Treat a wastewater result indicating a violation as a compliance event: preserve the report, record when you learned of it, and contact the control authority promptly. Federal industrial-user rules generally require notice within 24 hours and repeat-analysis results within 30 days of awareness, with specified resampling exceptions. Confirm permit requirements and corrective work.
What are the federal notification clocks?
Under 40 CFR 403.12(g)(2), an industrial user's sampling that indicates a violation requires notification to the control authority within 24 hours of becoming aware of it. The user also repeats sampling and analysis and submits the repeat-analysis results within 30 days after awareness. That is a results-submission deadline, not merely a date to book the laboratory.
The rule contains resampling exceptions when the authority samples at least monthly or samples between the original collection and receipt of its results. It also addresses sampling done by the authority in place of the user. Confirm the applicable exception with the authority; an older inspection or a contractor's opinion is not enough. Read the facility permit for additional duties.
What should you report and investigate?
Use the actual laboratory result, with its pollutant, units, sampling point, collection period and applicable permit limit. Record the awareness time, contact method, recipient and instructions received. Ask whether the event also requires an immediate potential-problem or spill notice; a harmful discharge has a different urgency from routine report preparation.
Investigate without rewriting the original data. Possible questions include whether the sampled stream was correct, whether production or cleaning changed, and whether pretreatment equipment operated as intended. A sampling question must be resolved with the laboratory and authority; it is not permission to discard an unfavorable result.
How do you organize repeat sampling and repairs?
Assign a person to each task:
- Confirm the authority's reporting and repeat-sampling instructions.
- Arrange the required sampling method and laboratory turnaround.
- Assess the process or pretreatment condition with the responsible qualified provider.
- Track repair completion separately from the new laboratory result.
- Submit the required result and preserve receipt in the monitoring record.
Phoenix's program distinguishes federal categorical limits from city local limits. Compare with the requirements for this facility and discharge, not a neighboring city's table. A passing later sample does not erase the earlier event, and finishing a pipe repair does not by itself establish that every discharge condition has been resolved.