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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Comprehensive water safety analysis • Updated April 2026
Sierra Vista maintains excellent water quality with all 10 tested contaminants well below EPA safety limits.
•All 1 historical violation(s) in Sierra Vista have been resolved.
Generally Safe. Sierra Vista's tap water meets EPA standards. Score: 93/100.
Want to understand your score better? Learn how scores are calculated →
10 contaminants tested • EPA SDWIS data • Click any contaminant for details
| Contaminant | Level Detected | EPA Limit | % of Limit | Status |
|---|---|---|---|---|
| Total Trihalomethanes | 17.86 ug/L | 80.00 ug/L | 22.3% | Safe |
| Haloacetic Acids | 11.00 ug/L | 60.00 ug/L | 18.3% | Safe |
| Copper | 0.228 mg/L | 1.30 mg/L | 17.6% | Safe |
| Mercury | 0.0003 mg/L | 0.0020 mg/L | 13.5% | Safe |
| Fluoride | 0.542 mg/L | 4.00 mg/L | 13.5% | Safe |
| Arsenic | 0.0013 mg/L | 0.010 mg/L | 12.8% | Safe |
| Nitrite | 0.125 mg/L | 1.00 mg/L | 12.5% | Safe |
| Nitrate | 0.904 mg/L | 10.00 mg/L | 9.0% | Safe |
| Lead | 0.0011 mg/L | 0.015 mg/L | 7.4% | Safe |
| Chromium | 0.0028 mg/L | 0.100 mg/L | 2.8% | Safe |
In-depth assessment of your municipal water supply
The water quality in Sierra Vista, Arizona has been comprehensively evaluated using data from the EPA's Safe Drinking Water Information System (SDWIS) and local water utility reports. Our analysis examines 10 distinct contaminants across multiple categories including inorganic chemicals, disinfection byproducts, microorganisms, and radionuclides. With an overall quality score of 93 out of 100 (Grade: A), Sierra Vista's water supply demonstrates strong compliance with federal drinking water standards.
Sierra Vista's primary water system, SIERRA VISTA WATER SYSTEM, serves approximately 41,468 residents. The water is sourced from a combination of surface and groundwater sources. Groundwater is generally naturally filtered through soil and rock layers, though it may contain elevated levels of minerals and naturally occurring contaminants like arsenic or radon.
Of the 10 contaminants analyzed in Sierra Vista's water supply, 10 (100%) are present at safe levels below 50% of EPA Maximum Contaminant Levels (MCLs). No contaminants currently exceed EPA safety limits. The most common categories of concern in municipal water supplies include disinfection byproducts formed during the chlorination process, heavy metals like lead that can leach from aging infrastructure, and naturally occurring contaminants like arsenic or radium that vary by geographic region.
Sierra Vista's water system has a compliance history with 1 documented EPA violation. All historical violations have been addressed and resolved. Violations can range from monitoring and reporting failures to actual exceedances of contaminant limits. Water utilities are required by law to notify customers of any violations that may affect health and to take corrective action to return to compliance.
Water quality at the tap can differ from quality at the treatment plant due to distribution system conditions. Homes built before 1986 may have lead service lines or lead solder in plumbing that can contribute to lead exposure. Older galvanized pipes can harbor bacteria and release metals. Running cold water for 30 seconds to 2 minutes before drinking or cooking helps flush stagnant water from pipes. Residents in older homes should consider testing their water directly at the tap to assess any additional contamination from household plumbing, as EPA monitoring typically occurs at distribution points rather than individual residences.
Understanding potential health effects for residents
Certain groups face elevated health risks from water contaminants and should take extra precautions. Pregnant women are particularly vulnerable as contaminants like lead and nitrates can affect fetal development, potentially causing developmental delays and birth defects. Infants and young children are at heightened risk because their developing bodies absorb contaminants more readily and are more susceptible to their effects; lead exposure in children can cause irreversible cognitive impairment and behavioral problems. Elderly individuals and those with compromised immune systems (including cancer patients, organ transplant recipients, and HIV/AIDS patients) are more susceptible to waterborne pathogens and may experience severe illness from microorganisms that healthy adults can tolerate. Individuals with kidney disease should be aware of fluoride and other mineral levels, as impaired kidney function affects the body's ability to filter these substances.
Lead has been detected in Sierra Vista's water supply. There is no safe level of lead exposure. In children, lead can cause developmental delays, learning difficulties, irritability, weight loss, hearing loss, and seizures. In adults, lead exposure contributes to cardiovascular problems, decreased kidney function, and reproductive issues. Pregnant women exposed to lead can transfer it to their developing fetus, increasing risk of premature birth and reduced growth. Use an NSF 53 certified filter and run cold water before drinking to reduce exposure.
Arsenic has been detected in Sierra Vista's water supply. Long-term arsenic exposure, even at levels near EPA limits, is associated with increased risk of skin, lung, bladder, kidney, and liver cancers. Arsenic exposure can also cause cardiovascular disease, diabetes, and neurological effects. Skin changes like thickening and pigmentation may indicate chronic exposure. Reverse osmosis filtration is highly effective at removing arsenic from drinking water.
Elevated nitrate levels in Sierra Vista's water pose particular risk to infants under six months. Nitrates can cause methemoglobinemia ("blue baby syndrome"), a condition where the blood cannot carry sufficient oxygen. Symptoms include bluish skin color, shortness of breath, and in severe cases, death. Formula-fed infants are at greatest risk. Pregnant women should also limit nitrate exposure. Boiling water does NOT remove nitrates—it actually concentrates them. Reverse osmosis or distillation systems effectively remove nitrates.
Based on Sierra Vista's water quality profile, residents should consider the following protective measures: While water quality is generally good, filtration remains beneficial for removing trace contaminants. Always use cold water for drinking and cooking, as hot water can contain higher levels of metals from pipes. Have your home tested if it was built before 1986 to check for lead plumbing. Review your annual Consumer Confidence Report (water quality report) from your utility to stay informed about local water quality trends. Pregnant women, families with young children, and immunocompromised individuals should consult healthcare providers about water safety precautions specific to their situation.
Based on detected contaminants
Best for Sierra Vista. Removes 95-99% of contaminants including heavy metals, PFAS, and nitrates.
Good for Sierra Vista. Removes chlorine, improves taste, and filters many organic compounds.
Lead detected in Sierra Vista. Ensure any filter is NSF/ANSI 53 certified for lead removal.
Past violations for Sierra Vista's water system
reporting
Nitrite - 2/4/2024
ResolvedSierra Vista Water Quality Score
Based on EPA contaminant data and compliance records
Even with good water quality, many families choose to filter their water for extra peace of mind.
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Based on contaminants detected in your water, these resources may be helpful:
Explore detailed information about each contaminant detected in Sierra Vista's water:
View All Contaminants →Find the right filter for your Sierra Vista water quality needs:
Understand the contaminants that may be present in Sierra Vista's water supply and their health effects.
Understand your water better with our in-depth guides on contaminants, filtration, and water safety.
Yes, Sierra Vista's tap water generally meets EPA safety standards with a quality score of 93/100 (Grade A). However, individual home conditions may vary.
Sierra Vista's water has been tested for 10 contaminants. All tested contaminants are within safe limits.
Based on Sierra Vista's water quality profile, we recommend a reverse osmosis system for the most comprehensive filtration. View our water filter comparison for recommendations.
Sierra Vista's primary water system (SIERRA VISTA WATER SYSTEM) sources water from a combination of sources, serving 41,468 residents.