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Run: Disinfection CT Calculation and Compliance Log

Track disinfectant residual, contact time, and CT compliance in one log to verify daily disinfection performance and document required Giardia and virus inac...

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Inspection Details

Inspection date and time recorded critical (required)

Facility, plant, or system identifier recorded critical (required)

Inspector name and role recorded critical (required)

Applicable disinfection SOP or operating target referenced

Disinfectant Residual and Water Quality Inputs

Disinfectant type selected critical (required)

Measured disinfectant residual critical (required)

Residual measurement point identified critical (required)

Record where the residual was measured, such as clearwell effluent, contact basin outlet, or distribution sample point.

Water temperature recorded critical (required)

pH recorded

Contact Time and CT Calculation

Effective contact time recorded critical (required)

Record the effective contact time used for CT determination, not just total detention time.

Baffling or detention factor applied critical (required)

Enter the factor used to convert theoretical detention time to effective contact time.

CT value calculated critical (required)

CT = disinfectant residual × effective contact time.

Required CT target met critical (required)

Confirm the calculated CT meets the applicable daily target for the treatment objective.

Yes No N/A

Required log inactivation confirmed critical (required)

Select the log inactivation target(s) verified by the CT result.

Note (optional)

Operational Conditions and Verification

Flow rate recorded critical (required)

Clearwell or contact basin level recorded

Sampling and test instruments verified within calibration date critical (required)

Yes No N/A

Any process upset or abnormal condition observed

Examples include low residual, short-circuiting, pump failure, alarm condition, or bypass event.

Yes No N/A

Corrective Actions and Sign-Off

Corrective action documented for any CT deficiency

Document the action taken or planned if the CT target was not met or if a process deviation occurred.

Supervisor or operator review completed critical (required)

Yes No N/A

Inspector signature critical (required)

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