Los Serranos is a neighborhood within the city of Chino Hills in southwestern San Bernardino County, California. It is named after the Los Serranos Golf Course within the east-central portion of the Chino Hills city limits, near the Chino Valley Freeway (SR 71). The U.S. Census reported Los Serranos as a separate place in the 1990 Census until the low income region was incorporated by the city of Chino Hills on December 1, 1991. Los Serranos Golf Course failed in the stock crash of the late 20s leaving a subdivision divided into narrow golf course bungalows behind. The average lot width is 30 feet. The ZIP code serving the neighborhood is 91709. Name Los Serranos loosely means "the hill-dwellers" in Spanish. Various translations include "highlanders," "mountaineers," or "men of the hills." The area is also the homeland of the Serrano tribe of Native Americans, given that name by Spanish missionaries. The Greening family owned the golf course and put in the sewer system as part of the original water works well before most of the properties were developed. Greening also owned Dam Number 808 which routinely flooded areas below it until former State Senator Ruben Ayala put in a flood control channel at the personal expense of landowners affected by Greening's flooding. Apparently Greening was not required to contribute, even though the flood control channel was a requirement for the dam licensing of 1936 or so. Christine Arias is the mayor of the Los Serranos sub division. Area Los Serranos is a substandard lot size subdivision within the city of Chino Hills. It is further divided by locals into two sections known locally as "Upper" and "Lower" Los Serranos. The line of demarcation between the two areas is Ramona Avenue. The eastern part is "Lower" Los Serranos because it was subjected to flooding until very recently, whereas Western areas of Los Serranos are known as "Upper" Los Serranos due to general lack of flooding. Houses along the rim of the Los Serrannos Golf Course have narrow lots and are not well maintained, and suffer from errant golf balls. Lower Los Serranos is defined by Joyce and George Butler who run Support Our Area Residents (S.O.A.R.), a non registered public charity from their home. They have been awarded the status of Community Heroes of 2007 by the Pomona Fairground and City of Chino Hills and the local newspaper, Chino Champion publications.