Sierra Vista, AZ: 24 Health Violations — 76/100 (2026)
4 ZIP codes · 9 water systems · Updated 2026-06-03
Tap water monitoring data for Sierra Vista shows a consistently clean picture in AZ — few violations on record, compliance well above the median.
How Sierra Vista Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Sierra Vista Water
- Your city's water systems recorded 148 violations in the past 5 years.
- Average lead level: 0.001 mg/L.
- Estimated remediation: $2,150 per household.
- CDC health risk index: 13.63 — above typical levels.
Who Supplies Your Water in Sierra Vista
Sierra Vista, AZ draws its residential water from 3 separate providers among the 9 federally tracked systems. Each operates independently, with its own infrastructure, rate structure, and compliance record.
Overview
We track water quality and home safety data for 4 ZIP codes in Sierra Vista, Arizona (population ~49,112), covering 9 community water systems serving approximately 89,072 people region-wide.
4 of 4 ZIP codes (100%) have recorded EPA violations. 24 health-based violations documented.
Home Safety Score
Average Home Safety Score for Sierra Vista: B (76/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Sierra Vista water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0010 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 4 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Total Coliform | Microbiological | 40 | 4 |
| Stage 1 DBP Rule | Treatment Technique | 25 | 4 |
| Stage 2 DBP Rule | Treatment Technique | 20 | 4 |
| Consumer Confidence Report Rule | Reporting | 20 | 4 |
| Revised Total Coliform Rule | Microbiological | 20 | 4 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 85635 | B | 37 | 6 | Bella Vista City Water System |
| 85636 | B | 37 | 6 | Bella Vista City Water System |
| 85650 | B | 37 | 6 | Bella Vista City Water System |
| 85671 | B | 37 | 6 | Bella Vista City Water System |
All ZIP Codes in Sierra Vista
- 85635 [B] — 37 violations ⚠
- 85636 [B] — 37 violations ⚠
- 85650 [B] — 37 violations ⚠
- 85671 [B] — 37 violations ⚠
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Health Outcomes in Sierra Vista
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Top Contaminants in Sierra Vista Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Cost Context: What Remediation Means for Sierra Vista Homeowners
How much of a Sierra Vista home's value does documented remediation represent? A small fraction — the equity share here is in the low tier, and from a household financial perspective, most property owners are considering a commitment that fits comfortably within standard planning rather than a decision that rises to the level of a material budget event or significant equity consideration.
Remediation costs in Sierra Vista are relatively low compared to home values. The $1,050–$4,050 estimated range is a small fraction of median property value. Home values are 0% above the Arizona average.
Lead Exposure Risk for Children in Sierra Vista
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Lead risk in Sierra Vista appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Sierra Vista
Flood exposure in Sierra Vista is meaningful by NFIP measures — 17 claims on record and 75% of ZIP codes carrying FEMA flood zone designations. That level of activity makes flood history a relevant factor when evaluating local water quality over time.
Sierra Vista has a moderate flood history with 17 FEMA claims averaging $2,938 per payout. 75% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,150</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Sierra Vista, AZ