Water Quality in Valencia, CA: 63 Violations — Grade D
Grade D · Score 43/100 · 2 water systems · Updated 2026-05-03
Valencia's water has significant violations. Water testing and filtration are recommended.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Valencia, CA has 63 violations in the EPA compliance history — breakdown below.
Water Quality by ZIP Code in Valencia
Water quality varies across Valencia's 3 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 91385 | F | 35 | 21 | 19 | View report → |
| 91354 | D | 47 | 21 | 19 | View report → |
| 91355 | D | 47 | 21 | 19 | View report → |
Violation Trend
EPA violations recorded for water systems serving Valencia.
Water Quality Overview
Valencia, California receives a water quality grade of D with an overall score of 43 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 2 water systems serving Valencia have accumulated 63 EPA violations, including 57 health-based violations. These violations are tracked across 3 ZIP codes serving approximately 282 people.
What Grade D Means
A grade of D indicates significant compliance issues. Valencia's water systems have accumulated violations that suggest ongoing water quality challenges. Residents should check their specific ZIP code report and consider water testing or filtration.
Lead Levels
The average 90th percentile lead level across Valencia water systems is 0.0096 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
Radon Risk
Valencia is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Valencia
Valencia is served by 2 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 282 people across 3 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 6 enforcement actions against water systems serving Valencia. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Valencia
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR — your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test — certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration — NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories — monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Valencia Water Systems
The following contaminants have been detected or caused violations across Valencia's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Barium | Inorganic | 2 mg/L | 54 | 3 | Yes |
| Stage 2 DBP Rule | Treatment Technique | N/A | 6 | 3 | Yes |
| Stage 1 DBP Rule | Treatment Technique | N/A | 3 | 3 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Valencia:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2022 | 12 | 12 |
| 2023 | 12 | 12 |
| 2024 | 15 | 15 |
| 2025 | 6 | 6 |
Violations have decreased from 12 in 2022 to 6 in 2025, indicating improving compliance.
EPA Enforcement History
The EPA and state regulators have taken 2 enforcement actions against water systems serving Valencia. Recent actions:
| Date | Action Type |
|---|---|
| 2022-09-21 | State Order Extension |
| 2022-01-14 | State Filed Suit |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2022-09-21.
Valencia vs. Nearby California Cities
How Valencia's water quality compares to similar cities in California:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Valencia | D | 63 | 2 | 282 |
| Standard | B | 2 | 1 | 282 |
| Hornbrook | A | 3 | 1 | 280 |
| Mount Hamilton | B | 0 | 1 | 284 |
Water Quality by ZIP Code in Valencia
Water quality varies across Valencia's ZIP codes. The table below shows the worst-scoring and best-scoring areas:
Common Questions About Valencia Water
These are the most common questions residents search for about water quality in Valencia, California:
Is Valencia water hard or soft? Water hardness varies by source. Valencia's 2 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Valencia tap water? Valencia's water receives a grade of D (43/100). There are 57 health-based violations — consider filtration.
What is the best water filter for Valencia? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Valencia vs. California Average
Understanding how Valencia compares to the broader California average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below — water quality can vary significantly even within Valencia.
ZIP Codes in Valencia
Valencia spans 3 ZIP codes. The ZIP with the lowest water quality score is 91354. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.