There is no accurate one-sentence rule for every property called “San Diego.” California does not impose a blanket statewide ban on residential salt-based water softeners. State law creates a process that can allow qualifying local agencies to regulate self-regenerating softeners. The current answer still depends on the property’s jurisdiction and wastewater service area.
For property inside the City of San Diego, a major local detail changed in 2026. City Ordinance O-22104 repealed the former San Diego Municipal Code section 64.0514. The ordinance was finally passed on June 15, 2026, and states that it takes effect on the thirtieth day after final passage.
This page is a source-based summary, not legal advice. Confirm the current rule and permit requirements with the authority for the specific property before buying or installing equipment.
What California Water Code section 13148 does
California Water Code section 13148 applies to residential self-regenerating water softeners in specified circumstances. It gives certain local agencies authority to adopt an ordinance or resolution after the findings and procedures described in the statute.
The important distinction is:
- State law creates local regulatory authority.
- State law is not itself a statewide prohibition.
- A local agency must follow the statutory process for its own rule.
- The applicable rule can differ by jurisdiction and service area.
A self-regenerating softener is the familiar ion-exchange unit that periodically regenerates its resin and sends a brine stream to the drain.
What changed in the City of San Diego in 2026
City Ordinance O-22104 repealed San Diego Municipal Code section 64.0514. The former section addressed discharges from self-regenerating water softeners in the East Mission Gorge Force Main, Los Peñasquitos Sewer System service area.
The repeal is important because older articles may still describe the former City section as current. An old article, contractor page, or search result is not enough to establish today’s rule.
The repeal also does not prove that no other requirement applies. A property may be outside City jurisdiction, served by another wastewater agency, subject to plumbing rules, or affected by later changes.
Does the City require a plumbing permit?
The City’s current plumbing permit page lists water-softener installation among projects that may be eligible for a simple no-plan plumbing permit, subject to the page’s requirements and exceptions.
Before installation, confirm:
- Whether the property is inside City jurisdiction.
- Which wastewater agency serves the property.
- Whether the exact project qualifies for the simple no-plan process.
- Who will obtain the permit.
- Where the regeneration discharge may connect.
- Whether an HOA, landlord, or other property rule also applies.
Salt-based softener or salt-free conditioner
Regulation is only one part of the comparison.
An ion-exchange softener removes calcium and magnesium hardness minerals. It produces technically soft water and requires regeneration. Its efficiency, salt use, water use, and discharge depend on the exact equipment and settings.
A salt-free conditioner does not remove calcium or magnesium. It is a scale-control category, not true softening. Its performance should be evaluated using evidence for the exact model and the property’s water conditions.
Do not let an unsupported “salt softeners are banned” statement force the equipment decision. Also do not assume a repeal eliminates every permit or discharge requirement. Verify the rule first, then compare the treatment outcome, product evidence, maintenance, and total cost.
What to request in writing
Ask the professional to identify:
- The property’s permitting and wastewater jurisdiction.
- The exact manufacturer and model.
- Whether the equipment truly softens water or only seeks to control scale.
- Rated capacity and efficiency.
- Regeneration and discharge requirements.
- Installed price, maintenance, and replacement cost.
- Permit responsibility and written warranty.
Filter Pros San Diego is an independent information and referral site. We do not give legal advice or perform the installation. If you request a local match or call (858) 400-6508, the independent professional must confirm the current rule, equipment, price, schedule, and warranty directly with you.