3 CNG stations in Ontario, CA.
Ontario has 3 public CNG stations listed. 1 of them also carries at least one other alternative fuel.
Nearby cities in California with CNG: Fontana (3 stations, about 7 mi), Riverside (3 stations, about 12 mi) and Santa Ana (3 stations, about 27 mi).
Clean Energy - Ontario International Airport
3350 John Bangs Dr, Ontario, CA
CNG
Ontario CNG - 76
1850 E Holt Blvd, Ontario, CA
E85, CNG, Renewable Diesel, and Hydrogen
United Parcel Service
1735 S Turner Ave, Ontario, CA