Dixon, CA vs San Jose, CA
Which City Has Better Water Quality?
When comparing tap water quality between Dixon, CA and San Jose, CA, Dixon currently holds a narrow 4-point edge in average WaterQ score, with a score of 100 out of 100 versus 96 for San Jose. Both cities currently carry an A grade overall. A WaterQ score reflects an aggregate of EPA-reported violations, monitoring data, and compliance history across all public water systems serving each city, so a higher score generally indicates fewer recent violations and a stronger compliance record, though it does not guarantee that every tap in the city tests identically.
San Jose, CA is the larger of the two, with 3.4 million more residents than Dixon. San Jose is served by 44 public water systems, compared with 1 in Dixon — a difference of 43 systems. A larger number of systems often reflects a more fragmented distribution network spanning multiple utilities, suburbs, or rural service areas, while a single large utility serving a big population can benefit from economies of scale in treatment and monitoring, but may also face more complex, aging infrastructure to maintain.
For residents of either Dixon or San Jose, the most useful next step is to look up the specific water system that serves your address, since city-wide averages combine results from every system in the area. Visit the Dixon or San Jose city pages below for a breakdown of local systems, recent violations, and contaminant-specific data, or browse WaterQ's contaminants directory to learn what each measured substance means for health.
Detailed Comparison
| Metric | Dixon | San Jose |
|---|---|---|
| Water Quality Score | 100 | 96 |
| Grade | A | A |
| Water Systems | 1 | 44 |
| Population | 12,540 | 3,387,919 |
| County | ||
| State | CA | CA |
Analysis
Water Filtration Recommendations: Dixon & San Jose
Comparing point-of-use protection between Dixon and San Jose. If either water system has recorded disinfectant byproducts (THMs/HAAs), lead line risks, or hard minerals, a certified filter provides reliable household protection.
APEC Water Systems ROES-50 5-Stage Reverse Osmosis System
Removes up to 99% of 1,000+ contaminants including Lead, Chlorine, PFAS, Fluoride, Arsenic, and TDS.
Waterdrop G3P800 Tankless Reverse Osmosis System
800 GPD high capacity, 3:1 pure-to-drain ratio, smart LED faucet displaying real-time TDS and filter life.
Aquasana 3-Stage Under Sink Water Filter System (AQ-5300+)
Reduces 77 contaminants including 99.6% of Lead and PFOA/PFOS while retaining healthy minerals (calcium, magnesium).
Frizzlife Under Sink Water Filter System (MK99)
Directly hooks into cold water line with 0.5-micron precision. Quick-change twist-in filter cartridges.
ZeroWater 5-Stage 22-Cup Ready-Read Filter Dispenser
5-stage ion exchange removes 99.6% of total dissolved solids. Built-in digital TDS meter included.
Clearly Filtered Water Pitcher with Affinity Filtration
Independently tested against 365+ contaminants including PFAS, microplastics, lead, fluoride, and glyphosate.
Brita Elite Water Filter Pitcher (Monterey)
Reduces 99% of Lead and 30+ contaminants. Each Elite filter lasts 6 months (120 gallons) — 3x longer than standard.
AquaBliss High Output Revitalizing Shower Filter
Quickly neutralizes chlorine, heavy metals, pesticides, and scale, preventing dry itchy skin and damaged hair.
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Frequently asked questions
Which city has better tap water quality: Dixon or San Jose?
Dixon currently has the higher WaterQ score (100/100). Check each city page for system-level details and recent violations.
How are Dixon and San Jose water scores calculated?
WaterQ scores are based on EPA-reported drinking water data, including contaminant detections, violations, and compliance records across local systems.
Where can I view full reports for Dixon and San Jose?
Use the city detail pages to see water systems, score breakdowns, and trend context for Dixon, CA and San Jose, CA.