§ 13.08.060. Backflow prevention methods required

A. Whenever the following items exist or activities are conducted on premises served by the public potable water system, a potential hazard to the public potable water supply shall be presumed, and a backflow prevention method of the type specified herein for that item or activity must be utilized or installed at each service connection for that premises. The type and size of the assembly shall be determined by the department. The basis for these requirements are contained in the Manual of Backflow Prevention and Cross-Connection Control Program as is further set forth in Section 13.08.160 of this chapter.

1. Cooling tower, boiler, condenser, chiller and other cooling systems utilizing potable water: RPA;

2. Tank, vessel, receptacle and all other water connections including mobile units without approved air gap (except emergency vehicle and private swimming pools): RPA;

3. Ice maker (other than a residential service): RPA;

4. Water cooled equipment, boosters, pumps or autoclaves: RPA;

5. Water treatment facilities and all water processing equipment (other than residential water softeners): RPA;

6. Bottle washer, bedpan washer, garbage can washer: RPA;

7. Pesticide, herbicide, fertilizer and chemical applicators (other than typical in-home use): RPA;

8. Aspirator: RPA;

9. Commercial dishwashers, food processing and/or preparation equipment, carbonation equipment, or other food service processes utilizing potable water: RPA;

10. Decorative fountain, baptismal, or any location water is exposed to atmosphere: RPA;

11. X-ray equipment, plating equipment, or any other photographic processing equipment utilizing potable water: RPA;

12. Auxiliary water supply and/or connections to unapproved water supply systems: RPA;

13. Reclaimed water customers: RPA;

14. Recreational vehicle dump stations (sewer), or any other location where potable water may be exposed to bacteria, virus or gas: RPA;

15. Any premises on which chemicals, oils, solvents, pesticides, disinfectants, cleaning agents, acids or other pollutants and/or contaminants are handled in a manner by which they may come in direct contact with potable water, or there is evidence of the potential to contact potable water (other than typical, infrequent in-home applications): RPA;

16. Materials and piping systems unapproved by the Uniform Plumbing Code (UPC) or Environmental Protection Agency for potable water usage (for fire systems see the following listings: 20, 21 and 22): Contaminant: RPA — Pollutant: CDVA;

17. Separately metered or unprotected irrigation systems, and construction water services: RPA or PVB as allowed;

18. Any premises where a cross-connection is maintained or where internal backflow protection is required pursuant to the Uniform Plumbing Code: RPA;

19. Multimetered properties with more than one meter connected to another or any building three stories or greater than thirty-four (34) feet in height from service level: DCVA;

20. Fire systems—American Water Works Association Classes 1 and 2 systems constructed of a piping material not approved for potable water pursuant to the Uniform Plumbing Code as adopted by the town: DCVA or double detector CVA;

21. Fire systems—American Water Works Association Classes 3, 4, 5 and 6: DCVA or RPA as allowed. Backflow assemblies with detectors may be required by the department for certain installations;

22. Fire systems which require backflow protection and where backflow protection is required on the industrial/domestic service connection that is located on the same premises, both service connections will have adequate backflow protection for the highest degree of hazard affecting either system: RPA (requirement may be waived by the department).

B. When two or more of the activities listed above are conducted on the same premises and served by the same service connection or multiple service connections, the most restrictive backflow prevention method required for any of the activities conducted on the premises shall be required to be utilized or installed at each service connection. The order of most restrictive to least restrictive backflow prevention methods shall be as follows:

1. Air gap (most restrictive);

2. Reduced pressure principle assembly (RPA);

3. Double check valve assembly (DCVA);

4. Pressure vacuum breaker assembly (PVB) (least restrictive).

(Ord. 97 §1 (part), 1994: prior code §12-7-5)