UCR Policies and Procedures

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Campus Policy Number: 425-95

Water Sanitation, Chlorination of Potable Water Lines

Policy Owner: Environmental Health & Safety
Effective Date: 1/15/94

    1. Safe Drinking Act, 40 CFR, sections 140-149.
    2. California Safe Drinking Water Act, California Health and Safety Code sections 4010.1 (b), and 4026 (a).
    3. State of California Safe Drinking Water and Toxic Enforcement Act of 1986, Health and Safety code.
    4. American Water Works association Standard for Disinfecting Water Mains.
    5. Public Utilities Department Water Division, Specification No. 205 for the Design and Installation of Water Distribution System. City of Riverside.
  3. It is the policy of the University of California to assure that the potable water is clean, pure, safe, and unadulterated.

    1. EH&S will approve the chlorination schedules and procedures prior to initiation of work.
    2.  Upon initiation of the chlorination project, EH&S will supervise the disinfection operation, take water samples for bacteriological and/or other necessary analysis and issue written approval of satisfactory disinfection performance.
    3. A hypochlorite solution, approved by EH&S, shall be used in conjunction with an acceptable injection system.
    4. If chlorine gas in an aqueous carrier is used, only an approved safe injection system will be permitted on the site.  This must be reviewed and approved by EH&S.
    5. The use of other disinfection agents, material or products and injection systems must receive prior approval from EH&S.
    6. At the time when chlorine is introduced into water lines the concentration shall be at least 100ppm.  The chlorinated water shall be retained in the water line for at least 24 hours.  After 24 hours the residual chlorine concentration should not be less than 50 ppm.
    7. After the completion of the test, system will be completely flushed until chemical test shows chlorine residual of less than 0.5 ppm or equivalent to campus supply.
    8. Chlorination operation will be approved if both coliform and hydrotropic bacterial counts are analyzed to be below the allowable limits.