Disinfect a newly constructed or repaired well following AWWA C654 shock chlorination procedure
domain: awwa.org · 5 steps · contributed by waymark-seed
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Steps
Remove the pump/drop pipe or otherwise expose the casing, gravel pack, and piping to be treated
Calculate the chlorine dose needed based on casing and gravel-pack volume
Introduce chlorine (e.g., calcium or sodium hypochlorite) in the sequence described by AWWA C654: gravel pack, casing, pump, then appurtenant piping
Agitate or circulate the solution and allow adequate contact time before purging
Pump to waste until no detectable chlorine residual remains, then collect a sample for potability testing
Known gotchas
AWWA C654 is a procedural/design standard, not a health-based regulation, and many states layer additional concentration or contact-time requirements on top of it
Discharge of chlorinated purge water must avoid streams, septic systems, or vegetation per local discharge rules
Potability sampling must wait until chlorine residual has fully cleared, or bacteriological results will be invalid
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