Temecula, CA: 35 Violations — 79/100 (2026)
5 ZIP codes · 7 water systems · Updated 2026-06-03
Across Temecula, EPA monitoring data shows low violation rates and healthy safety margins — a pattern that places the city well above CA's average for drinking water compliance across recent reporting cycles.
How Temecula Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Temecula, CA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Distribution of water safety grades across Temecula.
Temecula Water: The Quick Version
- Your city's water systems recorded 35 violations in the past 5 years.
- Average lead level: 0.0018 mg/L.
- Homes built before 1986: 21% — older plumbing may contain lead solder.
- Estimated remediation: $1,820 per household.
- CDC health risk index: 12.09 — above typical levels.
Water Systems Serving Temecula
Federal drinking water records identify 7 systems in Temecula, CA. The leading 3 providers serve the largest share of residential connections, each operating as a separate entity with its own rate authority, infrastructure management, and EPA compliance obligations — so service conditions are not uniform city-wide.
Overview
We track water quality and home safety data for 5 ZIP codes in Temecula, California (population ~127,714), covering 7 community water systems serving approximately 917,003 people region-wide.
5 of 5 ZIP codes (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Temecula: B (79/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Temecula water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0018 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 5 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 42 | 5 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 92589 | B | 7 | 0 | Rancho California Water District |
| 92590 | B | 7 | 0 | Rancho California Water District |
| 92591 | B | 7 | 0 | Rancho California Water District |
| 92592 | B | 7 | 0 | Rancho California Water District |
| 92593 | B | 7 | 0 | Rancho California Water District |
All ZIP Codes in Temecula
- 92589 [B] — 7 violations
- 92590 [B] — 7 violations
- 92591 [B] — 7 violations
- 92592 [B] — 7 violations
- 92593 [B] — 7 violations
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
Updated daily.
CDC Health Data for Temecula
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Temecula
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Temecula's Housing Stock?
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Temecula has a newer housing profile — median build year 1998, placing most homes after the 1986 lead-solder ban.
Most homes in Temecula were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Temecula: Remediation Cost in Perspective
Low proportionality — that's the Temecula picture when remediation costs are placed against typical home equity.
Remediation costs in Temecula are relatively low compared to home values. The $940–$2,880 estimated range is a small fraction of median property value. Home values are 10% below the California average.
Protecting Children from Lead in Temecula
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Where pre-rule stock represents a smaller fraction of the inventory — 21% across Temecula — the structural drivers of household exposure run thinner. Aggregate readings under the federal benchmark reinforce that picture, with one-home draws remaining the only direct measurement for a specific address.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Temecula
Flood exposure in Temecula is meaningful by NFIP measures — 23 claims on record and 80% of ZIP codes carrying FEMA flood zone designations. That level of activity makes flood history a relevant factor when evaluating local water quality over time.
Temecula has a moderate flood history with 23 FEMA claims averaging $5,407 per payout. 80% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,820</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Temecula, CA