Tests to order in CA
- Hydrogen sulfide
- Sulfate
- Iron bacteria
- Coliform bacteria
California well water problem / Rotten Egg Smell in Well Water
Rotten Egg Smell in Well Water in California
Water smells like rotten eggs, sulfur, or sewage. For California private wells, the safest path is to match the symptom with lab testing before choosing treatment.
Likely causes
- Hydrogen sulfide gas
- Sulfate-reducing bacteria
- Water heater anode reaction
What to do next
- Check if smell is hot-water-only
- Test bacteria before treatment
- Discuss aeration or oxidizing filtration
Related California well water topics
Orange or Rust Stains from Well Water
Sinks, tubs, toilets, or laundry develop orange-brown stains.
Black Stains in Well Water
Black staining appears on fixtures, laundry, or toilet tanks.
Blue-Green Stains from Well Water
Blue or green stains appear around drains and fixtures.
Salty Tasting Well Water
Water tastes salty, brackish, or mineral-heavy.
Metallic Taste in Well Water
Water tastes metallic, bitter, or like pennies.
Cloudy or Milky Well Water
Water looks cloudy, white, or milky in a glass.
Keep your well history
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Save test history, set annual reminders, compare results over time, and create a shareable report for your family or water professional.
Track symptoms and lab results in the app