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WaterSafeCheck

ZIP Code 94508 Water Quality Report

Angwin, CA · Napa County County

Safety Score
A

Water Safety Grade

Excellent — Meets all EPA standards

Health Violations

4

Total Violations

4

Lead Risk

High

Contaminants

1

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Active Water Quality Issues Detected

EPA records show 0 unresolved violation. Contact Pacific Union College for current status.

About Tap Water in ZIP Code 94508

Tap water in ZIP code 94508 (Angwin, CA) is among the safest in the country. Served by Pacific Union College, this area earned a water safety grade of A with a composite score of 86/100 — indicating full regulatory compliance and low contaminant risk across EPA monitoring periods.

Water System

Pacific Union College

EPA ID: CA2810012

Water Source

Ground Water

Population Served

1,958 residents

County

Napa County County, California

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Lead Levels in ZIP 94508

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

Lead Level: 7.0 ppb — Below Action Level

The 90th percentile lead level in 94508 is 7.0 ppb, below the EPA action level of 15 ppb but above what many health experts consider ideal. The CDC and EPA both affirm there is no safe level of lead exposure for children. Families with young children or pregnant women should consider a certified NSF/ANSI 53 water filter, and request lead testing of their home's tap water.

Lead exposure risk in 94508 is rated High. EPA models estimate a 69% probability of lead exposure risk in this ZIP code based on housing age, infrastructure age, and water system data. This typically reflects older housing stock built before 1986 (when lead pipes were banned), aging distribution infrastructure, or detected lead levels in water samples. Families should prioritize getting their tap water tested independently and installing a certified lead-reducing filter.

Lead Level (90th percentile)
7.00 ppb (0.007 mg/L)
Lead Exposure Risk Rating
High
Lead Exposure Probability

EPA model estimate based on housing age and infrastructure

69%
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

Pacific Union College has recorded 4 health-based violations in the past 5 years. Multiple health violations suggest recurring compliance challenges. Residents should request a copy of the annual Consumer Confidence Report to understand what contaminants were involved and what corrective actions were taken.

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

Regulatory compliance risk is rated Critical — the highest risk category. Pacific Union College has an extensive history of unresolved violations and enforcement actions. Independent water testing is highly recommended.

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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 94508: Haloacetic Acids (HAA5). 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.

Haloacetic Acids (HAA5)

⚖ Enforcement Actions

8 enforcement actions have been issued against Pacific Union College — 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
EPA Radon Zone

Lower potential

Zone 3
Annual Flood Risk Cost

Estimated annual flood-related costs per property

$0
Energy Burden

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

3.13%

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

🛡 What Should You Do? — ZIP 94508 Recommendations

  • ✓ Run cold water for 30 seconds each morning before use — especially if pipes are old
  • ✓ Request your annual Consumer Confidence Report from Pacific Union College
  • ✓ 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 94508 Water Quality

Is tap water safe to drink in ZIP code 94508?+
Yes — tap water in 94508 (Angwin, CA) currently meets all federal EPA standards with a water safety grade of A. 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 94508 tap water?+
The 90th percentile lead level in 94508 is 7.0 ppb (parts per billion). The EPA action level is 15 ppb. This is below the action level, but some health experts recommend a lead filter for families with young children.
Who provides tap water to 94508?+
Tap water in ZIP code 94508 is provided by Pacific Union College (EPA ID: CA2810012). This system serves approximately 1,958 residents. You can contact them directly for Consumer Confidence Reports, current advisories, and billing information.
What is the water source for 94508?+
ZIP code 94508 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 94508 have any active water quality violations?+
There are 4 health-based violations in the past 5-year record, but no currently unresolved violations according to EPA data. This means past issues have been addressed.
How do I get a copy of my water quality report for 94508?+
Your water utility — Pacific Union College — 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 "Pacific Union College Consumer Confidence Report." The EPA's ECHO database also has historical compliance data.
What water filter should I use in 94508?+
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 94508, with detected contaminants including Haloacetic Acids (HAA5), a multi-stage filter or reverse osmosis system is recommended.
Is 94508 tap water safe for babies and infants?+
Infants are especially vulnerable to lead, nitrates, and microbial contaminants in drinking water. Given the detected lead level of 7.0 ppb in 94508, we recommend using a certified NSF/ANSI 53 water filter or certified bottled water for preparing infant formula. Always consult your pediatrician for guidance specific to your child's health.

Data Sources & Methodology

Water quality data for ZIP code 94508 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 Pacific Union College. 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 →