Water Quality Report
San Diego, CA
Contaminants Detected
Based on the most recent testing data from your local water utility. Compared against health guidelines set by independent researchers.
Understanding this report
Health guidelines vs. legal limits: The EPA sets legal limits (MCLs) for contaminants — but these are based on feasibility and cost, not just health. Independent health organizations set stricter guidelines based on the latest science. A contaminant can be “legal” but still exceed health-based guidelines.
“Times above guideline”: This shows how many times higher the detected level is compared to the health guideline. For example, “281x” means the detected level is 281 times higher than what health researchers recommend.
What you can do: A whole-home or point-of-use water filtration system can significantly reduce or eliminate most contaminants. The right system depends on your specific water — a professional water test at your tap is the best way to determine what you need.
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Why test your water at home?
- ✓Utility data is an average — your tap may differ based on your pipes and plumbing
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Frequently asked questions about San Diego, CA water
Is the tap water in San Diego, CA safe to drink?
The tap water in San Diego, CA meets EPA legal standards, but 7 contaminants exceed health guidelines set by independent researchers. While legally compliant, long-term exposure to elevated contaminant levels may pose health risks.
What contaminants are in San Diego, CA water?
Common contaminants found in San Diego, CA water include disinfection byproducts (like trihalomethanes and haloacetic acids), which are created when chlorine reacts with organic matter during water treatment. Other potential contaminants include heavy metals, nitrates, and PFAS chemicals. See the full report above for specific levels.
How can I improve my water quality in San Diego, CA?
The most effective way to improve your water quality is with a whole-home or under-sink water filtration system designed to target the specific contaminants in your water. A professional in-home water test is the best first step — it identifies exactly what's in your water so you can choose the right solution.
Where does San Diego, CA get its drinking water?
Drinking water in San Diego, CA comes from the local public water system, which may source water from surface water (rivers, lakes, reservoirs) or groundwater (wells, aquifers). The specific source affects which contaminants may be present. Contact your local water utility for details about your specific water source.