Water Quality: Douglas, AZ
5 water systems • 19,448 people served
Multiple Health ViolationsWater Quality Summary
Douglas is served by 5 public water systems with a combined service population of 19,448 people, and has 163 EPA Safe Drinking Water Act violations on record. Critically, 10 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Douglas's violation count is 57% below the national average for Arizona. Contaminants associated with violations include Chlorine Dioxide, E. coli, Gross Alpha, Stage 2 DBP.
Contaminants Found
Can cause anemia in infants and young children; may cause nervous system effects at high levels.
Common source: Water treatment disinfectant used to control taste, odor, and microorganisms
EPA limit: 0.8 mg/L
Causes gastrointestinal illness; certain strains (e.g., O157:H7) can cause severe kidney failure and death.
Common source: Fecal contamination from humans or animals entering the water supply
EPA limit: Zero (no E. coli permitted in drinking water)
Alpha-emitting radioactive particles increase cancer risk, particularly from bone and other internal cancers.
Common source: Natural uranium and radium in geological formations
EPA limit: 15 pCi/L (excluding radon and uranium)
Trihalomethanes and haloacetic acids that increase cancer risk and may cause adverse reproductive outcomes.
Common source: Chlorine disinfection reacting with natural organic matter in source water
EPA limit: TTHM: 0.080 mg/L; HAA5: 0.060 mg/L
Water Systems Serving Douglas
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| DOUGLAS CITY OF | AZ0402014 | Groundwater | 16,656 | 35 |
| BISBEE DOUGLAS INTL AIRPORT | AZ0402061 | Groundwater | 2,600 | 44 |
| COCHISE COLLEGE PARK WATER ASSOC | AZ0402040 | Groundwater | 83 | 20 |
| TWIN BUTTES RV, LLC | AZ0402360 | Groundwater | 79 | 24 |
| LA COSTA WATER USERS ASSOC | AZ0402041 | Groundwater | 30 | 40 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in Arizona
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.