In an effort to tackle California’s persistent housing shortage and accelerate infrastructure development, California has enacted the most substantial reform to the California Environmental Quality Act (CEQA) in decades and marks a dramatic shift in how housing and certain infrastructure projects will be reviewed, permitted, and challenged under California environmental law.

At the heart of these changes—the result of AB 130 and SB 131 that Governor Gavin Newsom signed into law earlier this summer—is a sweeping new CEQA exemption for urban infill housing projects. This term is defined in the legislation by proximity to “urban uses,” yet the legislation defines “urban uses” in a circular and ambiguous manner. If this new statutory language on “urban uses” is broadly interpreted it could unlock significant streamlined housing development in many urban and suburban areas across California, particularly in Southern California, where much of the potentially developable land may qualify. However, this legislation’s broad language and key undefined terms raise legal and policy questions in its implementation, and if interpreted too broadly by jurisdictions and courts, could result in further legislative action to clarify and limit its scope.

The New CEQA Exemption for Infill Housing Projects

Under the reforms, a newly codified statutory CEQA exemption (Public Resources Code § 21080.66) applies to a wide array of “housing development projects”—a term that includes residential-only developments, mixed-use projects with significant residential components, and supportive or farmworker housing, including any permits and public improvements required for the project.

To qualify, a project must meet several baseline conditions for CEQA, including:

• It must be located in an incorporated city or urbanized area, as defined by the U.S. Census;
• The project site must be considered “urban infill.” This includes sites that meet at least one of several criteria: previously developed with an “urban use”; surrounded by urban development on 75% of its perimeter; or within an area where 75% of the land within a quarter-mile is developed with urban uses;
• The site size must not exceed 20 acres (or 5 acres for builder’s remedy projects);
• The project will be at least one-half of the applicable “Mullin” density (i.e, at least five units per acre for an unincorporated area in a nonmetropolitan county, 10 units per acre in a suburban jurisdiction, and 15 units per acre in a metropolitan jurisdiction);
• The project must be consistent with local zoning, the general plan, and any local coastal program, where applicable;
• It must avoid environmentally sensitive lands or hazardous locations (e.g., wetlands, floodplains, or very high fire severity zones) and historic structures, and may not include transient lodging such as hotels or short-term rentals.

The new legislation also imposes site assessment and remediation requirements for environmental hazards and mandates compliance with a shortened tribal consultation process. Unlike many recent legislative efforts to reduce barriers to housing production, AB 130 does not require prevailing wages or union labor unless the project is 100% affordable housing (requires prevailing wage) or exceeds 85 feet in height (prevailing wage and a “skilled and trained workforce”).

“Urban Use”: A Broad Term Defined Ambiguously

One of the most important yet legally uncertain features of the new exemption is its reliance on the term “urban use,” which appears multiple times as a criterion for whether a project site qualifies as infill.

Crucially, “urban use” defined in an almost circular fashion as “any current or previous residential or commercial development, public institution, or public park that is surrounded by other urban uses, parking lot or structure, transit or transportation passenger facility, or retail use, or any combination of those uses.” (Public Resources Code § 21080.44. (a) As such, the term “urban use” could be interpreted quite broadly. For example, sites that were previously developed for commercial, industrial, or low-density residential use could all potentially qualify—even if the surrounding area is currently undeveloped or contains only a single residential lot, uses not typically seen as “urban.” Further, in many other locations, the criteria related to being surrounded by urban development on 75% of its perimeter; or within an area where 75% of the land within a quarter-mile is developed with urban uses, could end up including large portions of rural property by extending the “urban use” farther from already developed properties.

This ambiguity could significantly expand the reach of the exemption. In Southern California, it appears that many parcels—even those on the periphery of urban areas—could arguably meet the “urban use” threshold. As a result, a large number of proposed projects may now qualify for full CEQA exemption, even in areas where environmental review was previously required.

The Legislature is reportedly considering a trailer bill to clarify or narrow the meaning of “urban use,” but until then, cities, counties, and developers are operating in a gray area that may invite legal challenges or inconsistent interpretations.

Smaller Projects Will Benefit Most

The new exemption’s 20-acre cap (5 acres for builder’s remedy projects) is further well-suited to coastal Southern California’s development landscape, where infill housing projects are often necessarily small in scale.

However, key limitations still apply. The exemption does not override local zoning or general plans. Projects must still be consistent with the California Coastal Act and local coastal programs—a significant factor in areas along the coast, where additional environmental and planning regulations apply.

Not Just Housing: New Exemptions for Infrastructure and Services

Beyond the urban infill housing exemption, SB 131 includes a suite of narrower CEQA exemptions for community-serving and infrastructure projects, such as:

• Day care centers, unless on protected lands.
• Light rail facilities.
• Federally qualified health centers and rural clinics under 50,000 square feet.
• Advanced manufacturing facilities, located on industrially zoned land.
• Wildfire risk reduction projects, climate adaptation plans, and park or trail facilities funded by the 2024 Prop 4 bond.

Some of these new exemptions are clearly defined, but others, such as the one for advanced manufacturing, could again be open to broad interpretation. Depending on how local jurisdictions apply this term, certain general industrial or even logistics projects could potentially qualify.

Conclusion: Speed with Uncertainty

The CEQA reforms in AB 130 and SB 131 mark a major pivot in California’s housing and land use policy. By exempting qualifying projects entirely from CEQA, the state has taken a bold step toward reducing the barriers that have long stifled housing production.

For Southern California, where many potential housing projects are already aligned with the exemption’s criteria, the potential benefits are substantial. However, vague statutory language, especially around the definition of “urban use,” creates legal and administrative uncertainty. Until the Legislature provides clarity through trailer bills or the state issues interpretive guidance, local governments and developers will be left to navigate these reforms with caution, perhaps facing legal challenges.

Procopio’s Real Estate, Land Use, and Environmental Law attorneys are well-versed in these latest amendments to CEQA, and in navigating existing and new development requirements throughout Southern California. Reach out and let’s discuss how we can help you and your projects.