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WaterSafeCheck

ZIP Code 94660 Water Quality Report

Oakland, CA · Alameda County County

Safety Score
B

Water Safety Grade

Good — Minor issues on record

Health Violations

1

Total Violations

2

Lead Risk

N/A

Contaminants

1

⚠

Active Water Quality Issues Detected

EPA records show 2 unresolved violations. Contact East Bay Municipal Utility District for current status.

About Tap Water in ZIP Code 94660

Tap water in ZIP code 94660 (Oakland, CA) meets all federal safety standards and earns a solid B grade (score: 78/100). Served by East Bay Municipal Utility District, the water system has maintained general compliance with EPA Safe Drinking Water Act regulations, with only minor issues on record.

Water System

East Bay Municipal Utility District

EPA ID: CA0110005

Water Source

Surface Water

Population Served

1,442,800 residents

County

Alameda County County, California

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Lead Levels in ZIP 94660

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

Lead Level: 3.3 ppb — Very Low

The 90th percentile lead level in 94660 is 3.3 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)
3.30 ppb (0.0033 mg/L)
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

East Bay Municipal Utility District has recorded 1 health-based violation in the past 5 years. A single health violation means the water exceeded an EPA maximum contaminant level (MCL) at some point. Most water systems resolve these quickly, but residents should review the Consumer Confidence Report for details. 2 violations are 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)
2
Health-Based Violations
1
Unresolved Violations
2
Boil Water Advisories
0
Compliance Risk
Low

Regulatory compliance risk for East Bay Municipal Utility 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

EPA records identify 1 contaminant associated with health-based violations in ZIP code 94660: E. coli. These contaminants exceeded the Maximum Contaminant Levels (MCLs) established by the EPA under the Safe Drinking Water Act at some point in the 5-year monitoring period. The presence of these violations does not necessarily mean water is currently unsafe — water systems are often required to increase monitoring and treatment when violations occur. Review the annual Consumer Confidence Report for the most current status.

E. coli

From Consumer Confidence Report:

Lead (13.3 ppb); Chloramine as chlorine (3.73 ppm); Haloacetic acids, 5 species (53 ppb); Trihalomethanes (68 ppb); Specific Conductance (530 μS/cm)

⚖ Enforcement Actions

EPA or state regulators have issued 2 enforcement actions against East Bay Municipal Utility District. Enforcement actions are formal compliance orders or penalties issued when a utility fails to address violations within required timeframes.
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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
Mokelumne River (Pardee Reservoir), Sacramento River (drought supply), local runoff blended at terminal reservoirs (Briones, San Pablo, Upper San Leandro)
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 94660 Recommendations

  • ✓ Run cold water for 30 seconds each morning before use — especially if pipes are old
  • ✓ Request your annual Consumer Confidence Report from East Bay Municipal Utility 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 94660 Water Quality

Is tap water safe to drink in ZIP code 94660?+
Yes — tap water in 94660 (Oakland, 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 94660 tap water?+
The 90th percentile lead level in 94660 is 3.3 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 94660?+
Tap water in ZIP code 94660 is provided by East Bay Municipal Utility District (EPA ID: CA0110005). This system serves approximately 1,442,800 residents. You can contact them directly for Consumer Confidence Reports, current advisories, and billing information.
What is the water source for 94660?+
ZIP code 94660 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 94660 have any active water quality violations?+
Yes — there are currently 2 unresolved violations on record for this water system. Unresolved violations indicate issues that have not yet been formally corrected in EPA tracking systems. Contact East Bay Municipal Utility District for the latest update.
How do I get a copy of my water quality report for 94660?+
Your water utility — East Bay Municipal Utility 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 "East Bay Municipal Utility District Consumer Confidence Report." The EPA's ECHO database also has historical compliance data.
What water filter should I use in 94660?+
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 94660, with detected contaminants including E. coli, a multi-stage filter or reverse osmosis system is recommended.
Is 94660 tap water safe for babies and infants?+
Infants are especially vulnerable to lead, nitrates, and microbial contaminants in drinking water. Current EPA data for 94660 shows a lead level of 3.3 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 94660 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 East Bay Municipal Utility 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 →