Water Quality: Sierra Vista, AZ
12 water systems • 56,567 people served
Multiple Health ViolationsWater Quality Summary
Sierra Vista is served by 12 public water systems with a combined service population of 56,567 people, and has 1,278 EPA Safe Drinking Water Act violations on record. Critically, 16 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Sierra Vista's violation count is 236% above the national average for Arizona. Contaminants associated with violations include Chlorine Dioxide, 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 Sierra Vista
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| BELLA VISTA CITY WATER SYSTEM | AZ0402010 | Groundwater | 20,045 | 12 |
| LIBERTY WATER RIO RICO | AZ0412011 | Groundwater | 17,960 | 24 |
| PUEBLO DEL SOL WATER COMPANY | AZ0402044 | Groundwater | 12,804 | 1001 |
| BELLA VISTA WATER SOUTH | AZ0402007 | Groundwater | 2,178 | 30 |
| SOUTHERN SUNRISE WC COCHISE HORSESHOE | AZ0402011 | Groundwater | 1,588 | 12 |
| SOUTHERN SUNRISE WC MIRACLE VALLEY | AZ0402023 | Groundwater | 620 | 15 |
| NORTHERN SUNRISE WC CORONADO | AZ0402013 | Groundwater | 553 | 13 |
| SIERRA VISTA MH VILLAGE | AZ0402101 | Groundwater | 328 | 11 |
| NORTHERN SUNRISE WC MUSTANG CRYSTAL | AZ0402054 | Groundwater | 315 | 12 |
| NACO ESTATES | AZ0402345 | Groundwater | 75 | 29 |
| SULGER WATER COMPANY 2 | AZ0402120 | Groundwater | 67 | 81 |
| DESERT WINDS MOBILE PARK | AZ0402353 | Groundwater | 34 | 38 |
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.