Someone forwarded you an article about California cracking down on water softeners, or a neighbor mentioned a new rule at a homeowners meeting, and now you’re staring at the softener tank in your garage wondering if it’s even legal. Here’s the short version: there’s no county-wide ban on salt-based softeners in San Diego today. There is a real state law that gives local water agencies room to restrict them, and understanding what it actually says will save you from either panicking or ignoring a rule that might apply to your neighborhood.
What AB 1366 actually did
In 2009, California passed Assembly Bill 1366, which added Section 13148 to the state Water Code. The law doesn’t ban anything on its own. Instead, it hands a tool to local agencies that own or operate a community sewer system or a water recycling facility, letting them regulate or even prohibit residential self-regenerating water softeners within their service area.
“Self-regenerating” is the legal term for a standard salt-based softener, the kind that flushes brine down the drain every few days to recharge its resin. That brine, up to about a pound of salt per unit per day, ends up in the sewer system.
Section 13148 applies only in specific hydrologic regions defined by the California Water Plan: the Central Coast, the South Coast, the San Joaquin River region, Tulare Lake, and a handful of Central Valley counties. San Diego County sits inside the South Coast region, so it’s covered by the law’s reach. That’s a critical distinction from an outright statewide ban, though. Coverage under AB 1366 means a local agency could act. It doesn’t mean one has.
Before a local agency can do anything, a regional water quality control board has to find that limiting residential salt input would genuinely help meet water quality goals in that area. Only then can the agency hold a public hearing and pass an ordinance or resolution. The options on the table include requiring high-efficiency, NSF-certified units, requiring a plumbing permit before installation, mandating hot-water-only hookups, running a voluntary buy-back or exchange program, or in the most aggressive version, requiring removal of existing units with compensation paid to the owner.
Why water agencies care about brine in the first place
Every gallon of brine a softener sends down the drain raises the salinity of the wastewater that reaches a treatment plant. That matters more in San Diego than it used to. The region has invested heavily in Pure Water San Diego, the program that purifies recycled wastewater into drinking water. High salt content makes that purification process harder and more expensive, and it can push treated water past limits set for irrigation and groundwater recharge. A single household softener isn’t the problem. Tens of thousands of them across a service area add up fast, and that’s the math local agencies are reacting to when they consider using AB 1366.
Is San Diego actually restricting softeners right now?
As of today, no city or water district in San Diego County has adopted a county-wide ban on salt-based softeners. Salt-based systems are still legal, still sold, and still installed across the region every week. Some California communities in the Central Coast and San Joaquin Valley regions have used AB 1366 to restrict or phase out self-regenerating units, which is where a lot of the “California banned water softeners” headlines originated. San Diego hasn’t followed that path.
That said, this is local-agency-by-local-agency law, and rules can shift with a single city council vote or a new ordinance from a water district. If you live in a smaller municipal water service area rather than under the City of San Diego or San Diego County Water Authority umbrella, it’s worth a five-minute call to your provider to confirm there’s nothing on the books that affects softener installation, brine line requirements, or future removal mandates.
What this means if you’re shopping for a softener today
You don’t need to rush out and rip out an existing salt-based system. What’s worth doing is checking with your own water or sewer provider before you install a new one, especially if you’re on a smaller municipal system rather than the City of San Diego’s main network. A quick call to their customer service line will tell you whether any local ordinance touches self-regenerating softeners in your service area.
It’s also worth considering salt-free water conditioning as an alternative, not because the law requires it in San Diego, but because it sidesteps the brine question entirely. Salt-free systems prevent scale buildup without discharging anything into the sewer. As San Diego keeps expanding its water recycling infrastructure, that’s a system that won’t need a second look if local rules ever do shift.
Frequently asked questions
Are water softeners banned in California? No. There’s no statewide ban. AB 1366 lets certain local agencies within specific hydrologic regions, including the South Coast region that covers San Diego, restrict or prohibit salt-based softeners if a regional water board finds it necessary. Whether that applies depends entirely on your local water or sewer provider.
Is San Diego considering a ban on salt-based softeners? No county-wide ban is currently in place or publicly proposed for San Diego. Some other California communities have used AB 1366 to restrict softeners, but San Diego’s major water agencies haven’t taken that step.
What is Water Code Section 13148? It’s the section added by AB 1366 in 2009. It authorizes local agencies that run community sewer systems or water recycling facilities to control residential softener brine discharge through ordinance, after a regional water board finding and a public hearing.
Can I still legally buy and install a salt-based softener in San Diego? Yes. Salt-based softeners remain legal to buy and install in San Diego as of today. Just confirm with your specific water provider if you’re outside the main City of San Diego system, since smaller districts set their own rules.
What’s the real difference between salt-based and salt-free treatment? Salt-based softeners remove hardness minerals through ion exchange and discharge brine as part of the process. Salt-free conditioners alter the mineral structure so it can’t stick to pipes and fixtures, without adding sodium to your water or the sewer system. Our salt-free water conditioning guide breaks down the tradeoffs in more detail.
Get a straight answer for your address
Rules like AB 1366 are easy to misread from a headline. If you want to know exactly where your property stands, and whether a salt-free water conditioning system makes more sense than a traditional softener, our free in-home water test covers both your water hardness and your local district’s requirements. If you’re also weighing a permit question, our guide to water softener permit requirements in San Diego County is the natural next read, or see how we stack up against the big brands in Culligan vs. Filter Pros San Diego. Call us at (858) 400-6508 and we’ll walk you through what applies to your specific address.