Ready For The Rush? Run This Audit Based on the CDC's 2024 Model Aquatic Health Code (MAHC) Inspection Form

Memorial Day weekend is the unofficial starting gun of pool season — and for commercial facility operators, it's also the highest-stakes weekend of the year. Bather loads spike, staff are stretched thin, and health inspectors know it's prime time to make their rounds.

The facilities that sail through opening weekend aren't necessarily the ones with the newest equipment or the biggest budgets. They're the ones that ran a thorough pre-season audit with enough time to fix what they found.

We built this checklist directly from the CDC's 2024 Model Aquatic Health Code (MAHC) Aquatic Facility Inspection Form — the same form your health department inspector carries. Work through it now, while you still have time to restock, repair, and get compliant before the crowds arrive.

⚠️ Testing & Reagents — Start Here

This is the section that trips up even well-prepared facilities, so we're putting it first.

You can have a full chemical room and still be flying blind if your test kit isn't stocked, calibrated, and using fresh reagents. Expired or depleted reagents produce unreliable readings — and decisions made on bad data are hard to defend in front of an inspector, a health department, or a concerned parent.

MAHC Item #19 (critical): NSF/ANSI Standard 50-approved DPD test kit required on site and in use.

Run through this before anything else:

• DPD test kit — Is it NSF/ANSI Standard 50-approved? Is it actually the kit your staff is using daily?
• DPD #1 and DPD #3 tablets — Do you have enough for frequent testing across a full three-day holiday weekend?
• Liquid reagents (OTO, phenol red) — When did you last check the expiration dates? Last season's bottles may not be giving you accurate readings.
• Photometer or colorimeter powder packs — Restocked and ready?
• Taylor or LaMotte reagent refill kits — Confirmed in inventory, not just assumed?
• Backup test strips — On hand for quick spot checks between full tests?

One thing we see consistently: operators reorder chlorine and shock without thinking twice, but treat reagents as an afterthought. A $15 refill kit is not the place to cut corners heading into your busiest weekend.

💧 Water Chemistry (MAHC Items #18–23)

With testing dialed in, your chemistry readings actually mean something. Here's what to verify:

• Free chlorine at the correct level for your venue type (Item #20 — critical)
• pH between 7.2–7.8 and holding steady (Item #21 — critical)
• Combined chlorine below 0.4 ppm (Item #22)
• Cyanuric acid within the approved range for outdoor facilities (Item #23 — critical)
• Total alkalinity and calcium hardness adjusters stocked and ready
• Shock/oxidizer on hand for a post-weekend super-chlorination treatment
• Algaecide ready for a preventative dose before the bather load hits
• Water temperature at or below 104°F (Item #18)

A heavier-than-usual bather load will stress your chemistry fast. Go into the weekend with levels tight and extra chemistry on the shelf — not just enough to get by.

🔧 Equipment & Chemical Room (MAHC Items #24–34)

A chemistry problem you can catch. An equipment failure mid-weekend is a different kind of crisis.

• Automated chemical feeder operational and calibrated (Item #24 — critical)
• Automated controller functioning correctly (Item #25)
• Flow meter present and reading accurately (Item #27)
• Recirculation pump approved, in good repair, running (Item #28 — critical)
• Filter approved, in good repair, operating (Item #29 — critical)
• Pump strainer baskets clean and unclogged (Item #30)
• Filter gauges working at inlet, outlet, and strainer (Item #31)
• UV or ozone system functioning properly if present (Item #32)
• Spare O-rings, gaskets, and filter media (cartridges or DE powder) in stock
• All chemicals properly labeled, stored safely, and secured (Item #33)
• PPE stocked and accessible in the chemical room (Item #34)

If you don't have a spare O-ring for your pump lid or a backup pressure gauge, add those to your order now. They're inexpensive items that cause expensive problems when they're missing.

🏊 Pool & Spa Area (MAHC Items #1–18)

Walk the perimeter with fresh eyes — not the eyes of someone who's looked at it every day for months.

• Enclosure, fencing, and gates in good repair; self-latching hardware operational (Items #1–2 — critical)
• GFCI electrical receptacles and protected overhead wiring (Item #3 — critical)
• Grab rails and ladders secured; deck and shell in good repair (Item #4)
• Safety/float line clearly in place (Item #5)
• Depth markers, no-diving signs, and stair stripes visible and legible (Item #6 — critical)
• Main drain grate secured and in good repair (Item #9 — critical)
• Water clarity — can you see the main drain clearly from the deck? (Item #10 — critical)
• Skimmer weirs, baskets, and covers clean and functioning (Item #7)
• Emergency phone or communication device available and clearly marked (Item #13 — critical)
• First aid kit fully stocked (Item #14)
• Life rings, throw ropes, and rescue hook in good repair (Item #15 — critical)
• Lifeguard coverage confirmed and adequate for peak weekend hours (Item #16 — critical)
• Bathing load, rules, and chemical signage legible and properly posted (Item #17)

Safety items flagged as critical on the MAHC form are non-negotiable — they can trigger an automatic failing grade regardless of how well everything else scores.

🚿 Hygiene Facilities (MAHC Items #35–39)

Often the last thing on the pre-season list, and one of the first things patrons and inspectors notice.

• Restrooms clean, in good repair, and fully stocked (soap, paper towels, toilet paper — double your normal supply for a holiday weekend)
• Rinse and cleansing showers accessible and operational
• Diaper-changing station stocked with sanitizer and adjacent trash can
• Clean and used equipment properly separated

📋 Records & Compliance (MAHC Items #40–47)

The paperwork side of compliance is easy to let slide — until an inspector asks for it.

• Operator training certifications on site and current (Item #40)
• Lifeguard training certifications on site and current (Item #41)
• Most recent inspection report posted conspicuously at each entrance (Item #42)
• Daily operator inspection checklist actively in use (Item #43)
• Chemical logs filled out daily; corrective actions documented (Items #45–46)
• Emergency Action Plan on site and easy for staff to locate (Item #47)

If your EAP hasn't been reviewed with staff recently, before Memorial Day weekend is the right time to do it.

What to Do If Something's Not Checking Out

Hopefully most of this list is already looking solid. But if you found gaps — especially in reagents, chemistry supplies, or safety equipment — the time to act is now, not Thursday before the holiday.

Regional supply shortages are real around Memorial Day. Chlorine, shock, and reagent refill kits all move fast this time of year. Getting your order in early is the difference between being prepared and being scrambling.

We stock everything on this list: Taylor and LaMotte reagent refill kits, DPD tablets, NSF/ANSI 50-approved test kits, filter media, O-rings, chemicals, and safety equipment. Our team can help you pull together a commercial order quickly.

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Checklist based on the CDC's 2024 Model Aquatic Health Code (MAHC) Aquatic Facility Inspection Form (CS356382-A). Critical items noted are those which result in an automatic failing grade regardless of total inspection score.