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

ZIP Code 94519 Water Quality & Testing Report

Concord, 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 94519 (Concord, CA)?

Yes, tap water in ZIP code 94519 (Concord, CA) is safe to drink under EPA Safe Drinking Water Act standards. Supplied by Contra Costa Water District, the area earns an EPA Safety Grade of B (79/100) with 1 health violations, 3.1 ppb lead, and hard (127 mg/L / 7.4 GPG) water.

Safety Score
B

Water Safety Grade

Good — Minor issues on record

Health Violations

1

Total Violations

4

Lead Risk

High

Contaminants

1

⚠

Active Water Quality Issues Detected

EPA records show 2 unresolved violations. Contact Contra Costa Water District for current status.

About Tap Water in ZIP Code 94519

Tap water in ZIP code 94519 (Concord, CA) is distributed by Contra Costa Water District (EPA ID: CA0710003), serving approximately 198,000 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 79/100.

Water System

Contra Costa Water District

EPA ID: CA0710003

Water Source

Surface Water

Population Served

198,000 residents

County

Contra Costa County County, California

🧪

Lead Levels in ZIP 94519

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

Lead Level: 3.1 ppb — Very Low

The 90th percentile lead level in 94519 is 3.1 ppb. This meets the EPA action level of 15 ppb. Health experts recommend a target of 0 ppb for optimal safety.

Lead exposure risk in 94519 is rated High. EPA models estimate a 61% exposure probability based on housing and infrastructure age.

Lead Level (90th percentile)
3.10 ppb (0.0031 mg/L)
Copper (Consumer Confidence Report)

From annual CCR filing

0.2 ppb
Lead Exposure Risk Rating
High
Lead Exposure Probability

EPA model estimate based on housing age and infrastructure

61%
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: Hard7.4 GPG · 127 mg/L

Water in ZIP 94519 is Hard (127 mg/L / 7.4 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

7.4 GPG
Hardness (PPM / mg/L)

Parts per million CaCO3

127 mg/L
Appliance Scaling Risk
High / Severe

Official EPA SDWIS Database Entry

Utility: Contra Costa Water District · PWSID: CA0710003

Verify on EPA.gov
📋

Violation History

Past 5 years — EPA SDWIS data

Contra Costa Water District has recorded 1 health-based violation out of 4 total violations over the past 5 years. 2 violations remain unresolved in EPA tracking records.

Total Violations (5 yr)
4
Health-Based Violations
1
Unresolved Violations
2
Boil Water Advisories
0
Compliance Risk
High

Regulatory compliance risk for this utility is rated High based on past reporting and enforcement records.

⚗️

Contaminants Detected

Contaminants with health-based violations on record

EPA records identify 1 contaminant with health-based violations in the past 5 years: Stage 2 DBP Rule.

Stage 2 DBP Rule

From Consumer Confidence Report:

Chlorite (0.3 mg/L*); Manganese (101 μg/L); Odor-threshold (2 units)

⚖ Enforcement Actions

EPA or state regulators have issued 4 enforcement actions to address compliance lapses.
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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
Sacramento-San Joaquin River Delta (surface water from four intake locations: Old River, Rock Slough, Mallard Slough, Middle River); Los Vaqueros Reservoir storage
EPA Radon Zone

Moderate potential

Zone 2
Annual Flood Risk Cost

Estimated annual flood-related costs per property

$0
Energy Burden

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

2.95%

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

Water Quality Testing in ZIP 94519

Tap Water & Well Testing Recommendations

Residents in ZIP code 94519 served by Contra Costa Water District 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 94519 Recommendations

  • ✓ Run cold water for 30 seconds each morning before use — especially if pipes are old
  • ✓ Request your annual Consumer Confidence Report from Contra Costa 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

Recommended Taste & Safety Filter:

🚰

NSF/ANSI 53 Certified Pitcher Filter

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

Filter Selection Guide →

Frequently Asked Questions — ZIP 94519 Water Quality

Is tap water safe to drink in ZIP code 94519?+
Yes — tap water in 94519 (Concord, 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 94519 (Concord, CA)?+
To test water quality in ZIP 94519, 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 94519?+
Tap water in 94519 is classified as Hard with an estimated mineral hardness of 127 mg/L (7.4 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 94519?+
Yes. Unlike municipal systems, private wells in 94519 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 94519 tap water?+
The 90th percentile lead level in 94519 is 3.1 ppb. The EPA action level is 15 ppb. This is below the EPA action level.
Is there an active boil water notice in 94519?+
There are currently no active boil water advisories on record for 94519. Water treatment systems are operating within normal parameters.
Who provides tap water to 94519?+
Tap water in ZIP code 94519 is provided by Contra Costa Water District (EPA ID: CA0710003), serving approximately 198,000 residents.
What water filter should I use in 94519?+
Based on water metrics for 94519, we recommend Reverse Osmosis (PFAS & Lead). Look for certifications such as NSF/ANSI 58 (Reverse Osmosis), NSF/ANSI 53 (Lead & VOCs), NSF/ANSI P473 (PFAS/PFOS).

Data Sources & Methodology

Water quality data for ZIP code 94519 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 Contra Costa 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 →