Ontario, California · Inland Empire

Commercial cleaning in
Ontario.

Janitorial programs and specialized facility services for Ontario businesses — scheduled around your operation, scoped in writing before work starts.

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Also serving
Rancho Cucamonga
Upland
Fontana
Chino
Montclair

Ontario is the logistics core of the Inland Empire — distribution centers, cold storage, light manufacturing and the commercial buildings that support them, clustered around the airport and the I-10/I-15 interchange. That building stock is mostly concrete, mostly high-traffic, and mostly running more than one shift.

Nexara is based in the Inland Empire, which means a walkthrough in Ontario is a short drive rather than a scheduling problem — and so is showing up when something needs attention between scheduled visits.

Who actually occupies Ontario's commercial buildings?

Ontario's largest employers, per the city's FY2025 financial report, lean logistics and public-sector: UPS (5,000–9,999 employees), then Atlantic Solutions Group, the Ontario-Montclair school district, Workforce Personnel, DAL Global Services and the City of Ontario, each in the 1,000–4,999 range. That mix is warehouses, staffing-agency-supplied distribution floors, and school and government administrative buildings.

Ontario principal employers, FY2025 (City of Ontario ACFR)

United Parcel Service
Employee range
5,000–9,999
Sector
Parcel/logistics
Atlantic Solutions Group Inc.
Employee range
1,000–4,999
Sector
Staffing/warehouse labor
Ontario-Montclair School District
Employee range
1,000–4,999
Sector
K-8 education
Workforce Personnel, Inc.
Employee range
1,000–4,999
Sector
Staffing/warehouse labor
DAL Global Services, Inc.
Employee range
1,000–4,999
Sector
Airport ground/cargo services
City of Ontario
Employee range
1,000–4,999
Sector
Municipal government
Employee Force Provider, Inc.
Employee range
1,000–4,999
Sector
Staffing
Kaiser Foundation Hospitals
Employee range
1,000–4,999
Sector
Healthcare
Chaffey Joint Union High School District
Employee range
1,000–4,999
Sector
9-12 education
CRST Van Expedited, Inc.
Employee range
1,000–4,999
Sector
Trucking/logistics

Ontario principal employers, FY2025 (City of Ontario ACFR)
Employer	Employee range	Sector
United Parcel Service	5,000–9,999	Parcel/logistics
Atlantic Solutions Group Inc.	1,000–4,999	Staffing/warehouse labor
Ontario-Montclair School District	1,000–4,999	K-8 education
Workforce Personnel, Inc.	1,000–4,999	Staffing/warehouse labor
DAL Global Services, Inc.	1,000–4,999	Airport ground/cargo services
City of Ontario	1,000–4,999	Municipal government
Employee Force Provider, Inc.	1,000–4,999	Staffing
Kaiser Foundation Hospitals	1,000–4,999	Healthcare
Chaffey Joint Union High School District	1,000–4,999	9-12 education
CRST Van Expedited, Inc.	1,000–4,999	Trucking/logistics

The report gives ranges rather than exact counts because, per the state Employment Development Department, individual employer figures are confidential. The pattern still holds: Ontario's building stock is dominated by third-party logistics operators, staffing agencies placing warehouse labor, and the school and hospital systems that serve a growing residential base nearby.

How is growth near Ontario International Airport changing the building stock?

Ontario International Airport has leased 215 acres east of the terminal to developer CanAm Ontario for The HUB, a nine-warehouse logistics complex totaling 4.3 million square feet, with buildings ranging from 200,000 to 930,000 square feet. Phase I — four buildings with more than 2 million square feet — was completed in February 2026, with Phase II under construction, so new large-footprint concrete floors keep coming online near the airport.

Buildings that size don't run one cleaning schedule. Newly delivered warehouse space typically starts with a post-construction clean before tenant move-in, then shifts to a recurring program once racking and equipment traffic are in place — see post-construction cleaning for how that handoff is scoped, and floor care for the ongoing concrete maintenance that follows.

New warehouse delivery near ONT: post-construction cleanup, then a recurring concrete floor and dock program
Existing distribution buildings: high dusting for overhead racking and beams, floor scrubbing keyed to forklift traffic
Cargo and ground-services buildings near the terminal: interior janitorial scoped around round-the-clock operations

Which cleaning tasks matter most in Ontario's warehouses, airport buildings and schools?

Distribution and cold storage buildings need concrete floor care and dock-area attention; airport-adjacent cargo and ground-services buildings run cleaning around continuous operations rather than a fixed overnight window; and the school and municipal buildings tied to Ontario's largest employers need a written scope with a defined inspection standard, since they answer to a public body rather than a single facility manager.

Ontario building type → what the program emphasizes

Distribution/warehouse (I-10/I-15 interchange)
What the program emphasizes
Concrete floor scrubbing, dock apron pressure washing, high dusting of racking
Cold storage
What the program emphasizes
Condensation and residue control, scheduling around continuous operations
Airport-adjacent cargo/ground services
What the program emphasizes
Interior janitorial scoped around round-the-clock schedules, not a single shift
School and municipal administrative buildings
What the program emphasizes
Written scope, documented inspection standard, predictable frequency

Ontario building type → what the program emphasizes
Building type	What the program emphasizes
Distribution/warehouse (I-10/I-15 interchange)	Concrete floor scrubbing, dock apron pressure washing, high dusting of racking
Cold storage	Condensation and residue control, scheduling around continuous operations
Airport-adjacent cargo/ground services	Interior janitorial scoped around round-the-clock schedules, not a single shift
School and municipal administrative buildings	Written scope, documented inspection standard, predictable frequency

How fast is Ontario's commercial building stock likely to keep growing?

Ontario's population grew from 175,265 at the 2020 Census to an estimated 187,013 on July 1, 2025 (Census Bureau Vintage 2025) — a 6.7% increase, the fastest of the five cities Nexara serves. New rooftops on the city's south side bring new schools, retail centers and offices that need a cleaning program from day one, not after a complaint.

Much of that growth is in Ontario Ranch, a roughly 8,000-acre (about 13-square-mile) master-planned area in the southern part of the city, which is adding residential, retail, office and industrial space alongside the warehouse growth already happening near the airport. New construction on that scale means a steady pipeline of buildings needing their first cleaning program, not just an established base being re-serviced.

Which school districts operate buildings in Ontario?

Ontario-Montclair School District (K-8) and Chaffey Joint Union High School District (9-12) both appear among the city's largest employers, in the 1,000–4,999 range. For a cleaning program the practical constraint is the same in both: heavy work lands outside instructional hours, and anyone on campus meets the district's screening rules.

See K-12 and education for how a school cleaning program is scheduled around the academic calendar, athletics, and campus security requirements rather than a standard business-hours model.

Do Santa Ana winds and dust affect commercial cleaning in Ontario?

They can. South Coast AQMD Rule 403 requires best available dust control on any active operation that can generate fugitive dust, with extra notice duties for sites of 50 or more disturbed acres, but dust still moves on windy days. Buildings near grading or open lots often need entry and glass attention after a wind event, not just a seasonal clean.

A building near an active grading site or an open lot on Ontario's growing south side collects more windblown dust at entries and on exterior glass after a Santa Ana event. See window cleaning and pressure washing for the exterior side of that response, and high dusting for what settles on interior racking and ductwork in warehouse space.

What stormwater rules apply to pressure washing in Ontario?

Ontario is a co-permittee under the San Bernardino County MS4 permit (Order No. R8-2010-0036), which requires its cities to prohibit or control wash water from pressure cleaning and from cleaning parking lots, sidewalks and plazas. Pressure washing has to contain and recover that runoff, not just move dirt toward the gutter.

That applies to loading docks, entry walkways, parking structures and exterior building washing alike. Pressure washing scoped for Ontario's commercial buildings accounts for containment and runoff control as part of the job, not as an afterthought.

Questions

Ontario facility questions.

Do you serve facilities near Ontario International Airport?

Yes. Nexara is based in Ontario, CA, so airport-adjacent cargo facilities, ground-services buildings and the new warehouse space near ONT are inside the home service area, not a special trip. Programs for these buildings are scoped around round-the-clock or multi-shift operations rather than a single overnight window.

Can you clean a warehouse before it opens for the first time?

Yes — that's post-construction cleanup, and it's a separate service from the recurring janitorial program that follows. A newly delivered building needs debris removal, dust knockdown and a detail clean before racking and tenants move in; see post-construction cleaning for how that scope is defined.

How often do warehouse floors near Ontario's distribution corridor need attention?

It depends on traffic and floor type — a forklift aisle in continuous use needs more frequent scrubbing than a lightly used storage bay. The scope defines frequency by area rather than applying one schedule to the whole building; see floor care for how that's broken out.

Do you clean school district buildings in Ontario?

Yes, within the scope Nexara defines for education clients — see K-12 and education. Scheduling works entirely around the academic calendar and campus security requirements, and the written scope names the inspection standard the district can hold the program to.

Does Santa Ana wind season change how often entries need cleaning?

Windblown dust from Santa Ana events settles heavily at entries, on exterior glass and on ground-floor hard surfaces near open lots or active grading. Buildings in those conditions typically need more frequent attention right after a wind event rather than waiting for the next scheduled visit — window cleaning and pressure washing cover the exterior response.

Can pressure washing wastewater just run into the street in Ontario?

No. Ontario is a co-permittee under the Santa Ana Regional Water Quality Control Board's San Bernardino County MS4 permit, which requires cities to prohibit or control pressure-cleaning wash water reaching a storm drain. Pressure washing has to contain runoff — see pressure washing for how that's handled on dock aprons, walkways and building exteriors.

Do you work around cold storage and refrigerated distribution buildings?

Cold storage floors and dock areas carry more condensation and residue than dry warehouse space, which changes what a cleaning program emphasizes rather than how often it happens. Scope is built around the specific building's operation — see floor care and manufacturing and warehouse.

Is Ontario Ranch's new commercial space covered?

Yes. Ontario Ranch, the master-planned area in southern Ontario, is inside Nexara's home service area along with the rest of the city. New retail, office and industrial buildings there need a cleaning program defined from occupancy, the same as any established building.

Sources

Reviewed by Nexara Facility Services · Updated September 23, 2026

Services in Ontario

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Near Ontario.

Rancho Cucamonga
Upland
Fontana
Chino
Montclair

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Serving Ontario and the surrounding Inland Empire.

Every scope starts with a walkthrough. We look at the building, ask what is actually going wrong today, and come back with a written scope and a number — not a brochure.