This is a plain-words summary of public rules. It is not legal advice, and rules change. Use it to know what to ask, then confirm with your city before you buy or install anything.
The short version
- California allows residential softeners under conditions. The state sets equipment rules that apply everywhere. A softener that is regenerated at a separate facility, as an exchange tank is, falls under a different part of the law.
- Cities and sewer agencies can add rules. Some require a permit. Some bar new installs of the self-regenerating kind.
- The rules are about brine, not about soft water. They target salt brine going down your drain. Exchange tanks and salt-free systems are not what they aim at.
What the state requires of every softener
California Health and Safety Code sections 116775 to 116795 cover residential water softeners. A residential softener may be installed only if its regeneration happens at a nonresidential facility separate from the home, or if it discharges to the sewer and meets all of these:
- It regenerates only when needed. Demand-initiated regeneration. A softener that regenerates on a clock timer cannot be installed in California.
- It carries a certified salt-efficiency rating. The rating is set by a third party and has to meet the state minimum.
- Water-saving devices go in at the same time. Flow restrictors on faucets and showerheads, dams in toilet tanks, and piping that keeps outdoor hose bibs on unsoftened water.
The installer owes paperwork too. A contractor holding a C-55 (water conditioning) or C-36 (plumbing) license certifies the installation, and the certification is filed with the local plumbing-permit agency. It lists the homeowner, the make and model, the pounds of salt per regeneration, the salt-efficiency rating, the water-saving devices and the contractor's license number.
Section 116786 lets a local agency bar softeners that discharge to the community sewer, but only after specific findings. An ordinance under that section applies going forward and cannot require removal of units installed before it took effect. A separate law, Water Code section 13148, gives agencies in four regions, including the South Coast region that covers Orange County, more room to restrict softeners. It says it does not limit portable exchange appliances.
City by city
How to read the status column:
- Verified. We read the rule's own text, or the agency's own statement of it.
- Conditional. Allowed if the conditions are met.
- Conflict. Official sources disagree and we have not resolved it.
- Not verified. We did not find the rule or could not read it. That is not the same as no rule.
| City or agency | The rule in plain words | Status | Source |
|---|---|---|---|
| Corona | A city permit is required for an on-site-regenerating softener. The code also covers anyone offering or installing one for an owner or occupant who does not hold the permit. The penalty includes removal of the unit. | Verified | Corona Municipal Code 13.08.140 |
| Riverside | Allowed with a building permit if the unit meets the state conditions and a C-55 or C-36 contractor files an installation certificate with Building and Safety. The city may limit or bar softeners that discharge to the sewer only after findings about its wastewater permit. We found no such findings, which is not proof there are none. | Conditional | Riverside Municipal Code 14.12.245 and the city's softener guidelines |
| San Bernardino (sewer customers of the San Bernardino Municipal Water Department) | No residential softener unless it is regenerated off-site, or it discharges to the home's waste system with demand-initiated regeneration, a certified salt-efficiency rating, water-saving devices and a C-55 or C-36 certification filed with the city's Building Division. The director may limit or bar them after three findings. We found none. Highland, Colton, Rialto and Loma Linda have their own sewer providers, and we did not read their rules. | Conditional | Rule and Regulation No. 26, section 3.8 |
| Chino, Chino Hills, Fontana, Montclair, Ontario, Rancho Cucamonga, Upland (Inland Empire Utilities Agency) | The agency says its ordinance bars new installation and replacement of self-regenerating softeners. Units already installed can stay. It names exchange-tank services and non-salt systems as the alternatives. Cucamonga Valley Water District restates the rule. We read the agency's page, not the ordinance text. | Verified (agency page) | IEUA rebate program page and Cucamonga Valley Water District |
| Redlands | It is unlawful to install, replace or enlarge an ion-exchange softener that regenerates on site. Existing units may keep running if they are registered and certified. | Verified | Redlands Municipal Code 13.52.030 |
| Moreno Valley, Perris, Menifee, parts of Temecula and Murrieta (Eastern Municipal Water District) | The district's ordinance lets its general manager limit or bar softener regeneration discharges to the sewer, or regulate residential softeners under the state code. We did not find that it has been used, and we did not find the cities' own codes. | Not verified | EMWD wastewater ordinance, section 3.6 |
| Anaheim and the Orange County Sanitation District | Anaheim says it has no prohibition on salt-based systems. The district's discharge ordinance, searched in full, has no provision on softeners. | Verified | City of Anaheim, Water Hardness and OCSD-53 |
| Santa Ana, Fullerton, Huntington Beach, Garden Grove, Orange (Orange County Sanitation District area) | No softener restriction found in our search. We did not read every city code, Garden Grove's and Orange's could not be checked, and parts of Orange sit inside the Irvine Ranch Water District area. | Not verified | OCSD-53 |
| Irvine and the Irvine Ranch Water District area (parts of Lake Forest, Tustin, Orange, Costa Mesa and Newport Beach) | Irvine's code makes it unlawful to install or replace a self-regenerating softener whose operation may send salt waste into the district's system, except where state law permits. The district's own pages disagree with each other: one says it prohibits them, another says it discourages them and points to exchange-tank service and salt-free systems. Lake Forest is split between this district and El Toro Water District. | Conflict | Irvine Code of Ordinances 5-9-405 and IRWD water quality page |
| Other South Orange County districts (Santa Margarita, Moulton Niguel, South Coast, El Toro, Trabuco Canyon, San Clemente, San Juan Capistrano, Laguna Beach) | No restriction found. That is an absence of evidence, not an all-clear: we did not read each sewer ordinance line by line, and the rule that counts is the sewer agency's. | Not verified | None found to cite |
| Other Inland Empire areas (Jurupa Valley, Eastvale, Norco, Colton, Rialto, Bloomington, Highland, Loma Linda, Yucaipa, Beaumont, Banning) | We did not find a rule, and we do not say there is none. Ask your sewer provider. | Not verified | None found to cite |
Which agency counts
The rule that governs a softener is usually the sewer agency's, because the brine goes into its system. That is often not the agency that sells you water. Lake Forest and Orange are split, so do not go by city name. Ask your city's building or public works department which agency treats the sewage from your address.
Exchange tanks and salt-free systems
- Exchange tanks. A service delivers tanks of softening resin and swaps them on a schedule. The tanks are regenerated at a separate facility, so no brine leaves your home. State law allows this, and both the Irvine Ranch Water District and the Inland Empire Utilities Agency point homeowners to it.
- Salt-free systems. No salt, no brine, no discharge. Both agencies name them as an alternative. A salt-free conditioner does not remove hardness minerals. It changes how they form scale, so spots on glass and soap film on shower doors stay. See salt-free water conditioners and water softeners and conditioners.
What to do about it
- Find your sewer agency. Ask your city which agency treats the sewage from your address.
- Ask the city or agency one question. "Can I install a salt-based, self-regenerating water softener at my address, and what permit do I need?" Ask for the answer in writing.
- Ask Nuvia what fits at your address. The free water analysis shows your own tap's numbers, and the conversation starts from the rules that apply where you live.
- Keep the paperwork. If a softener goes in, the permit and the contractor's installation certificate should be in your file.
If you are weighing a do-it-yourself system, read online DIY or professional installation first.
Sources
- California Health and Safety Code, sections 116775 to 116795 (residential water softeners)
- California Water Code, section 13148 (water softening appliances)
- Corona Municipal Code, section 13.08.140 (water softening appliances)
- Riverside Municipal Code, Title 14, Chapter 14.12 (Municode)
- City of Riverside, Residential Water Softener Guidelines
- San Bernardino Municipal Water Department, Rule and Regulation No. 26 (section 3.8)
- Inland Empire Utilities Agency, water softener rebate program and ordinance
- Cucamonga Valley Water District, water softeners
- Redlands Municipal Code, section 13.52.030
- Eastern Municipal Water District, wastewater ordinance (section 3.6)
- City of Anaheim, Water Hardness
- Orange County Sanitation District Ordinance OCSD-53 (wastewater discharge)
- Irvine Code of Ordinances, section 5-9-405 (Municode)
- Irvine Ranch Water District, water quality information on softeners
Questions people ask
Can I install a salt-based water softener in my city?
It depends on your address. State law allows one if it meets the equipment rules, and some cities and sewer agencies bar new installs or require a permit. The table on this page shows what we found for each city. Confirm with your city or sewer agency before you buy.
Does California ban water softeners?
No. State law allows residential softeners that meet its equipment rules, and it allows a softener that is regenerated off-site. Some local agencies restrict the salt-based, self-regenerating kind. In the Inland Empire Utilities Agency cities and in Redlands, units already installed can stay.
What does California require of a softener that sends brine to the sewer?
It has to regenerate only when needed, not on a timer. It has to carry a third-party certified salt-efficiency rating. Water-saving devices have to go in at the same time. A contractor with a C-55 or C-36 license certifies the installation, and that certification is filed with the local plumbing-permit agency.
Which rule counts, my water district's or my sewer agency's?
The sewer agency's, in most cases, and it is often not the agency on your water bill. Lake Forest and Orange each sit partly inside the Irvine Ranch Water District area, so the city name alone does not tell you which rules apply. Ask your city which agency treats your sewage.
What are my options where salt-based softeners are restricted?
An exchange-tank service, where the resin is regenerated at a separate facility, or a salt-free system. State law allows exchange tanks, and both the Irvine Ranch Water District and the Inland Empire Utilities Agency point homeowners to them. A salt-free conditioner does not remove hardness minerals, so it solves a different problem than a softener does.
Is this page legal advice?
No. It is a plain-words summary of public rules, and rules change. Your city's building or public works department is the place to confirm what applies at your address.
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