SECTION 610 - DISINFECTION OF POTABLE WATER SYSTEM
610.1 General.
New or repaired potable water systems shall be purged of deleterious matter and disinfected prior to utilization. The method to be followed shall be that prescribed by the health authority or water purveyor having jurisdiction or, in the absence of a prescribed method, the procedure described in either AWWA C651 or AWWA C652, or as described in this section. This requirement shall apply to “on-site” or “in-plant” fabrication of a system or to a modular portion of a system.
- The pipe system shall be flushed with clean, potable water until dirty water does not appear at the points of outlet.
- The system or part thereof shall be filled with a water/chlorine solution containing at least 50 parts per million (50 mg/L) of chlorine, and the system or part thereof shall be valved off and allowed to stand for 24 hours; or the system or part thereof shall be filled with a water/chlorine solution containing at least 200 parts per million (200 mg/L) of chlorine and allowed to stand for 3 hours.
- Following the required standing time, the system shall be flushed with clean potable water until the chlorine is purged from the system.
- The procedure shall be repeated where shown by a bacteriological examination that contamination remains present in the system.
Comment:
Bacteriological examination shall be performed by recognized testing laboratory. A test for coliform bacteria and residual chlorine shall be performed. Results of test shall be provided to the building inspector prior to issuance of a Certificate of Occupancy. Following is a list of some labs in our area:
Centre Analytical Laboratories, Inc.
3048 Research Drive, State College, PA 231-3082
Fairway Laboratories, Inc.
2019 9th Avenue, Altoona, PA 946-4306
Todd Giddings & Associates
3049 Enterprise Drive, State College, PA 238-5927
Roaring Spring Water Services
740 Spang Street, Roaring Springs, PA 238-1027