolved those findings.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 1 (2023) to 1 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Duncan Town of Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The Duncan Town of serves a community with a median household income of $63,929 and an estimated 3,088 residents across its service area. Approximately 62% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 67% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
Duncan Town of's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 0% of homes in Greenlee County, Arizona rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How Duncan Town of compares to EPA limits
What This Means For You
Atrazine at 6 mg/L exceeds the EPA maximum of 0.003 mg/L. Endocrine disruption, cardiovascular & reproductive effects. Consider granular activated carbon (GAC) filtration.
Consumer Confidence Report Rule at 12 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 7 mg/L exceeds the EPA maximum of mg/L.
Lead and Copper Rule at 5 mg/L exceeds the EPA maximum of mg/L.
Revised Total Coliform Rule at 4 presence exceeds the EPA maximum of presence.
Atrazine was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Duncan Town of (EPA ID: AZ0406001) is a community water system in Arizona that serves approximately 605 people from groundwater sources.
This system serves ZIP code 85534 in Duncan.
Average Home Safety Score: B (74/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| September 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| August 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| July 2, 2025 | Lead and Copper Rule | Monitoring | Unresolved |
| July 1, 2025 | Atrazine | Monitoring | Unresolved |
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Unresolved |
| April 1, 2025 | Atrazine | Monitoring | Resolved |
| January 2, 2025 | Lead and Copper Rule | Monitoring | Unresolved |
| January 1, 2025 | Atrazine | Health-based | Resolved |
| January 1, 2025 | Contaminant 1919 | Monitoring | Unresolved |
| October 1, 2024 | Atrazine | Health-based | Resolved |
| October 1, 2024 | Atrazine | Monitoring | Resolved |
| August 1, 2024 | Revised Total Coliform Rule | Monitoring | Resolved |
| August 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| July 1, 2024 | Total Organic Carbon | Monitoring | Unresolved |
| April 1, 2024 | Revised Total Coliform Rule | Monitoring | Resolved |
| April 1, 2024 | Atrazine | Monitoring | Unresolved |
| April 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| February 11, 2024 | Contaminant 0700 | Health-based | Resolved |
| January 1, 2024 | Contaminant 1996 | Monitoring | Resolved |
| December 1, 2023 | Consumer Confidence Report Rule | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting Failure | 12 | No |
| Surface Water Treatment Rule | Treatment Failure | 7 | No |
| Atrazine | Organic | 6 | Yes |
| Lead and Copper Rule | Treatment Failure | 5 | No |
| Revised Total Coliform Rule | Microbiological | 4 | No |
| Stage 1 DBP Rule | Treatment Failure | 2 | No |
| Contaminant 0700 | Other Violation | 2 | Yes |
| Contaminant 1919 | Other Violation | 1 | No |
| Contaminant 1925 | Other Violation | 1 | No |
| Contaminant 1996 | Other Violation | 1 | No |
| Total Organic Carbon | Disinfection Byproducts | 1 | No |
Health Risk Details
Atrazine (EPA limit: 0.003 mg/L)
Endocrine disruption, cardiovascular & reproductive effects At-risk groups: pregnant women, people in agricultural areas, rural communities in the Midwest corn belt.
Removal methods: granular activated carbon (GAC), carbon block filter, reverse osmosis. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 85534 | 0.0035 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
- 85534 — Duncan
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Duncan Town of (AZ0406001) on EPA.gov.
Frequently Asked Questions
Is Duncan Town of water safe to drink?
Duncan Town of has recorded 4 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Duncan Town of serve?
Duncan Town of serves approximately 605 people across 1 ZIP code in Arizona.
Where does Duncan Town of get its water?
The primary water source is groundwater.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Duncan Town of (EPA ID: AZ0406001) — request the latest Consumer Confidence Report or ask about specific contaminants.