Bacteriological Sampling Field Log - RTCR
Log routine, repeat, and triggered coliform sampling under the Revised Total Coliform Rule with site details, chlorine residuals, field conditions, and chain-of-custody in one record.
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Built for: Municipal Water Utilities · Public Works And Water Districts · Environmental Compliance · Contract Water Sampling Services
Overview
This template is a field log for bacteriological sampling events under the Revised Total Coliform Rule. It captures the details that make a sample usable and defensible: sampling event type, date and time, collector identity, site identifier, site description, access and representativeness, free and total chlorine residuals, bottle condition, contamination risk, custody transfer, cooler temperature, field observations, corrective actions, and final sign-off.
Use it when collecting routine, repeat, or triggered coliform samples from a distribution system, storage-related location, or other approved sampling point. It is especially useful when multiple people touch the process, when samples are transported to an outside laboratory, or when compliance records need to show exactly what happened in the field. The log helps connect the lab result to the conditions at the time of collection.
Do not use this as a substitute for a sampling plan, site approval list, or corrective action procedure. It will not tell you where to sample or whether a result triggers a regulatory response. It is the record of the event itself. If the sample point was inaccessible, the bottle was expired, the residual was not measured, or custody was unclear, the log should show that deficiency and the follow-up taken.
Standards & compliance context
- The template supports documentation practices used under the Revised Total Coliform Rule by preserving the field conditions tied to each bacteriological sample.
- Chain-of-custody fields help support defensible laboratory submission records and reduce disputes about sample integrity.
- Residual measurements and field observations align with common drinking water utility quality procedures and help explain unexpected results.
- If your primacy agency, utility SOP, or laboratory requires additional fields, add them without removing the core sampling and custody record.
General regulatory context for orientation only — verify current requirements with counsel or the relevant agency before relying on this template for compliance.
What's inside this template
Sampling Event Details
This section establishes what kind of sampling event occurred, when it happened, and who collected it so the record can be tied to the correct compliance action.
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Sampling event type identified
Select whether this is a routine, repeat, or triggered sample event.
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Sampling date and time recorded
Record the exact date and time the sample was collected.
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Sample collector identified
Enter the name or ID of the person who collected the sample.
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Sampling event notes
Record any event-specific notes, including reason for repeat or triggered sampling.
Sample Site and Location
This section identifies the exact approved sampling point and confirms it was accessible and representative at the time of collection.
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Sample site identifier recorded
Enter the site ID, sample point number, or location code used in the sampling plan.
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Sample site address or description recorded
Document the physical address, intersection, facility area, or other clear site description.
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Sample point accessible and representative
Confirm the sample point was accessible and matched the approved siting plan or field instructions.
Field Measurements and Sample Conditions
This section captures the field conditions that affect sample validity, including disinfectant residuals and container integrity.
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Free chlorine residual measured
Record the free chlorine residual measured at the sampling point before or at collection.
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Total chlorine residual measured
Record the total chlorine residual if required by the sampling procedure or utility SOP.
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Sample bottle intact and within expiration date
Confirm the sample container was intact, sterile, and within the labeled expiration date.
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Sample collected without contamination risk
Confirm proper aseptic technique was used and no contamination event occurred during collection.
Chain of Custody and Laboratory Transfer
This section documents the handoff from field to lab so the sample trail remains traceable and defensible.
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Laboratory name recorded
Enter the receiving laboratory name or laboratory identifier.
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Sample custody transfer documented
Confirm the sample was transferred according to chain-of-custody requirements.
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Cooler temperature at transfer recorded
Record the cooler temperature when the sample was relinquished to the lab or courier.
Field Observations and Corrective Actions
This section records any deficiency seen in the field and the follow-up taken so issues are not lost after the route ends.
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Any field deficiency observed
Indicate whether any deficiency, non-conformance, or unusual condition was observed during sampling.
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Corrective action or follow-up documented
Describe any corrective action taken, resampling need, or follow-up required.
Inspector Sign-Off
This section confirms the log was reviewed, completed, and submitted by the responsible person.
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Inspector signature
Signature of the person completing the field log.
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Review completed and log submitted
Confirm the field log was reviewed for completeness and submitted per procedure.
How to use this template
- Set up the log before the route begins by pre-filling the sampling event type, date, approved site list, and any required lab or project identifiers.
- At each location, record the site identifier and address or description, then confirm the point is accessible and representative before collecting the sample.
- Measure and enter free chlorine residual and total chlorine residual, and verify the bottle is intact, in date, and handled in a way that avoids contamination.
- Document the laboratory name, custody transfer details, and cooler temperature at handoff so the sample trail remains traceable from field to lab.
- Record any field deficiency, note the corrective action or follow-up, and complete the inspector sign-off only after the log has been reviewed for completeness.
Best practices
- Record the sample time at the moment of collection, not from memory after the route is finished.
- Use the exact approved site identifier and avoid informal nicknames that can confuse repeat sampling or lab review.
- Measure and document disinfectant residuals before the sample leaves the site so the reading reflects field conditions.
- Treat bottle integrity and expiration date as a critical check, and replace any container that is damaged, unlabeled, or out of date.
- Note any reason the site was not fully representative, such as access issues, temporary plumbing changes, or unusual flow conditions.
- Document custody transfer with the receiving lab name, time, and cooler temperature so there is no gap between collection and receipt.
- Write the corrective action in plain language, including who was notified and whether a resample, site change, or other follow-up was required.
What this template typically catches
Issues teams running this template most often surface in practice:
Common use cases
Frequently asked questions
What sampling events does this RTCR field log cover?
This template is built for routine, repeat, and triggered bacteriological sampling events tied to the Revised Total Coliform Rule. It captures the sample date and time, site identification, field measurements, and transfer to the laboratory. If your program also tracks special investigations or operator follow-up, you can add those fields without changing the core log structure.
How often should this log be used?
Use it every time a bacteriological sample is collected in the field, not just during routine rounds. That includes repeat samples after a positive result and triggered samples after an operational event or distribution concern. Consistent use helps preserve the sampling record and makes it easier to compare events over time.
Who should complete the field log?
The sample collector or field technician should complete the log at the time of collection, with a supervisor or reviewer checking it before submission. The person signing off should be able to verify the site, the sample conditions, and the custody transfer. If your utility uses contractors, the same expectations should apply to them.
What regulatory or standards framework does this support?
This template supports drinking water sampling documentation aligned with the Revised Total Coliform Rule and common utility quality practices. It also helps maintain defensible chain-of-custody records and field notes that support lab results and corrective action decisions. Local primacy agency requirements may add site-specific or reporting fields.
What are the most common mistakes this log helps prevent?
Common problems include missing sample times, unclear site descriptions, incomplete chlorine residual readings, and weak custody documentation. Another frequent issue is failing to note whether the sample point was accessible and representative at the time of collection. This template prompts the collector to capture those details before the record is closed.
Can this template be customized for our utility or lab workflow?
Yes. You can add fields for sample ID, distribution zone, pressure, turbidity, disinfectant type, or lab accession number if those are part of your workflow. Many teams also add a required photo or GPS field for remote sites, as long as the core sampling and custody details remain easy to complete in the field.
How does this compare with an ad hoc paper note or spreadsheet?
An ad hoc note often misses one of the details that makes a sample defensible later, such as residual readings, bottle condition, or transfer temperature. This template standardizes the sequence of capture so the collector records the same critical information every time. That makes review faster and reduces back-and-forth with the lab or compliance team.
What should be done if a field deficiency is found during sampling?
Document the deficiency immediately, then record the corrective action or follow-up before submitting the log. Depending on the issue, that may mean recollecting the sample, replacing a damaged bottle, selecting a different approved site, or notifying a supervisor. The key is to show what happened and how it was resolved, not just that a problem existed.
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