Duncan Water Quality
Arizona
According to EPA SDWIS, Duncan, Arizona is served by 3 community water systems covering about 872 people. The same extract lists 10 health-based violation records, most recently coded 2039 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Duncan, Arizona is delivered through 3 EPA-regulated community water systems serving an estimated 872 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 10 violation records across the 3 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 2 distinct EPA contaminant codes: Di(2-ethylhexyl) phthalate, Groundwater Rule.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Arizona drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| DUNCAN TOWN OF | 605 | 8 | Health |
| VALLEY VIEW MHC & RV PARK | 142 | 2 | Health |
| HUNTER WATER - TOWN OF DUNCAN | 125 | 0 | Clean |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| DUNCAN TOWN OF | Di(2-ethylhexyl) phthalate | 2025-01-01 |
| DUNCAN TOWN OF | Di(2-ethylhexyl) phthalate | 2025-01-01 |
| DUNCAN TOWN OF | Di(2-ethylhexyl) phthalate | 2025-01-01 |
| DUNCAN TOWN OF | Di(2-ethylhexyl) phthalate | 2024-10-01 |
| DUNCAN TOWN OF | Di(2-ethylhexyl) phthalate | 2024-10-01 |
| DUNCAN TOWN OF | Di(2-ethylhexyl) phthalate | 2024-10-01 |
| DUNCAN TOWN OF | Groundwater Rule | 2024-02-11 |
| DUNCAN TOWN OF | Groundwater Rule | 2024-02-11 |
| VALLEY VIEW MHC & RV PARK | Groundwater Rule | 2023-10-30 |
| VALLEY VIEW MHC & RV PARK | Groundwater Rule | 2023-10-30 |
What are Duncan's health-based records for?
Duncan's health-based violation records carry 2 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Di(2-ethylhexyl) phthalate | 6 | 1 |
| Groundwater Rule | 4 | 2 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Duncan, Arizona? ▼
How many water violations does Duncan have in this EPA extract? ▼
What contaminants were found in Duncan water? ▼
How many water systems serve Duncan? ▼
Where does Duncan get its drinking water? ▼
How does Duncan compare in Arizona?
Of the 191 Arizona places with at least one community water system on file, Duncan ranks #55 by number of systems (3).
Either side of it: Cave Creek (3), Clarkdale (3), Eloy (3), Fredonia (3)
About This Data
Figures here are the current EPA SDWIS extract joined to the 3 community water systems whose service area lists Duncan, ranked against the 191 Arizona places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.