ZIP Code 92377 Water Quality Report

Rialto, CA · San Bernardino County County

Safety Score

Water Safety Grade

Good — Minor issues on record

Health Violations

Total Violations

Lead Risk

Moderate

Contaminants

About Tap Water in ZIP Code 92377

Tap water in ZIP code 92377 (Rialto, CA) meets all federal safety standards and earns a solid B grade (score: 75/100). Served by West Valley Water District, the water system has maintained general compliance with EPA Safe Drinking Water Act regulations, with only minor issues on record.

Water System

West Valley Water District

EPA ID: CA3610004

Water Source

Surface Water

Population Served

104,498 residents

County

San Bernardino County County, California

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Lead Levels in ZIP 92377

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 92377. This may occur with very small systems or systems that report under a parent utility. Contact West Valley Water District directly to request lead testing results or a copy of their Consumer Confidence Report.

Lead exposure risk in 92377 is rated Moderate. EPA models estimate a 33% probability of lead exposure risk in this ZIP code based on housing age, infrastructure age, and water system data. This may reflect a mix of older and newer housing stock and infrastructure. Families with young children should test their home's water and consider a certified NSF/ANSI 53 water filter.

Lead Exposure Risk Rating

Moderate

Lead Exposure Probability

EPA model estimate based on housing age and infrastructure

33%

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

West Valley 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

Low

Regulatory compliance risk for West Valley Water District is rated Low — indicating a consistent track record of meeting EPA reporting and treatment requirements.

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Contaminants Detected

Contaminants with health-based violations on record

No health-based contaminant violations are on record for ZIP code 92377. 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

CCR Source Classification

Surface Water

EPA Radon Zone

Moderate potential

Zone 2

Energy Burden

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

3.28%

EPA Radon Zone 2 — moderate radon potential. The EPA recommends testing your home regardless of zone designation.

🛡 What Should You Do? — ZIP 92377 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 West Valley 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 92377 Water Quality

Is tap water safe to drink in ZIP code 92377?+

Yes — tap water in 92377 (Rialto, 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 92377 tap water?+

Lead level data from EPA monitoring is not available for 92377. Contact West Valley Water District directly for the most recent lead testing results.

Who provides tap water to 92377?+

Tap water in ZIP code 92377 is provided by West Valley Water District (EPA ID: CA3610004). This system serves approximately 104,498 residents. You can contact them directly for Consumer Confidence Reports, current advisories, and billing information.

What is the water source for 92377?+

ZIP code 92377 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 92377 have any active water quality violations?+

No active violations are on record for ZIP code 92377. 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 92377?+

Your water utility — West Valley 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 "West Valley Water District Consumer Confidence Report." The EPA's ECHO database also has historical compliance data.

What water filter should I use in 92377?+

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 92377, 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 92377 tap water safe for babies and infants?+

Infants are especially vulnerable to lead, nitrates, and microbial contaminants in drinking water. Current EPA data for 92377 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 92377 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 West Valley 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 →