Chapter 20.04 REQUIRED PROTECTION

Chapter 20.04
REQUIRED PROTECTION

Sections:

20.04.010 Where protection is required.

A. Each service connection from the city water system for supplying water to premises having an auxiliary water supply shall be protected against backflow of water from the premises into the public water system unless the auxiliary water supply is accepted as an additional source by the city, and is approved by the public health agency having jurisdiction.

B. Each service connection from the city water system for supplying water to any premises on which any substance is handled in such fashion as may allow its entry into the water system shall be protected against backflow from the premises into the public system. This shall include the handling of process waters and waters originating from the city water system which have been subjected to deterioration in sanitary quality.

C. Backflow prevention devices shall be installed on the service connection to any premises having (1) internal cross-connections that cannot be permanently corrected and controlled to the satisfaction of the state or local health department and the city, or (2) intricate plumbing and piping arrangements or where entry to all portions of the premises is not readily accessible for inspection purposes, making it impracticable or impossible to ascertain whether or not cross-connections exist. (Ord. 88-11 § 1 (part))

20.04.020 Type of protection required.

The type of protection that shall be provided to prevent backflow into the approved water supply shall be commensurate with the degree of hazard that exists on the consumer’s premises. The type of protective device that may required (listing in an increasing level of protection) includes (1) double check valve assembly (DC), (2) reduced pressure principle backflow prevention device (RP), and (3) an air-gap separation (AG). The water user may choose a higher level of protection than required by the city. The minimum types of backflow protection required to protect the approved water supply, at the user’s water connection to premises with varying degrees of hazard are given in Table 1. Situations which are not covered in Table 1 shall be evaluated on a case-by-case basis and the appropriate backflow protection shall be determined by the city engineer.

TABLE 1

TYPE OF BACKFLOW PROTECTION
REQUIRED

A. Sewage and Hazardous Substances

1. Premises where the public water system is used to supplement the reclaimed water supply. (Minimum type of backflow - AG)

2. Premises where there are wastewater pumping and/or treatment plants and there is no interconnection with the potable water system. This does not include a single-family residence that has a sewage lift pump. An RP may be provided in lieu of an AG if approved by the health agency and the city. (Minimum type of backflow - AG)

3. Premises where reclaimed water is used and there is no interconnection with the potable water system. An RP may be provided in lieu of an AG if approved by the health agency and the city. (Minimum type of backflow - AG)

4. Premises where hazardous substances are handled in any manner in which the substances may enter a potable water system. This does not include a single-family residence that has a sewage lift pump. An RP may be provided in lieu of an AG if approved by the health agency and the city. (Minimum type of backflow - AG)

B. Auxiliary Water Supplies.

1. Premises where there is an unapproved auxiliary water supply which is interconnected with the public water system. An RP may be provided in lieu of an AG if approved by the health agency and the city. (Minimum type of backflow - RP)

2. Premises where there is an unapproved auxiliary water supply and there are no interconnections with the public water system. A DC may be provided in lieu of an RP if approved by the health agency and city. (Minimum type of backflow - DC)

C. Fire Protection Systems.

1. Premises where the fire system is directly supplied from the public water system and there is an unapproved auxiliary water supply on or to the premises (not interconnected). (Minimum type of backflow - DC)

2. Premises where the fire system is supplied for the public water system and interconnected with an unapproved auxiliary water supply. An RP may be provided in lieu of an AG if approved by the health agency and city. (Minimum type of backflow - RP)

3. Premises where the fire system is supplied from the public water system and where either elevated storage tanks or fire pumps which take suction from the private reservoirs or tanks are used. (Minimum type of backflow - DC)

D. Premises where entry is restricted so that inspections for cross-connections cannot be made with sufficient frequency or at sufficiently short notice to assure that cross-connections do not exist. (Minimum type of backflow - RP)

E. Premises where there is a repeated history of cross-connections being established. (Minimum type of backflow - RP)

F. Business, facilities, or premises designated below shall require backflow protection as indicated as a minimum.

1. Aircraft and missile plants -- RP.

2. Automotive plants -- RP.

3. Autopsy facilities -- RP.

4. Beverage bottling plants -- RP.

5. Breweries -- RP.

6. Buildings.

a. Hotels, apartment houses, public and private buildings, or other structures, where sewage pumps and/or sewage erectors have been installed -- RP;

b. Any commercial structure in which the specific business activity cannot be ascertained -- RP;

c. Multistoried buildings that use booster pumps or elevated storage tanks to distribute potable water within the premises --DC;

d. Any building that exceeds forty (40) feet in height as measured from the service connection to the highest water outlet --DC.

7. Canneries, packing houses and reduction plants -- RP.

8. Chemical Plants -- Any premises, served from a public water supply, where there is a facility requiring the use of water in the industrial process of manufacturing, storing, compounding or processing chemicals. This will also include facilities where chemicals are used as additives to the water supply or in the processing of products -- RP.

9. Chemically Contaminated Water System. Any premises, served from a public water supply, where chemicals are used as additives to the water supply, or where the water supply is used for transmission or distribution of chemicals, or where chemicals are used with water in the compounding or processing of products --RP.

10. Cold storage plants -- RP.

11. Convalescent homes -- RP.

12. Dairy processing plants -- RP.

13. Dental clinics -- RP.

14. Dry cleaning facilities -- RP.

15. Dye works -- RP.

16. Film processing facilities or film manufacturing plants -- RP.

17. Hospitals -- RP.

18. Ice manufacturing plants -- RP.

19. Irrigation system.

(a) Premises or locations where facilities have been installed for pumping, injecting or spreading fertilizers, pesticides or other hazardous substances -- RP;

(b) Premises or location having a separate service connection for irrigation purposes -- RP.

20. Laboratories, including, but not limited to, teaching institutions, biological and analytical facilities -- RP.

21. Laundries (commercial) -- RP.

22. Medical buildings and clinics -- RP.

23. Metal manufacturing, cleaning, processing or fabricating plants -- RP.

24. Morgues -- RP.

25. Mortuaries -- RP.

26. Multi-Storied Buildings. See Buildings.

27. Multiple Services. Includes two or more interconnected services provided by one or more water purveyors to a single consumer complex. Minimum backflow protection required: DC, at each service connection.

28. Nursing homes -- RP.

29. Oil/gas production, storage or transmission premises --RP.

30. Paper and paper products manufacturing plants -- RP.

31. Plastic manufacturing, extruding and injection molding --RP. See Chemical Plants.

32. Plating plants -- RP.

33. Portable spray or cleaning equipment which can be connected to a public water system -- AG.

34. Radioactive materials or substances -- plants or facilities that process, handle or store radioactive materials or substances -- RP.

35. Reclaimed Water Distribution System.

a. Premises where the public water system is used to supplement the reclaimed water system -- AG;

b. Premises where reclaimed water system is used and there is no interconnection with the potable water system -- RP.

36. Restricted, classified, or other closed facilities -- RP.

37. Rubber manufacturing plants -- natural or synthetic --RP.

38. Sand and gravel plants -- RP.

39. Sanitariums -- RP.

40. Schools, colleges and universities -- RP, if actual or potential health hazard exists on the premises.

41. Solar Heating Systems.

a. Solar collector system which contains any hazardous substance and where there is a direct make-up connection to the public water system -- RP;

b. Services connection protection is not required for “once through” solar heating systems including, but not limited to, domestic hot water systems.

42. Tank trucks -- AG. See portable spray and cleaning equipment.

43. Vehicle washing facilities -- RP.

44. Veterinary clinics -- RP.

45. Waterfront facilities and industries, including, not limited to, docks, fisheries, fish hatcheries and marinas -- RP. (Ord. 93-05 § 3: Ord. 88-11 § 1 (part))