Are Water Softeners Allowed in Los Angeles?

What does California law say about water softeners?

California law lets certain local agencies restrict water softeners, but only through a set process. Water Code § 13148, added by AB 1366 and in force since January 1, 2010, allows an agency that runs a community sewer system or water recycling plant to control salt from "residential self-regenerating water softeners." It can act only if its Regional Water Quality Control Board has made a finding about salinity, and only by ordinance or resolution after a public hearing.

The menu of options in the statute runs up to banning new installations and requiring removal of existing ones. An agency that orders removal must offer owners a compensation program for the reasonable value of the unit. The section applies in named hydrologic regions, including the South Coast, Central Coast, San Joaquin River and Tulare Lake regions. It "does not limit the use of portable exchange water softening appliances," the tanks a service company swaps and recharges off site.

Where are softeners banned in Los Angeles County?

In Los Angeles County, the ban on salt softeners covers the Santa Clarita Valley and, since October 2026, Newhall Ranch. The LA County Sanitation Districts say automatic, self-regenerating salt-based softeners "are prohibited throughout the Santa Clarita Valley," naming the City of Santa Clarita, Stephenson Ranch, Castaic and Valencia by FivePoint.

Installation has been prohibited in the Santa Clarita Valley since 2003. Measure S, approved by voters on November 4, 2008, required removal of residential automatic softeners that discharge chloride to the sewer by June 30, 2009. The Newhall Ranch Sanitation District adopted its own ordinance on September 1, 2026, effective October 1, 2026.

Why do sewer agencies care about softener salt?

Sewer agencies care because the salt a softener flushes out ends up in treated wastewater, and ordinary treatment plants do not remove it. EPA's WaterSense softener guide says regeneration creates "a salty brine that may pose problems for wastewater treatment and local water quality," and that some jurisdictions prohibit softeners for that reason.

In Santa Clarita the issue is chloride. Wastewater there goes to the Valencia and Saugus water reclamation plants, and LACSD's chloride program targets what reaches the sewer; it notes an advanced chloride treatment facility at the Valencia plant that has run since 2023. Switching to potassium chloride does not fix this: the Water Quality Association says it is not recommended for cutting chloride, because regeneration needs a 13-15% higher concentration of it.

Each regeneration also uses water: EPA puts a typical cycle at 20 to 70 gallons. That is why WaterSense pushes demand-initiated models that regenerate only after a set volume, rather than on a timer.

Are softeners allowed in the San Fernando Valley?

As of October 2026, no rule restricting water softeners in the San Fernando Valley was found. The pages read were from LACSD, LA Sanitation, LADWP, Burbank Water and Power, Glendale Water & Power and the City of San Fernando. LADWP's water quality FAQ discusses softeners as a homeowner's choice, and the City of San Fernando's 2025 report says "some households choose to install water softeners to reduce scaling."

"Not found" is not the same as "legal everywhere forever." Section 13148 lets a sewer agency adopt a ban after a hearing, so rules can change, and a homeowners association or a rental lease can add its own limits. Check with your city before installing. Whether a softener is worth it on your water is a separate question, covered on do you need a water softener in the Valley and Valley water hardness by supplier.

What are the salt-free alternatives?

The alternatives are any treatment that adds no sodium or potassium chloride to the sewer. LACSD's acceptable alternatives page, written for the Santa Clarita Valley, lists carbon filters, portable exchange tanks, reverse osmosis and template-assisted crystallization (TAC) units.

• Portable exchange tanks: a service company swaps them every 2 to 4 weeks, per LACSD, and recharges them off site. They do soften.
• Salt-free (TAC) conditioners: they reduce scale but leave the hardness minerals in the water. Details are on salt-free water conditioners.
• Reverse osmosis: an under-sink unit treats drinking water only; LACSD says sediment filters need changing every 6 months and the membrane every 3 to 5 years. See under-sink reverse osmosis.
• Carbon filters: they target chlorine and chloramine taste, not hardness.

For no-salt units, EPA WaterSense points buyers to Z601, the IAPMO/ANSI scale-reduction standard.

What should you check before installing one?

Before installing a salt softener, check local rules, your plumbing and the unit's efficiency. A short list:

1. Ask your city's sewer or public works office whether any softener ordinance is pending; EPA's guide says to check local restrictions before buying.
2. If the house is on a septic system, ask the septic maker or a local service provider whether regeneration brine will overload it, as EPA advises.
3. Pick a metered (demand-initiated) model, ideally one certified to NSF/ANSI 44 at better than 3,350 grains of hardness per pound of salt.
4. Plumb it before the water heater and after the branch to irrigation and hose bibbs.
5. Have a licensed plumber (C-36, checkable at cslb.ca.gov) make the connection if you are not doing the work yourself.

Both routes are sold by the two shops that share this site's owners: the SoftPro ECO city softener (sold by SoftPro Water Systems, which shares owners with this site) (from $967, the shop's listed price in October 2026) and a salt-free conditioner at Quality Water Treatment (sold by Quality Water Treatment, which shares owners with this site) ($1,299 listed). That unit is sold as a no-salt scale reducer. Whether its media counts as TAC under Santa Clarita's rules is something only the maker can confirm.