San Joaquin County, California
44 ZIP codes · Avg score 85/100 · Grade A · Updated
ZipCheckup grade for San Joaquin County: A.
No federal data flags a major home-safety concern for this ZIP.
Although county size varies, San Joaquin County's 44 ZIP codes share reliably safe tap water records and above-average compliance scores.
How San Joaquin County Compares
How San Joaquin County Compares
San Joaquin County scores 9 points above the California state average (76/100) and 12 points above the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
ZIP Code Risk Map
Water Quality Map: San Joaquin County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.4 (asthma 9.5%, diabetes 12.3%)
Estimated additional annual cost per homeowner: $1,623, driven primarily by flood
56.3% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↓ Improving trendEPA violation counts by year across San Joaquin County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 54 violations. Past 5 years: 91 total (91 health-based). Health-based violations are declining versus the prior 2-year window.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,623
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
262,396 housing units in San Joaquin County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in San Joaquin County
Remediation costs are relatively manageable for most homeowners in San Joaquin County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for San Joaquin County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving San Joaquin County
8 community water systems serving San Joaquin County.
- B
- B
- B
- A
- B
Show all 8 water systems
- B
- B
34 total water systems serve San Joaquin County.
Systems with the most violations in San Joaquin County
3 water systems with recorded EPA violations.
- B
- B
All ZIP Codes in San Joaquin County
44 ZIP codes tracked in San Joaquin County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 95304 | Tracy | 100 | A | 0 | $869K |
| 2 | 95320 | Escalon | 100 | A | 0 | $490K |
| 3 | 95376 | Tracy | 100 | A | 0 | $588K |
| 4 | 95391 | Tracy | 100 | A | 0 | $860K |
| 5 | 95202 | Stockton | 83 | B | 0 | $322K |
| 6 | 95203 | Stockton | 83 | B | 0 | $350K |
| 7 | 95204 | Stockton | 83 | B | 0 | $358K |
| 8 | 95211 | Stockton | 83 | B | 0 | — |
| 9 | 95215 | Stockton | 83 | B | 0 | $379K |
| 10 | 95258 | Woodbridge | 83 | B | 0 | $554K |
| 11 | 95330 | Lathrop | 83 | B | 1 | $605K |
| 12 | 95337 | Manteca | 83 | B | 1 | $611K |
| 13 | 95366 | Ripon | 83 | B | 1 | $673K |
| 14 | 95205 | Stockton | 81 | B | 4 (2 health) | $289K |
| 15 | 95206 | Stockton | 81 | B | 4 (2 health) | $389K |
| 16 | 95207 | Stockton | 81 | B | 4 (2 health) | $409K |
| 17 | 95209 | Stockton | 81 | B | 4 (2 health) | $465K |
| 18 | 95210 | Stockton | 81 | B | 4 (2 health) | $337K |
| 19 | 95212 | Stockton | 81 | B | 4 (2 health) | $499K |
| 20 | 95219 | Stockton | 81 | B | 4 (2 health) | $540K |
| 21 | 95231 | French Camp | 81 | B | 4 (2 health) | $478K |
| 22 | 95240 | Lodi | 81 | B | 4 (2 health) | $444K |
| 23 | 95242 | Lodi | 81 | B | 4 (2 health) | $550K |
| 24 | 95336 | Manteca | 81 | B | 5 (2 health) | $523K |
| 25 | 95201 | Stockton | — | — | — | |
| 26 | 95208 | Stockton | — | — | — | |
| 27 | 95213 | Stockton | — | — | — | |
| 28 | 95214 | Stockton | — | — | — | |
| 29 | 95220 | Acampo | — | — | $719K | |
| 30 | 95227 | Clements | — | — | $730K | |
| 31 | 95230 | Farmington | — | — | 0 | $611K |
| 32 | 95234 | Holt | — | — | — | |
| 33 | 95236 | Linden | — | — | $648K | |
| 34 | 95237 | Lockeford | — | — | 0 | $423K |
| 35 | 95241 | Lodi | — | — | — | |
| 36 | 95253 | Victor | — | — | — | |
| 37 | 95267 | Stockton | — | — | — | |
| 38 | 95269 | Stockton | — | — | — | |
| 39 | 95296 | Stockton | — | — | — | |
| 40 | 95297 | Stockton | — | — | — | |
| 41 | 95377 | Tracy | — | — | 0 | $774K |
| 42 | 95378 | Tracy | — | — | — | |
| 43 | 95632 | Galt | — | — | 2 (1 health) | $488K |
| 44 | 95686 | Thornton | — | — | $430K |
Recommended Buyer Guides for San Joaquin County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations - federal data drives the order, not retailer arrangements.
- Best Lead Paint Test Kits — 56.3% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for San Joaquin County, California
Overview
San Joaquin County in California covers 44 tracked ZIP records with an average Home Safety Score of A (85/100) across 24 scored records.
15 of 28 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 3 health-based violations appear in the available health breakdown.
← Back to California Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.