C
68

Fair Water Quality

Willcox, AZ 85643

Cochise County · Population served: 3,236 · Data updated March 2026

Water Systems Serving This Area

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CITY OF WILLCOX
Groundwater · Pop. 3,236
PWSID: AZ0402035

Contaminants Detected

ContaminantDetected LevelEPA MCLHealth GuidelineStatus
Lead
0.8
15 ppb 1 ppb Passed

Violation History (Last 5 Years)

54Total (5yr)
0Health-Based
37Major

Water Quality Summary

Understanding Your Water in Willcox

Tap water quality in Willcox, Arizona (85643) receives an overall grade of C (Fair) with a score of 68 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 8 points above the Arizona state average of 60. The area is served by City Of Willcox, a groundwater system providing water to approximately 3,236 people. The area has 54 violations over the past 5 years, though none were classified as health-based.

Your Score 68/100 C
vs State 8 pts above Arizona avg (60)
vs National 7 pts below national avg (75)

What a Grade C Means

A score of 68/100 indicates fair water quality in Willcox, AZ. While the water meets minimum federal standards, there are noteworthy concerns — either elevated contaminant levels approaching regulatory limits, a moderate violation history, or both. Residents may want to review specific contaminant data and consider targeted filtration, especially for sensitive groups like children and pregnant women.

Groundwater: drawn from underground aquifers via wells

Health Information

What These Contaminants Mean for You

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Lead in Your Water

Lead is a toxic metal that can leach from aging pipes and plumbing fixtures.

Health Effects

Even low levels of lead exposure can cause developmental delays in children, kidney damage, and cardiovascular effects in adults. The EPA action level is 15 ppb, but health experts recommend no safe level of lead in drinking water.

Common Sources

Lead enters water primarily through corrosion of lead service lines, lead solder, and brass fixtures — especially in homes built before 1986.

What You Can Do

If lead is detected above 1 ppb, consider using a certified lead-removal filter (NSF/ANSI 53) for drinking and cooking water. Run cold water for 30 seconds before use if water has been sitting in pipes.

Common Questions

Frequently Asked Questions

Tap water in Willcox, Arizona receives a grade of C (Fair) with a score of 68/100. While it generally meets minimum federal standards, there are some areas of concern including violation history or elevated contaminant levels. Sensitive populations (children, pregnant women, elderly) may want to consider additional filtration.

ZIP code 85643 is served by 1 water system using groundwater sources, providing water to approximately 3,236 people. Groundwater is naturally filtered through rock and soil, often requiring less treatment. However, it can be vulnerable to contamination from underground sources like naturally occurring arsenic, nitrates from agriculture, or PFAS from industrial sites.

Lead levels in Willcox, Arizona are 0.8 ppb, which is at or below the health guideline of 1 ppb. This is a positive result, though periodic testing is still recommended.

No PFAS ("forever chemicals") were detected in water systems serving Willcox, Arizona during the most recent EPA monitoring period (UCMR5). However, not all water systems have been tested for all PFAS compounds, and new contamination can occur over time.

Water systems serving Willcox, Arizona have received 54 violations in the last 5 years. Violations can range from paperwork issues (monitoring & reporting) to serious health-based violations where contaminant levels exceeded safe limits. Review the violation details above for specifics.

Water in Willcox, Arizona shows no major contaminant concerns based on available data. A basic carbon filter can improve taste and reduce chlorine. For extra peace of mind, an NSF-certified pitcher filter or faucet-mount filter provides an affordable layer of protection.

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