San Diego / Local water guide
San Diego: understand the water before choosing equipment.
San Diego’s 2025 report describes chloramine disinfection and overlapping Alvarado, Miramar and Otay service areas. It says the water met all state and federal drinking-water health standards. A neighborhood name does not establish a single treatment-plant reading for your tap.
An interconnected city supply
The annual report’s treatment areas overlap. Water source proportions and demand can change. The City’s general guidance describes typical hardness around 16 grains per gallon, but it is not a current reading at your address. Use your measured hardness and household demand to size a softener.
Chloramine, hardness and RO
Chloramine is used for disinfection in the distribution system. A carbon proposal needs media and contact time appropriate for the stated objective. It does not establish hardness removal. Salt-based ion exchange addresses hardness; a kitchen RO is a separate treatment point with its own performance and maintenance documents.
What a reading can—and cannot—tell you
A hardness test helps with softener selection. A TDS reading alone does not identify individual contaminants or prove safety. Ask for a model-specific performance sheet when treatment targets a specific constituent; use an appropriate laboratory test when needed.
Your address and assessment
For a home around Genesee Avenue, Clairemont, Bay Ho or University City, share the address and provider first. A rental or shared main line needs an access and permission check before any whole-home proposal.
Read the primary sources
Sources reviewed October 18, 2026. A publication date and the year of water-quality data can differ. Follow your utility’s current notices and confirm the latest report before purchase.
- Annual Drinking Water Quality Report 2025City of San Diego Public Utilities
- Water Quality — Water HardnessCity of San Diego
Three technologies. Different purposes.
| Technology | Primary purpose | What it does not establish | Plan for |
|---|---|---|---|
| Whole-home filtration | Selected sediment, taste and odor goals on the main line | Hardness removal or universal contaminant reduction | Cartridge/media changes, flow and pressure |
| Ion-exchange softening | Reduce calcium/magnesium hardness | Drinking-water purification | Salt, regeneration, drain, power and local requirements |
| Kitchen reverse osmosis | Dedicated drinking/cooking faucet with model-specific performance | Whole-house treatment | Cabinet space, filters, membrane and reject-water connection |
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