San Francisco Water Quality: What's Really in Your Shower Water (CA 2026 Report)
Khat C
Last updated: March 2026
If you live in San Francisco, CA, your tap water contains 27 detected contaminants. Every time you shower, your skin and hair absorb these chemicals. Here's what's in your water.
What's in San Francisco's Water? 27 Contaminants Detected
Water systems serving San Francisco, CA have detected 27 contaminants across 1 water system.
Contaminants Exceeding Health Guidelines
| Contaminant | Detected | Health Guideline | Over Limit | Risk |
|---|---|---|---|---|
| Haloacetic acids (HAA9) | 0.0395 ppb | 0.0001 ppb | 658x | Under review |
| Haloacetic acids (HAA5) | 0.0344 ppb | 0.0001 ppb | 344x | cancer |
| Total trihalomethanes (TTHMs) | 0.0332 ppb | 0.0001 ppb | 222x | cancer |
| Trichloroacetic acid | 0.0096 ppb | 0.0001 ppb | 96x | cancer |
| Dichloroacetic acid | 0.0171 ppb | 0.0002 ppb | 86x | cancer |
| Chloroform | 0.0304 ppb | 0.0004 ppb | 76x | cancer |
| Bromodichloromethane | 0.0023 ppb | 0.0001 ppb | 39x | cancer |
| Nitrate | 3.2805 ppm | 0.1400 ppm | 23x | cancer |
How San Francisco's Water Affects Your Skin and Hair
- Dry, itchy skin: Chlorine strips natural oils β learn more
- Hair damage: Hard water minerals cause breakage and thinning
- Acne: Chemical residues clog pores and trigger breakouts
How to Protect Yourself
The Afina Filtered Showerhead ($99) uses multi-stage filtration to remove chlorine, heavy metals, and VOCs. Or add the Afina Shower Filter ($47) to your existing shower head β installs in under 5 minutes.
πΏ Protect Your Skin and Hair from San Francisco's Water
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FAQ
Is San Francisco tap water safe to shower in?
San Francisco's water meets legal standards, but 8 contaminants exceed EWG health guidelines. A shower filter adds protection.
What contaminants are in San Francisco's water?
27 contaminants detected, including Haloacetic acids (HAA9), Haloacetic acids (HAA5), Total trihalomethanes (TTHMs).
How often should I replace my shower filter?
Every 3-4 months or 10,000 gallons.