| Business | Phone |
| All American Backflow Riverside 92504 | (951) 789-1250 |
| All American Backflow Prvntn Riverside 92508 | (951) 789-1465 |
| Aqua Backflow & Chlorination 1473 W Linden St, Riverside 92507 | (951) 222-2229 |
| Ramsey Backflow & Plumbing 16434 Sun Summit Dr, Riverside 92503 | (909) 381-2923 |
| Ramsey's Backflow & Plumbing 5744 Norwood Ave, Riverside 92505 | (951) 674-4804 |