Rialto is a city in San Bernardino County, California, United States, 56 miles east of Los Angeles, near the Cajon Pass, Interstate 15, Interstate 10, State Route 210 and Metrolink routes.

[6][9] Its population and economic activity have grown rapidly in recent years due to the building of major distribution centers in the region.

Rialto is home to major regional distribution centers: Staples Inc., which serves stores across the entire West Coast of the United States, Amazon, Under Armour, Medline Industries, Niagara Bottling, Monster Energy and Target in the northern region of the city, in the Las Colinas community.

One of the United States' largest fireworks companies, Pyro Spectaculars, is also headquartered in Rialto.

Ancient artifacts discovered by archaeologists suggest that what is now the city of Rialto was settled prior to 1500.

This claim was later amended by the United States Government, permitting them a smaller fraction of the initial purchase.

[10] Along the line, townsites were located every 2,600 yards (2,400 m) [mile and a half] and by the fall of that year over 25 new towns were being built.

[10] A Methodist colony developed which was named after the Rialto Bridge in Venice, Italy, considered a central meeting place for Venetians.

[17] Records show that up until 1920, the Brooke School District was in continuous operation, except for a very short time in 1888.

The staff consisted of two teachers and a principal with separate play areas for the boys and girls.

[10] The U.S. Army Rialto Ammunition Storage point which was used during World War II to support operations in the Pacific theater.

[20] The 160-acre site (65 ha) was operated between 1941-1945 and the land later sold to defense contractors and private corporations.

[23] The United States Environmental Protection Agency designed a groundwater pump and treatment system to remove and clean contaminated water, and negotiated settlements to several lawsuits.

[21][24] Cleanup costs reached $100 million in 2014, and a pumping station was estimated to begin treating contaminated water between 2020 and 2021.

[21][25] According to the United States Census Bureau, the city has a total area of 22.4 square miles (58 km2).

Rialto experiences a Mediterranean climate with hot, dry summers and relatively mild winters.

[31] According to American Community Survey, German, Irish, English and Italian were the most common ancestries.

According to the 2010 U.S. Census, Rialto had a median household income of $49,428, with 19.2% of the population living below the federal poverty line.

[35] Rialto was the first city in the United States to require that all police officers wear body cameras.

[41] As a result, two city council members, Ed Scott and Winfred Lee Hansen, were up for recall.