Water Quality in Temecula, CA: 35 Violations — Grade B
Grade B · Score 79/100 · 3 water systems · Updated 2026-05-03
Temecula's water is mostly safe. Minor violations exist but are primarily monitoring-related.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Temecula in CA has 35 EPA water violations documented — the compliance history below covers what was flagged and which local systems are associated with each finding.
Water Quality Map: Temecula, CA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Water Quality by ZIP Code in Temecula
Water quality varies across Temecula's 5 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 92590 | B | 75 | 7 | 0 | View report → |
| 92589 | B | 80 | 7 | 0 | View report → |
| 92591 | B | 80 | 7 | 0 | View report → |
| 92592 | B | 80 | 7 | 0 | View report → |
| 92593 | B | 80 | 7 | 0 | View report → |
Water Quality Overview
Temecula, California receives a water quality grade of B with an overall score of 79 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 3 water systems serving Temecula have accumulated 35 EPA violations (all monitoring/reporting type). These violations are tracked across 5 ZIP codes serving approximately 146,715 people.
What Grade B Means
A grade of B indicates good compliance with EPA drinking water standards. While not perfect, Temecula's water systems meet the vast majority of federal requirements. Minor violations may exist but typically relate to monitoring or reporting rather than health-based standards.
Lead Levels
The average 90th percentile lead level across Temecula water systems is 0.0018 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
Radon Risk
Temecula is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Temecula
Temecula is served by 3 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 146,715 people across 5 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 10 enforcement actions against water systems serving Temecula. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Temecula
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
EPA Enforcement History
The EPA and state regulators have taken 2 enforcement actions against water systems serving Temecula. Recent actions:
| Date | Action Type |
|---|---|
| 2022-03-10 | State Order Extension |
| 2022-02-11 | State Filed Suit |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2022-03-10.
Temecula vs. Nearby California Cities
How Temecula's water quality compares to similar cities in California:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Temecula | B | 35 | 3 | 146,715 |
| Placerville | B | 0 | 5 | 142,442 |
| Fullerton | A | 0 | 2 | 139,580 |
| Redondo Beach | C | 0 | 2 | 138,880 |
Recommended Water Filters for Temecula
Based on contaminants detected in Temecula's water supply, these filter types are recommended:
Granular Activated Carbon (GAC, whole-house or under-sink)
- Removes: Total Chlorine Residual
- Effectiveness: 95-99%
- Cost range: $100–$600
- Certification: NSF/ANSI 42
- Recommended products:
- Aquasana AQ-5200
- Waterdrop Chubby Pitcher
- Berkey Travel
Granular Activated Carbon (GAC, whole-house POE)
- Removes: Perfluorohexanesulfonic Acid (PFHxS)
- Effectiveness: 70-90%
- Cost range: $400–$2000
- Certification: NSF/ANSI 53, NSF/ANSI 401, NSF P473
- Recommended products:
- Waterdrop G3P800
- Aquasana EQ-1000 Rhino
- Clearly Filtered Pitcher
Water Quality by ZIP Code in Temecula
Water quality varies across Temecula's ZIP codes. The table below shows the worst-scoring and best-scoring areas:
| ZIP Code | Score | Grade | Violations | Health-Based |
|---|---|---|---|---|
| 92590 | 75 | B | 7 | 0 |
| 92589 | 80 | B | 7 | 0 |
| 92591 | 80 | B | 7 | 0 |
| 92592 | 80 | B | 7 | 0 |
| 92593 | 80 | B | 7 | 0 |
Common Questions About Temecula Water
These are the most common questions residents search for about water quality in Temecula, California:
Is Temecula water hard or soft? Water hardness varies by source. Temecula's 3 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Temecula tap water? Temecula's water receives a grade of B (79/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Temecula? Based on detected contaminants, a granular activated carbon (gac, whole-house or under-sink) filter is most recommended. See our Water Filter Matcher for personalized recommendations.
Temecula vs. California Average
Understanding how Temecula 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 Temecula.
ZIP Codes in Temecula
Temecula spans 5 ZIP codes. The ZIP with the lowest water quality score is 92589. 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.
Frequently Asked Questions
Your Water is Safe — Here's How to Keep It That Way
Grade B is excellent news. Here's what proactive homeowners do to maintain water quality:
Annual Water Testing
EPA recommends annual testing even with clean water. Home test kits: $20-$50. Catches changes before they become problems.
Maintenance Filtration
A basic carbon filter removes chlorine taste and catches emerging contaminants like PFAS that aren't yet fully regulated.
Plumbing Check
Even safe city water picks up lead from home pipes. If your home was built before 1986, a one-time pipe inspection is recommended.