Water Quality: Nogales, AZ
4 water systems • 22,692 people served
Multiple Health ViolationsWater Quality Summary
Nogales is served by 4 public water systems with a combined service population of 22,692 people, and has 896 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. Nogales's violation count is 136% above the national average for Arizona. Contaminants associated with violations include Chlorine Dioxide, Contaminant 1094, E. coli, 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)
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 Nogales
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| NOGALES CITY OF | AZ0412004 | Groundwater | 22,000 | 661 |
| TOWN & COUNTRY - PRESTON | AZ0412311 | Groundwater | 430 | 88 |
| THE GRAND ACRES | AZ0412305 | Groundwater | 153 | 45 |
| KINO RANCH 2 | AZ0412015 | Groundwater | 109 | 102 |
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.