Water Softener in El Cajon, CA

Is my El Cajon address on Helix or Padre Dam water?

The city lists both districts as water providers: Helix Water District at 619-466-0585 and Padre Dam Municipal Water District at (619) 448-3111. Helix's own report names El Cajon among the cities it serves. We couldn't verify which neighborhoods fall to Padre Dam, so the water bill is the quickest answer, and either district can confirm an address. It matters because each publishes its own water quality report, and that report is where you start when sizing a softener.

How much hardness should the softener be built for?

For Helix customers, the district's report gives treated plant water at 155 to 250 mg/L as calcium carbonate, averaging 206, which works out to 12.0 grains per gallon. Water Helix buys already treated averages 146 mg/L, about 8.5 grains. We don't have a verified hardness figure for Padre Dam water, so those customers should read Padre Dam's current report. Either way, a test at the kitchen faucet is what the valve should be programmed to, because the blend reaching one street can differ from the average.

Helix disinfects with chloramines, averaging about 2.1 mg/L. A softener doesn't remove chloramine, and over years chloramine wears down ordinary resin. If taste or resin life is a concern, a carbon tank in front of the softener handles both.

What does a 1970s El Cajon house need for the install?

The median El Cajon home was built around 1974. Builders then seldom stubbed out a softener loop, so the plumber usually opens the main where it enters, adds inlet and outlet valves with a bypass, and runs a brine line to a drain with an air gap. The control valve needs an outlet within reach. In a valley that gets hot summers, a shaded garage wall or side yard beats a spot in full afternoon sun. Older main shutoffs and hose bib valves are worth replacing while the water is off, and outdoor spigots are usually split off ahead of the softener.

One local note

The City of El Cajon runs its own sewer collection system, so softener discharge goes to a household drain like any appliance. If the install grows into new piping, the plumber can check permit needs with the city's Building Safety Division at 200 Civic Center Way (619-441-1726), which takes submittals online through its PACO system. Have your water bill and the location of the main shutoff ready when you call.