Oceanside, CA Water Safety: 84/100 (2026)
7 ZIP codes · 8 water systems · Updated 2026-06-03
Water systems serving Oceanside hold a strong EPA compliance record — the city places among the better-performing areas in CA with few health-based violations on file.
How Oceanside Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Oceanside, CA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
How ZIP codes in Oceanside score across all safety grades.
What You Should Know About Oceanside Water
- Estimated remediation: $1,200 per household.
- CDC health risk index: 10.18.
Who Supplies Your Water in Oceanside
Throughout Oceanside, CA, water comes from one of 3 primary utilities out of 8 total systems — independent providers with different rate structures, infrastructure, and compliance records that vary across the service territory.
Overview
We track water quality and home safety data for 7 ZIP codes in Oceanside, California (population ~197,994), covering 8 community water systems serving approximately 512,714 people region-wide.
No EPA violations recorded across any ZIP codes in Oceanside — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Oceanside: B (84/100)
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
Oceanside water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Oceanside
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 7 ZIP codes
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 92049 | A | City of Oceanside, | 171,483 |
| 92051 | A | City of Oceanside, | 171,483 |
| 92052 | A | City of Oceanside, | 171,483 |
| 92054 | B | City of Oceanside, | 171,483 |
| 92056 | B | City of Oceanside, | 171,483 |
| 92057 | B | City of Oceanside, | 171,483 |
| 92058 | B | City of Oceanside, | 171,483 |
All ZIP Codes in Oceanside
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.
Health Outcomes in Oceanside
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
Cost Context: What Remediation Means for Oceanside Homeowners
Across Oceanside, the equity share taken up by estimated remediation is small — a favorable ratio for most property owners.
Remediation costs in Oceanside are relatively low compared to home values. The $800–$1,800 estimated range is a small fraction of median property value. Home values are 6% below the California average.
Flood & Climate Risk in Oceanside
182 FEMA flood insurance claims are on file for Oceanside, and 57% of local ZIP codes fall within federally designated flood zones — enough to put flood exposure on the planning radar, though short of the concentrated-risk threshold where treatment-system vulnerability becomes a primary consideration.
Oceanside has a moderate flood history with 182 FEMA claims averaging $7,823 per payout. 57% 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>$1,200</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 Oceanside, CA