Recreational Water Illness (RWI) Fecal Incident Response Log
Log a fecal incident response from discovery through hyperchlorination, contact time, water testing, and reopen approval. Use it to document pool closure, treatment, and health authority notification in one record.
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Overview
This template records the full response to a recreational water illness (RWI) fecal incident, from the moment the contamination is discovered through pool closure, removal of fecal matter, hyperchlorination, contact time verification, water chemistry checks, and reopen authorization. It is built for formed stool and diarrheal incidents in pools, spas, and other aquatic areas where the operator must prove that the water was treated and tested before bathers returned.
Use it when a fecal incident requires a documented response under CDC Model Aquatic Health Code guidance or local health authority rules. The form captures the incident type, baseline free chlorine and pH, cyanuric acid level, chemical dose added, target chlorine level, elapsed contact time, post-treatment chemistry, and any required health department notification. It also creates a retention record for the reopen decision and supporting photos of test results.
Do not use this as a generic pool maintenance log or for non-fecal contamination events. It is not meant for routine daily chemistry checks, filter service, or minor debris cleanup. It is also not enough by itself if your jurisdiction requires additional reporting, closure signage, or operator certification documentation. The value of the template is that it turns a time-sensitive incident into a clear, auditable sequence with measurable reopen criteria and a defensible record of who approved the pool to reopen.
Standards & compliance context
- The template supports CDC Model Aquatic Health Code fecal incident response guidance by documenting closure, disinfection, contact time, and reopen approval.
- It helps facilities align with local public health and Authority Having Jurisdiction requirements that may add notification, signage, or retention obligations.
- The water chemistry fields support operator documentation practices commonly expected under aquatic facility standards and public health inspections.
- If your facility operates under a state or municipal pool code, use this log alongside those rules because local requirements may be stricter than model guidance.
- Retention and signature fields help create an auditable record for health department review, incident follow-up, and internal quality control.
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
Incident Identification and Initial Response
This section establishes what happened, where it happened, and whether the pool was closed immediately, which sets the compliance timeline.
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Date and time fecal incident was discovered
Record the exact date and time the incident was first observed by staff.
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Name and role of staff member who discovered the incident
Enter the full name and job title (e.g., Lifeguard, Pool Operator) of the staff member who identified the incident.
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Pool or aquatic area where incident occurred
Specify the pool name or zone (e.g., Main Pool, Kiddie Pool, Lap Lane Area, Splash Pad).
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Incident classification
Classify the incident type per CDC MAHC guidance. Formed stool and diarrheal incidents require different hyperchlorination targets. Vomit incidents follow a separate protocol.
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Pool was immediately closed to all bathers upon discovery
All swimmers must be cleared from the affected pool immediately. Do not allow re-entry until the full disinfection protocol is complete and reopen criteria are met.
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Fecal matter removed from pool using a net or scoop (do not vacuum)
Remove as much fecal material as possible using a net or scoop. Dispose of material in a sanitary waste container. Do NOT use a pool vacuum, as this can spread contamination. Disinfect the net/scoop after use.
Pre-Hyperchlorination Water Chemistry Baseline
This section captures the starting water conditions that determine whether treatment can work as required.
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Baseline free chlorine (FC) level — pre-treatment
Measure and record the current free chlorine concentration in ppm before adding any hyperchlorination chemicals.
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Baseline pH level — pre-treatment
Record the current pH. CDC guidance requires pH to be adjusted to 7.5 or lower before hyperchlorination to maximize disinfection efficacy. At pH 7.5, chlorine is approximately 50% in the active hypochlorous acid (HOCl) form.
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pH adjusted to 7.5 or below prior to hyperchlorination
If baseline pH exceeds 7.5, add pH-decreasing chemical (e.g., muriatic acid or sodium bisulfate) and retest before proceeding. Document adjustment in comments.
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Cyanuric acid (CYA) / stabilizer level — pre-treatment
Record CYA level. Note: CDC MAHC recommends that pools with CYA present use higher chlorine targets or drain/dilute, as CYA significantly reduces chlorine disinfection efficacy against Cryptosporidium. If CYA > 15 ppm, consult your state/local health authority.
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Water temperature at time of incident
Record pool water temperature. Temperature affects CT (concentration × time) calculations. Cooler water may require extended contact times.
Hyperchlorination Protocol
This section documents the actual disinfection step, including the target chlorine level, chemical dose, and system operation during treatment.
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Hyperchlorination target free chlorine level based on incident type
Select the CDC-recommended target free chlorine level for this incident type. Formed stool: 2 ppm. Diarrheal: 20 ppm. These targets assume pH ≤ 7.5 and no cyanuric acid.
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Type and amount of hyperchlorination chemical added
Record the chemical name (e.g., liquid sodium hypochlorite 12.5%, calcium hypochlorite granules, trichlor), concentration, and quantity added (gallons or pounds). Include lot number if available.
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Date and time hyperchlorination chemical was added
Record the exact time hyperchlorination began. This is the START time for CT (concentration × time) calculation.
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Confirmed free chlorine level reached after chemical addition
Test and record the free chlorine level after chemical addition and circulation. Must meet or exceed the target level (2 ppm for formed stool; 20 ppm for diarrheal) before starting the contact time clock.
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Confirmed pH level after chemical addition
Retest pH after adding hyperchlorination chemicals. Must remain at or below 7.5 throughout the contact time period.
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Circulation/filtration system confirmed running during entire contact time
The pool recirculation and filtration system must run continuously during the full contact time period to ensure uniform distribution of the disinfectant throughout the pool volume.
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Pool filter backwashed after contact time is complete (diarrheal incidents)
For diarrheal incidents, CDC recommends backwashing the pool filter after the contact time is complete to remove Cryptosporidium oocysts captured in the filter media. For formed stool incidents, backwashing is recommended but may not be required by all jurisdictions — confirm with local AHJ.
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Additional notes on hyperchlorination process
Document any deviations, challenges, or additional steps taken during hyperchlorination (e.g., multiple chemical additions, equipment issues, partial pool treatment).
Contact Time Verification (CT Value)
This section proves the water stayed at the required disinfectant level long enough to meet the response protocol.
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Required minimum contact time for this incident type
Select the minimum contact time required based on incident classification and CDC MAHC targets.
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Contact time start — date and time
Record the date and time when the target free chlorine level was confirmed and the contact time clock officially started.
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Contact time end — date and time
Record the date and time when the required contact time was completed.
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Total elapsed contact time (minutes)
Calculate and record the total elapsed time in minutes from contact time start to end. Must meet or exceed the required minimum (25 min for formed stool; 765 min for diarrheal).
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Free chlorine level confirmed at or above target throughout contact time
Confirm that free chlorine was tested at regular intervals during the contact time and remained at or above the target level (2 ppm or 20 ppm). If chlorine dropped below target at any point, the contact time clock must be restarted.
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pH confirmed at or below 7.5 throughout contact time
Confirm that pH remained at or below 7.5 for the entire contact time period. pH above 7.5 reduces disinfection efficacy and may invalidate the CT calculation.
Post-Treatment Water Chemistry and Reopen Criteria
This section confirms the pool meets reopen thresholds after treatment and before bathers return.
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Post-treatment free chlorine level
Measure free chlorine after contact time is complete. Pool must not reopen until free chlorine is reduced to the safe operating range (typically 1–10 ppm for most jurisdictions; confirm with local AHJ). Excess chlorine may require dilution or dechlorination.
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Post-treatment pH level
Confirm pH is within the safe operating range (7.2–7.8 per CDC MAHC) before reopening.
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Post-treatment combined chlorine (chloramines) level
Record combined chlorine level. Should be below 0.4 ppm per CDC MAHC. Elevated combined chlorine may indicate incomplete disinfection or need for breakpoint chlorination.
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Post-treatment total alkalinity
Record total alkalinity. Acceptable range is typically 60–180 ppm. Alkalinity outside this range can destabilize pH control.
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All post-treatment water chemistry parameters are within acceptable limits for reopening
Confirm that free chlorine, pH, and all other required parameters are within safe operating ranges per CDC MAHC and local health authority requirements before authorizing reopen.
Reopen Authorization and Record Retention
This section records who approved reopening, whether the health authority was notified, and how the incident file will be retained.
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Local health authority notified of diarrheal incident (if required by jurisdiction)
Many state and local health codes require notification of the health authority for diarrheal fecal incidents. Check your jurisdiction’s requirements. If not applicable (formed stool only), select N/A and document in comments.
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Health authority notification date, time, and contact name (if applicable)
If the health authority was notified, record the date, time, method of notification (phone, email, online portal), and the name of the health authority contact.
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Pool reopened — date and time
Record the official date and time the pool was reopened to bathers after all reopen criteria were confirmed met.
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Name and role of staff member authorizing pool reopen
Enter the full name and role (e.g., Certified Pool Operator, Aquatic Director, Health Inspector) of the person who authorized the pool to reopen.
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Photo documentation of post-treatment water chemistry test results
Attach a photo of the test kit or digital reader showing post-treatment free chlorine and pH readings. This provides visual evidence for health department audits.
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This log will be retained on file for a minimum of 2 years (or per local AHJ requirement)
Confirm that this completed log will be stored in the facility’s records system for the required retention period. Confirm the retention period with your state/local health authority.
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Inspector / Pool Operator Signature
Signature of the Certified Pool Operator (CPO) or responsible aquatic staff member completing this log.
How to use this template
- 1. Record the discovery details immediately, including date, time, location, staff name and role, and whether the incident is formed stool or diarrheal contamination.
- 2. Close the affected pool or aquatic area to all bathers at once and document that fecal matter was removed with a net or scoop rather than vacuumed.
- 3. Enter the pre-treatment water chemistry baseline, including free chlorine, pH, cyanuric acid, and water temperature, and confirm pH is adjusted to 7.5 or below before hyperchlorination.
- 4. Document the hyperchlorination step by noting the target free chlorine level, chemical type and amount, time added, measured chlorine and pH after dosing, and whether circulation and filtration stayed on throughout contact time.
- 5. Verify the full contact time, then record post-treatment chemistry, filter backwash for diarrheal incidents if required, and any health authority notification details.
- 6. Approve reopening only after all reopen criteria are met, attach photo evidence of test results, and retain the completed log for the required period or longer if the AHJ requires it.
Best practices
- Document the incident as soon as it is discovered so the closure time and treatment timeline are defensible.
- Treat formed stool and diarrheal incidents differently, since the required chlorine target and contact time are not the same.
- Measure and record pH before treatment and again after treatment, because chlorine effectiveness depends on pH control.
- Keep circulation and filtration running for the entire contact time and note any interruption as a deficiency.
- Use a calibrated test method that can verify the required free chlorine range, not a rough visual estimate.
- Photograph the post-treatment test results before reopening so the record shows the actual readings used for approval.
- Backwash the filter after the required contact time for diarrheal incidents when your protocol or local guidance calls for it.
- Do not rely on memory for the reopen decision; require a named staff member to sign off after all criteria are checked.
What this template typically catches
Issues teams running this template most often surface in practice:
Common use cases
Frequently asked questions
What incidents should this log be used for?
Use this log for formed stool incidents and diarrheal fecal incidents in pools, spas, and other aquatic areas where a response, disinfection, and reopen decision are required. It is designed to capture the full sequence from discovery to reopening, not just the cleanup. If the event does not involve fecal contamination, a different incident or maintenance log is usually a better fit.
How often should this template be completed?
Complete it every time a fecal incident occurs, even if the response is straightforward. Each incident should have its own record so the closure time, chemical treatment, contact time, and reopen approval are traceable. If your facility has multiple aquatic bodies, keep a separate log entry for each affected pool or area.
Who should fill out and sign the log?
The staff member who discovers the incident should start the record, and the pool operator or other authorized supervisor should verify treatment and approve reopening. In many facilities, a trained aquatics lead, certified pool operator, or designated competent person handles the final review. The signature should reflect who had authority to reopen the water, not just who performed the cleanup.
Does this template align with CDC MAHC guidance?
Yes, the structure follows the CDC Model Aquatic Health Code approach to fecal incident response, including closure, removal of fecal matter, hyperchlorination, contact time, and reopen criteria. It also supports local health department expectations when notification is required. Always confirm your jurisdiction’s adopted code or local health authority rules, since some requirements are stricter than the model guidance.
What are the most common mistakes this log helps prevent?
Common misses include reopening before the full contact time is complete, failing to document pH before and after treatment, and not recording the actual chlorine level reached. Another frequent issue is skipping the note that the circulation and filtration system stayed on during the entire treatment period. The log also helps prevent vague entries like 'treated pool' that do not show what was done or when.
Can this template be customized for different pool types or jurisdictions?
Yes, you can add fields for splash pads, lazy rivers, therapy pools, or spa-specific reopen criteria if your site uses them. You can also adjust the target chlorine levels, contact times, notification steps, and retention period to match local AHJ requirements. Facilities with stricter internal rules often add a manager approval line or a second verification signature.
How does this compare with an ad-hoc incident note?
An ad-hoc note usually captures only the cleanup, while this template captures the operational and compliance steps needed to justify reopening. That matters because fecal incident response is time-sensitive and depends on measurable water chemistry, not just a verbal confirmation. A structured log also makes it easier to audit patterns, train staff, and show due diligence after the fact.
Should this log be integrated with other pool records?
Yes, it works best alongside daily pool chemistry logs, maintenance records, and health department notification records. Linking it to your chemical inventory or pool operations system can help verify what product was used and when. If you already use a digital inspection platform, this template can serve as the incident-specific record that connects to your broader aquatic compliance file.
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