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Official EPA SDWIS Verified ReportWater Quality & Testing GuideHistorical Record: No Recorded SDWIS Violations

ZIP Code 94569 Water Quality & Testing Report

Port Costa, CA · Contra Costa County County · Updated for 2026

Public Health & Medical Notice: Drinking water quality data on this page reflects historical compliance records submitted under the Safe Drinking Water Act. This information does not constitute medical advice or a real-time safety guarantee. If you are pregnant, nursing, preparing infant formula, or immunocompromised, consult a healthcare provider. Boiling water kills biological pathogens, but does NOT remove chemical contaminants like lead, arsenic, or PFAS.
Quick EPA Verified Answer

Is Tap Water Safe to Drink in ZIP 94569 (Port Costa, CA)?

Yes, tap water in ZIP code 94569 (Port Costa, CA) is safe to drink under EPA Safe Drinking Water Act standards. Supplied by EAST BAY MUD, the area earns an EPA Safety Grade of B (73/100) with 0 health violations, 0 ppb lead, and hard (132 mg/L / 7.7 GPG) water.

Safety Score
B

Water Safety Grade

Good — Minor issues on record

Health Violations

0

Total Violations

0

Lead Risk

Very High

Contaminants

0

About Tap Water in ZIP Code 94569

Tap water in ZIP code 94569 (Port Costa, CA) is distributed by EAST BAY MUD (EPA ID: CA0110005), serving approximately 1,442,800 residents. Based on EPA Safe Drinking Water Act compliance records, this system receives a water safety grade of B with a composite quality score of 73/100.

Water System

EAST BAY MUD

EPA ID: CA0110005

Water Source

Surface Water

Population Served

1,442,800 residents

County

Contra Costa County County, California

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Lead Levels in ZIP 94569

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 94569. Contact EAST BAY MUD to request lead testing results.

Lead exposure risk in 94569 is rated Very High. EPA models estimate a 74% exposure probability based on housing and infrastructure age.

Lead Exposure Risk Rating
Very High
Lead Exposure Probability

EPA model estimate based on housing age and infrastructure

74%
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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Water Hardness & Mineral Content

Grains per gallon (GPG) & Parts per million (PPM / mg/L)

Classification: Hard7.7 GPG · 132 mg/L

Water in ZIP 94569 is Hard (132 mg/L / 7.7 GPG). Residents may notice white mineral spots on glassware, reduced soap efficiency, and mineral scale on faucets and showerheads.

Recommendation: An ion-exchange water softener or descaler is recommended to prolong the life of water heaters, dishwashers, and plumbing.
Hardness (GPG)

Grains per gallon

7.7 GPG
Hardness (PPM / mg/L)

Parts per million CaCO3

132 mg/L
Appliance Scaling Risk
High / Severe

Official EPA SDWIS Database Entry

Utility: EAST BAY MUD · PWSID: CA0110005

Verify on EPA.gov
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Violation History

Past 5 years — EPA SDWIS data

EAST BAY MUD has recorded zero violations in the EPA compliance database over the past 5 years.

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

Contaminants Detected

Contaminants with health-based violations on record

No health-based contaminant violations are on record for ZIP code 94569 under the Safe Drinking Water Act.

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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

$70

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

Water Quality Testing in ZIP 94569

Tap Water & Well Testing Recommendations

Residents in ZIP code 94569 served by EAST BAY MUD can test tap water or private well systems to verify water purity. Testing detects hidden contaminants before they impact family health.

Tap Water Testing Steps

  • 1.Conduct a certified lead check if your home was constructed before 1986.
  • 2.Use certified lab testing kits rather than uncalibrated test strips for regulated compliance.
  • 3.Sample water from both your kitchen faucet and water heater to compare line purity.

Private Well Testing Steps

  • •Test for Coliform bacteria and Nitrates annually.
  • •Test for heavy metals, radon, and PFAS every 3 years.
  • •Send samples to a state-certified drinking water laboratory recognized by California State Water Resources Control Board.
Certified Lab Testing: Always use an EPA-certified drinking water laboratory in CA for formal legal or real estate compliance testing.

🛡 What Should You Do? — ZIP 94569 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 MUD
  • ✓ 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

Recommended Taste & Safety Filter:

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NSF/ANSI 53 Certified Pitcher Filter

Best for removing aesthetic chlorine, odors, and low-level heavy metals.

Filter Selection Guide →

Frequently Asked Questions — ZIP 94569 Water Quality

Is tap water safe to drink in ZIP code 94569?+
Yes — tap water in 94569 (Port Costa, CA) meets EPA standards with a water safety grade of B. No health-based violations are on record in the past 5 years.
How do I get my water tested in ZIP 94569 (Port Costa, CA)?+
To test water quality in ZIP 94569, you can order a certified drinking water test kit or send water samples to an EPA/NELAP certified laboratory in CA. Certified testing checks for lead, coliform bacteria, nitrates, hardness, and PFAS that standard test strips miss. Contact California State Water Resources Control Board for a list of certified regional labs.
How hard is the tap water in 94569?+
Tap water in 94569 is classified as Hard with an estimated mineral hardness of 132 mg/L (7.7 GPG). An ion-exchange water softener or descaler is recommended to prolong the life of water heaters, dishwashers, and plumbing.
Should I test private well water in 94569?+
Yes. Unlike municipal systems, private wells in 94569 are not regulated by the EPA or local utilities. Private well owners should test their water annually for coliform bacteria and nitrates, and every 3 to 5 years for heavy metals (lead, arsenic) and volatile organic compounds.
What is the lead level in 94569 tap water?+
Lead level data is not available in EPA records for 94569. Contact your utility for details.
Is there an active boil water notice in 94569?+
There are currently no active boil water advisories on record for 94569. Water treatment systems are operating within normal parameters.
Who provides tap water to 94569?+
Tap water in ZIP code 94569 is provided by EAST BAY MUD (EPA ID: CA0110005), serving approximately 1,442,800 residents.
What water filter should I use in 94569?+
Based on water metrics for 94569, we recommend Lead & Microplastic Filter. Look for certifications such as NSF/ANSI 53 (Lead Reduction), NSF/ANSI 42 (Particulate/Taste).

Data Sources & Methodology

Water quality data for ZIP code 94569 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 MUD. 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 →