Pasadena’s tap water averaged about 14 grains per gallon of hardness in 2024 — well past the 10-grain line where water is classified “very hard.” That is the white crust on your faucets, the spots on your glasses and the scale building up inside your water heater. We have been treating hard water for Pasadena homes and businesses for over 20 years from our shop in Burbank, a short drive down the 134.
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How hard is Pasadena water, exactly?
Pasadena Water and Power publishes the numbers every year in its Annual Drinking Water Quality Report. Here is the most recent data:
| Measure | Pasadena (2024) | What it means |
|---|---|---|
| Average hardness | About 236 ppm (≈14 grains per gallon) | Very hard |
| Range across the year | 208 – 270 ppm (12 – 16 gpg) | Very hard |
| Calcium | 64 ppm average | The mineral that becomes scale |
| Total dissolved solids | 410 ppm average | Affects taste and spotting |
Pasadena is about 40% past the point where water is classified “very hard.” At this level scale builds quickly wherever water is heated — water heaters, tankless units, dishwashers and coffee makers.
Source: Pasadena Water and Power, 2025 Annual Drinking Water Quality Report (2024 data). PWP reports average hardness of “approximately 236 ppm or 14 grains per gallon.”
About two-thirds of Pasadena’s 2024 water was imported through the Metropolitan Water District; the rest was pumped from the local Raymond Groundwater Basin. The blend shifts through the year, so hardness moves between roughly 12 and 16 grains depending on the season. The good news in the same report: Pasadena Water and Power states it has had no PFAS detections in its treated drinking water. Hardness, taste and disinfectant are the everyday issues — and all three are fixable.
What hard water is costing Pasadena homes
Hard water is not a health risk. It is an equipment, cleaning and comfort problem that adds up quietly:
- Water heaters and tankless units. Scale insulates the burner or element from the water, so the heater works harder and fails sooner. Tankless heaters are especially sensitive to scale.
- Older plumbing. Many Pasadena Craftsman and bungalow homes still have older galvanized lines, where mineral buildup narrows pipes and lowers water pressure over time.
- Fixtures and appliances. Dishwashers, washing machines, ice makers and espresso machines fail at the scale line first, and most warranties exclude scale damage.
- Cleaning. Hard water blocks soap from lathering, so you use more detergent and still get spotting on glass and streaks on tile.
- Skin, hair and laundry. Soap residue stays on skin and in fabric — towels stiffen and whites go grey.
Your options in Pasadena
There is no single right system. It depends on your hardness reading, your plumbing, whether you own or rent, and whether you want truly soft water or just scale protection. We will tell you honestly which one you need — including when it is the less expensive one.
Salt-based water softener — the complete fix
Ion exchange removes the calcium and magnesium, which is the only way to get genuinely soft water: easy lather, no spotting, no new scale. At Pasadena’s hardness this is what most homeowners are looking for. Our metered valves regenerate based on actual water use instead of a timer, saving salt and water.
Salt-free conditioning (TAC) — scale protection, no salt
Template Assisted Crystallization keeps hardness minerals from bonding to pipes and heaters. It will not make water feel soft, but it needs no salt, no drain line and almost no maintenance — a good fit for condos, HOA buildings and tight installs.
Whole-house filtration
A softener handles hardness; a whole-house carbon filter handles the disinfectant taste and odor, sediment and other everyday complaints. Most Pasadena homes we work on get both, which is why we build a combined softener and filter package.
Reverse osmosis for drinking water
An under-sink reverse osmosis system gives you clean, great-tasting drinking and cooking water straight from the tap, and ends the bottled water runs. Our packages can add instant hot water, a chiller and an elegant dual faucet in the same cabinet.
Straightforward pricing: drinking water systems start from $1,500 and whole-house water softening from $3,800, including professional installation, standard materials and the full manufacturer warranty.
Commercial systems
Restaurants and cafes in Old Pasadena and the Playhouse District, salons, medical and dental offices all face the same scale problem at a higher cost — dishwashers, steamers, ice machines and espresso machines are the first to suffer. See our commercial water treatment.
Areas we serve in Pasadena
Old Pasadena, the Playhouse District, Bungalow Heaven, Madison Heights, South Arroyo, Linda Vista, San Rafael, Lower Arroyo, Hastings Ranch, Lamanda Park, East Pasadena and all Pasadena ZIP codes: 91101, 91103, 91104, 91105, 91106 and 91107. We also cover Altadena, South Pasadena, San Marino, La Cañada Flintridge, Glendale, Burbank and the wider Los Angeles area.
How it works
- Free water test. We test the water at your own tap and show you the reading. No charge, no obligation.
- A straight recommendation. We tell you which system fits your home and budget — and when you do not need the bigger one.
- Professional installation. Usually a single visit, with a proper bypass and drain, and a walkthrough before we leave.
- We stay. Warranty on parts and labor, filter and salt service, and a local team that answers the phone.
We test your tap, show you the numbers and give you a firm price — no obligation.
Frequently asked questions
How hard is the water in Pasadena, CA?
Pasadena Water and Power reported an average hardness of about 236 ppm for 2024, which is roughly 14 grains per gallon, with readings from 208 to 270 ppm (about 12 to 16 grains per gallon). Anything above 10 grains per gallon is classified as very hard, so Pasadena sits firmly in that category.
Why does Pasadena’s hardness change during the year?
About two-thirds of Pasadena’s 2024 supply was imported through the Metropolitan Water District and the rest came from the local Raymond Groundwater Basin. The mix shifts with the seasons and with how much imported water comes from the Colorado River versus Northern California, so the same tap can test differently from one month to the next.
Is my home served by Pasadena Water and Power?
Most of the city is, but parts of East Pasadena, Altadena and nearby unincorporated areas are served by other water companies with different water. That is exactly why we test the water at your own tap before recommending anything.
How much does a water softener cost in Pasadena?
Our packages include professional installation, standard materials and the full manufacturer warranty. Whole-house water softening starts from $3,800 and drinking water systems start from $1,500. We confirm your exact price on site after the free water test, before any work begins.
How long does installation take?
Most Pasadena homes are finished in a single visit, typically two to four hours depending on where the main line and drain are. Older Craftsman and bungalow homes sometimes need a little more planning for the tie-in, which we check during the water test.
Do I need a water softener or a filter?
They solve different problems. A softener removes the calcium and magnesium that cause scale; a whole-house filter removes chlorine, chloramine, taste and odor. At Pasadena’s hardness most homeowners benefit from both, which is why we offer a combined softener and filter package.
Can I get a softener in a condo or HOA building?
Often yes. Where space, drain access or HOA rules rule out a salt-based system, a salt-free TAC conditioner protects pipes and appliances from scale without a brine tank or drain line. We look at the install location during the free water test.
Do you serve Pasadena businesses?
Yes. We install and service commercial softening, filtration and reverse osmosis for restaurants, cafes, offices, salons and medical and dental practices, and we rent bottleless water coolers. See our commercial systems.