This document is an American Water Works Association (AWWA) standard. It is not a .. This foreword is for information only and is not a part of AWWA C AWWA C Disinfecting Water Mains. Current; Document Language: English; Published By: American Water Works Association (AWWA). AWWA C and these specifications. Disinfection requirements shall include preventive and corrective measures during construction, forms of chlorine and.

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If planned maintenance, indicate type of planned maintenance e. Share facebook twitter Print. For all other types of cleaning e.

Operating authorities shall use Certified Operators for functions that must be performed by a Certified Operator. C6511 sampling will typically occur at the point of Flushing, and may take place from sampling ports, hydrants, blow-offs, or premise plumbing. The flow shall be directed to ensure that the sample represents water that has passed through the location of the repair.

AWWA C / AWWA C / AWWA C – Disinfection Of Water Package

For new watermains with limited sampling points available, an alternative method of collecting Microbiological samples is called staged sampling. The procedures are required to be followed in order to awwa conditions imposed by the Director in a c6511 water works permit.

The operating authority shall implement the plan as prescribed and the watermain cannot be put back in service until the cleaning, disinfection and sampling is completed as per the plan unless a Water Advisory is declared. The requirements in this section also apply to temporary watermains.

This definition does not include recharging the watermain or a requirement to achieve scouring velocity within the watermain. Examples of watermain breaks that are typical of Category 1 are included below for illustrative purposes only:.

If there is evident or suspected chemical Contamination of a watermain, in addition to the procedures in sections 3. The following flowchart is an example of the typical steps required for Category 2 aww breaks. Staged sampling shall be performed as follows: Flow may be reduced by throttling valves while maintaining sufficient flow from the break to minimize the potential for Contamination.


Flow may be discontinued after an Air gap has been created.

If chlorine disinfection was used, indicate initial concentration, contact time, final concentration and final concentration as percentage of initial concentration. If these disinfectant concentrations cannot be achieved, Flushing shall continue until the disinfectant concentration at the point of Flushing is representative of the system residual in the break area, determined by sampling upstream of the break area and downstream at the Flushing location, or by awa documented benchmarks for the area, as long as free chlorine concentrations are at least 0.

In developing these procedures, operating authorities may use best management practices that go beyond the minimum requirements in this document. Flushed water may be discharged from a hydrant, plumbing or Appurtenances.

Watermain disinfection procedure

Return to normal service is contingent upon the corrective actions and sampling plan being completed to the satisfaction of the local Ministry office in consultation with the local Medical Officer of Health. Cc651 watermain cleaning, the requirements of section 3. If Contamination is evident or suspected, the procedures defined under section 3 for Category 2 watermain breaks shall apply.

The disinfection requirements for new watermains as per Section 1. With respect to new watermains, relined watermains and temporary watermains, the provisions of this document, including sections 1.

After business hours, the operating authority shall send an e-mail to the e-mail address specified by local Ministry office no later than 10 AM the next business day; or in the Special Cases described in sections 3.

Flushing shall continue until the disinfectant concentration at the point of Flushing reaches at least 0. Appendix C Category 1 flowchart The following flowchart is an example of the typical steps required for Category 1 watermain breaks Note: X651 to the chlorine demand exerted by the copper, no minimum chlorine concentration is required following the 24 hour contact time, and the effectiveness of the disinfection process shall be demonstrated by the Microbiological sampling referred to in section 1.


The sequence of actions may be varied as appropriate for the specific situation. Pipe and Repair Parts disinfected?

Examples of typical steps for Category 1, 2 and for special cases are attached as Appendices C, D and E respectively. The operating authority shall finalize the plan in agreement with the local Ministry office in consultation with the local Medical Officer of Health.

Watermain repairs involving more than 6 metres of replaced pipe awaw also classified as Category 2.

For relining of existing watermains, the conditions of section 1. Contamination is typically not suspected for circumferential breaks or small leaks where flow is maintained from the break until an Air gap is established and where the Air gap is maintained during the repair procedure. Additional steps shall be undertaken as awa to remove Contaminants from the watermain, such as:.

Watermain disinfection procedure |

Skip to main content. Chain of custody Date and time of return to normal service Water Advisory declared: If an operating authority believes that contaminated water was directed to users, this will constitute an observation of improper disinfection in accordance with Section of Schedule 16 of O.

The watermain may be returned to normal service defined as having all valves aswa to normal operating position prior to receipt c615 sample results. The operating authority shall record the duration of disinfection, as well as the initial dose and remaining residual at the end of the contact time.

Refer to Appendices A and B for a flowchart and pictures to better understand the criteria to determine the categories of watermain breaks.