You can buy mineral spirits in California, but only reformulated low-VOC versions. Traditional mineral spirits are close to 100% volatile organic compounds by weight, and California caps non-aerosol paint thinners and multi-purpose solvents at 3% VOC by weight. That gap is too wide to close with a small tweak, so what sits on California shelves is a fundamentally different product from what’s sold in most other states.
What You’ll Actually Find in Stores
Walk into a California hardware store and you won’t see traditional mineral spirits on the shelf. What you’ll find are products labeled “low-VOC mineral spirits,” “odorless mineral spirits,” “mineral spirits substitute,” or simply “California compliant.” They’re stocked at paint supply shops, home improvement chains, and online retailers that ship to the state.
The labeling is usually straightforward. A few things to look for:
- A VOC content declaration on the label, often reading “less than 3% VOC by weight.”
- California compliance language such as “Formulated to meet California VOC limits” or “CARB compliant.”
- In the greater Los Angeles area, a check that the can does not say “Not for sale in SCAQMD.”
Some manufacturers split their product lines. Crown, for example, markets a “VOC Compliant Mineral Spirits Substitute” specifically for cleaning and states it is not intended for use as a thinner, recommending a separate product for thinning tasks.
Why the Traditional Product Isn’t Sold Here
Mineral spirits are a petroleum-based solvent used to thin oil-based paints, clean brushes and spray equipment, and degrease surfaces. The chemicals that make traditional formulations effective at dissolving paint also evaporate readily at room temperature. Once airborne, those VOCs react with nitrogen oxides in sunlight to produce ground-level ozone, the main ingredient in smog. California’s geography compounds the problem, since the Los Angeles basin and Central Valley trap air masses for days and let ozone build.
The California Air Resources Board sets VOC content limits for consumer products under Title 17 of the California Code of Regulations, Section 94509. The regulation prohibits anyone from selling, supplying, or manufacturing for sale in California any consumer product that exceeds the VOC limits in its Table of Standards.1Cornell Law School. Cal. Code Regs. Tit. 17, 94509 – Standards for Consumer Products
For non-aerosol paint thinners and multi-purpose solvents, the statewide limit is 3% VOC by weight, a standard that took effect at the end of 2013. Aerosol versions face a 10% VOC limit that took effect on January 1, 2016.1Cornell Law School. Cal. Code Regs. Tit. 17, 94509 – Standards for Consumer Products
To put that in context, traditional mineral spirits are almost entirely composed of VOCs. A 3% cap means roughly 97% of the solvent’s original active ingredients had to be removed or replaced. That is a near-complete reinvention of the product, not a minor reformulation.
The South Coast Layer for LA-Area Buyers
If you live in or around Los Angeles, Orange County, or the western portions of Riverside and San Bernardino counties, you’re in the South Coast Air Quality Management District. Under SCAQMD Rule 1143, the district has enforced a 25 g/L VOC limit for consumer paint thinners and multi-purpose solvents since 2011, and CARB’s regulation mirrors the 3% by weight standard within the district.1Cornell Law School. Cal. Code Regs. Tit. 17, 94509 – Standards for Consumer Products Some products that comply with the statewide rule still carry labels reading “Not for sale in SCAQMD.” Check that language on the can if you’re shopping in the region.
Buying Traditional Mineral Spirits Out of State
The CARB regulation targets selling and manufacturing for sale within California. It does not criminalize personal possession. If you drove to Nevada, bought traditional mineral spirits, and brought them back for a garage project, you would not be violating the consumer products regulation. Hauling flammable solvents across state lines creates its own safety and transportation issues, though, and compliant products are widely available inside California.
How Compliant Mineral Spirits Perform Differently
Low-VOC mineral spirits get the job done, but they don’t behave exactly like traditional formulations. Removing the most volatile aromatic compounds, particularly toluene and xylene, reduces both solvent strength and evaporation rate.
Odorless mineral spirits evaporate noticeably slower than the traditional version. For brush cleanup that barely matters. For thinning oil-based finishes the slower evaporation can help by extending working time, though it also means longer drying periods between coats, especially in cool or humid conditions.
The bigger practical issue is reduced solvency. Low-VOC mineral spirits are weaker solvents and may struggle to dissolve certain thicker resins or heavily dried paint. For routine brush cleaning and light thinning the difference is minor. For stripping stubborn finishes or degreasing heavy equipment, you may need to apply the product more aggressively or reach for a purpose-built degreaser rated for the task.
Disposing of Used Mineral Spirits
You cannot pour used mineral spirits down a drain or throw them in the trash. California law classifies solvents as household hazardous waste, and the Department of Toxic Substances Control directs residents to bring them to a household hazardous waste facility.2Department of Toxic Substances Control. Household Hazardous Waste
Most California counties and larger cities operate permanent household hazardous waste collection sites or hold periodic collection events, typically at no charge for residents. Check your local waste management agency’s website for drop-off locations and hours. Some facilities accept walk-ins; others require appointments.
Under federal law, used mineral spirits typically qualify as characteristic hazardous waste due to ignitability, carrying EPA Hazardous Waste Number D001.3eCFR. 40 CFR Part 261 – Identification and Listing of Hazardous Waste That classification applies even to low-VOC formulations if the flash point stays below 140°F.
One practical way to stretch a can: if you use mineral spirits for brush cleaning, let the dirty solvent sit in a sealed jar for a few days. The paint solids settle to the bottom, and you can carefully pour off the cleaner liquid on top and reuse it. You’ll still need to dispose of the sediment eventually, but you’ll go through far less product in the meantime.