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WaterSafeCheck

ZIP Code 91734 Water Quality Report

El Monte, CA · Los Angeles County County

Safety Score
B

Water Safety Grade

Good — Minor issues on record

Health Violations

0

Total Violations

5

Lead Risk

N/A

Contaminants

0

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Active Water Quality Issues Detected

EPA records show 1 unresolved violation. Contact San Gabriel Valley Water Company-el Monte for current status.

About Tap Water in ZIP Code 91734

Tap water in ZIP code 91734 (El Monte, CA) meets all federal safety standards and earns a solid B grade (score: 79/100). Served by San Gabriel Valley Water Company-el Monte, the water system has maintained general compliance with EPA Safe Drinking Water Act regulations, with only minor issues on record.

Water System

San Gabriel Valley Water Company-el Monte

EPA ID: CA1910039

Water Source

Ground Water

Population Served

248,000 residents

County

Los Angeles County County, California

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Lead Levels in ZIP 91734

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

Lead Level: 0.5 ppb — Very Low

The 90th percentile lead level in 91734 is 0.5 ppb, well below the EPA action level of 15 ppb. While this is a reassuring result, the EPA's public health goal for lead is actually zero — no amount of lead is considered completely safe, particularly for children under 6 and pregnant women. Running your tap for 30 seconds before use and using a certified NSF/ANSI 53 filter adds an extra layer of protection.
Lead Level (90th percentile)
0.50 ppb (0.0005 mg/L)
Copper (Consumer Confidence Report)

From annual CCR filing

0.3 ppb
Lead Exposure Risk Rating
Unknown
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

San Gabriel Valley Water Company-el Monte has recorded 5 violations, but none are health-based. Administrative or reporting violations don't directly indicate unsafe water, but they do signal gaps in documentation or monitoring procedures. 1 violation is currently unresolved — meaning the issue has not yet been formally corrected in EPA records. This is a serious concern that residents should follow up on with their water utility.

Total Violations (5 yr)
5
Health-Based Violations
0
Unresolved Violations
1
Boil Water Advisories
0
Compliance Risk
Moderate

Regulatory compliance risk is rated Moderate. San Gabriel Valley Water Company-el Monte has had occasional lapses in compliance but generally meets Safe Drinking Water Act 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 91734. 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.

From Consumer Confidence Report:

Radium 228 (0.042 pCi/L*); Chromium (0.5 ppb*); Chlorate (140 ppb*); Perfluorooctanesulfonic Acid (PFOA) (2 ppt)

⚖ Enforcement Actions

5 enforcement actions have been issued against San Gabriel Valley Water Company-el Monte — a high number that reflects sustained compliance struggles. Enforcement actions escalate from administrative orders to financial penalties when utilities repeatedly fail to meet safe drinking water standards.
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Water Source & Environmental Factors

Ground Water

This system draws water from underground aquifers. Groundwater is naturally filtered through soil and rock, but can still contain naturally occurring minerals like arsenic, radium, or nitrates.

Water Source Type
Ground Water
CCR Source Classification
Groundwater from Main San Gabriel Basin and Central Basin; Purchased surface water from Metropolitan Water District (Montebello South Service Area)
EPA Radon Zone

Moderate potential

Zone 2

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

🛡 What Should You Do? — ZIP 91734 Recommendations

  • ✓ Run cold water for 30 seconds each morning before use — especially if pipes are old
  • ✓ Request your annual Consumer Confidence Report from San Gabriel Valley Water Company-el Monte
  • ✓ 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 91734 Water Quality

Is tap water safe to drink in ZIP code 91734?+
Yes — tap water in 91734 (El Monte, 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 91734 tap water?+
The 90th percentile lead level in 91734 is 0.5 ppb (parts per billion). The EPA action level is 15 ppb. This is a low level, well below the EPA action level of 15 ppb.
Who provides tap water to 91734?+
Tap water in ZIP code 91734 is provided by San Gabriel Valley Water Company-el Monte (EPA ID: CA1910039). This system serves approximately 248,000 residents. You can contact them directly for Consumer Confidence Reports, current advisories, and billing information.
What is the water source for 91734?+
ZIP code 91734 is served by ground water. Groundwater systems draw from underground aquifers. While naturally filtered, groundwater can still contain naturally occurring contaminants such as arsenic, radium, or nitrates at elevated levels in some regions.
Does 91734 have any active water quality violations?+
Yes — there are currently 1 unresolved violation on record for this water system. Unresolved violations indicate issues that have not yet been formally corrected in EPA tracking systems. Contact San Gabriel Valley Water Company-el Monte for the latest update.
How do I get a copy of my water quality report for 91734?+
Your water utility — San Gabriel Valley Water Company-el Monte — 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 "San Gabriel Valley Water Company-el Monte Consumer Confidence Report." The EPA's ECHO database also has historical compliance data.
What water filter should I use in 91734?+
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 91734, 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 91734 tap water safe for babies and infants?+
Infants are especially vulnerable to lead, nitrates, and microbial contaminants in drinking water. Current EPA data for 91734 shows a lead level of 0.5 ppb — below the action level, but as an extra precaution, run your tap for 30 seconds before use and consider a certified lead filter for infant formula. Always consult your pediatrician for guidance specific to your child's health.

Data Sources & Methodology

Water quality data for ZIP code 91734 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 San Gabriel Valley Water Company-el Monte. 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 →