ZIP Code 92656 Water Quality Report

Aliso Viejo, CA · Orange County County

Safety Score

Water Safety Grade

Good — Minor issues on record

Health Violations

Total Violations

Lead Risk

Low

Contaminants

About Tap Water in ZIP Code 92656

Tap water in ZIP code 92656 (Aliso Viejo, CA) meets all federal safety standards and earns a solid B grade (score: 73/100). Served by MOULTON NIGUEL WATER DISTRICT, the water system has maintained general compliance with EPA Safe Drinking Water Act regulations, with only minor issues on record.

Water System

MOULTON NIGUEL WATER DISTRICT

EPA ID: CA3010073

Water Source

Surface Water

Population Served

170,236 residents

County

Orange County County, California

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Lead Levels in ZIP 92656

EPA action level: 15 ppb | Public health goal: 0 ppb

Lead Data Not Available

Lead testing data was not found in EPA records for ZIP code 92656. This may occur with very small systems or systems that report under a parent utility. Contact MOULTON NIGUEL WATER DISTRICT directly to request lead testing results or a copy of their Consumer Confidence Report.

Lead exposure risk in 92656 is rated Low. EPA models estimate a 20% probability of lead exposure risk in this ZIP code based on housing age, infrastructure age, and water system data. This rating reflects newer infrastructure, lower housing age, and/or low detected lead levels. Standard precautions — flushing taps before use, using filtered water for infants — are still recommended.

Lead Exposure Risk Rating

Low

Lead Exposure Probability

EPA model estimate based on housing age and infrastructure

20%

Note: Lead levels above are the 90th percentile from EPA monitoring — meaning 90% of samples were at or below this level. Even "undetected" tap water lead doesn't account for lead leaching from home plumbing. If your home was built before 1986, individual tap testing is recommended.

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Violation History

Past 5 years — EPA SDWIS data

MOULTON NIGUEL WATER DISTRICT has recorded zero violations in the EPA compliance database over the past 5 years — a strong indicator of consistent regulatory compliance and careful monitoring.

Total Violations (5 yr)

Health-Based Violations

Unresolved Violations

Boil Water Advisories

Compliance Risk

Unknown

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Contaminants Detected

Contaminants with health-based violations on record

No health-based contaminant violations are on record for ZIP code 92656. This means EPA monitoring has not found levels of regulated contaminants exceeding the Maximum Contaminant Levels (MCLs) set under the Safe Drinking Water Act — a positive indicator of water quality compliance.

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Water Source & Environmental Factors

Surface Water

This system draws water from lakes, rivers, or reservoirs. Surface water is treated to remove sediment, microorganisms, and chemical contaminants before reaching taps.

Water Source Type

Surface Water

EPA Radon Zone

Lower potential

Zone 3

Annual Flood Risk Cost

Estimated annual flood-related costs per property

Energy Burden

% of household income spent on energy — indicator of older infrastructure

2.71%

EPA Radon Zone 3 — lower radon potential, though the EPA still recommends testing all homes.

🛡 What Should You Do? — ZIP 92656 Recommendations

✓

Your water quality is good

Your water meets all EPA health standards. Standard precautions are sufficient for most residents.

✓ Run cold water for 30 seconds each morning before use — especially if pipes are old
✓ Request your annual Consumer Confidence Report from MOULTON NIGUEL WATER DISTRICT
✓ If your home was built before 1986, consider testing your own tap for lead
✓ Use a pitcher filter (NSF/ANSI 42 certified) for improved taste

Frequently Asked Questions — ZIP 92656 Water Quality

Is tap water safe to drink in ZIP code 92656?+

Yes — tap water in 92656 (Aliso Viejo, CA) currently meets all federal EPA standards with a water safety grade of B. No health-based violations are on record in the past 5 years. You can drink your tap water with confidence, though running the tap for 30 seconds in the morning is always a good practice.

What is the lead level in 92656 tap water?+

Lead level data from EPA monitoring is not available for 92656. Contact MOULTON NIGUEL WATER DISTRICT directly for the most recent lead testing results.

Who provides tap water to 92656?+

Tap water in ZIP code 92656 is provided by MOULTON NIGUEL WATER DISTRICT (EPA ID: CA3010073). This system serves approximately 170,236 residents. You can contact them directly for Consumer Confidence Reports, current advisories, and billing information.

What is the water source for 92656?+

ZIP code 92656 is served by surface water. Surface water systems draw from rivers, lakes, or reservoirs and must meet strict EPA treatment requirements including filtration and disinfection.

Does 92656 have any active water quality violations?+

No active violations are on record for ZIP code 92656. EPA data shows this water system is currently in compliance with Safe Drinking Water Act standards.

How do I get a copy of my water quality report for 92656?+

Your water utility — MOULTON NIGUEL WATER DISTRICT — is required by law to send you an annual Consumer Confidence Report (CCR) by July 1 each year. You can also request it directly from the utility or find it online by searching "MOULTON NIGUEL WATER DISTRICT Consumer Confidence Report." The EPA's ECHO database also has historical compliance data.

What water filter should I use in 92656?+

The right filter depends on what contaminants are present. For lead, look for a filter certified to NSF/ANSI Standard 53. For chlorine byproducts (like THMs), NSF/ANSI 42 filters work well. For a broad range of contaminants including PFAS, look for NSF/ANSI 58 (reverse osmosis) systems. For ZIP code 92656, with a clean compliance record, a standard carbon block filter meeting NSF/ANSI 42 is a good choice for taste and as a precaution.

Is 92656 tap water safe for babies and infants?+

Infants are especially vulnerable to lead, nitrates, and microbial contaminants in drinking water. Current EPA data for 92656 shows no available lead data — we recommend using a certified NSF/ANSI 53 lead filter as a precaution for infant formula. Always consult your pediatrician for guidance specific to your child's health.

Data Sources & Methodology

Water quality data for ZIP code 92656 is compiled from the EPA Safe Drinking Water Information System (SDWIS), EPA ECHO enforcement database, UCMR5 unregulated contaminant monitoring, and Consumer Confidence Reports filed by MOULTON NIGUEL WATER DISTRICT. Safety scores are composite metrics derived from violation history, lead levels, enforcement actions, and infrastructure risk indicators. Data reflects a 5-year monitoring window. Last dataset update: 2024. View EPA source data →