Septic Checklist for Holiday-Letting Owners & Managers

Hastings Septic Co’s septic checklist for holiday-letting owners covers three points in the calendar: a pre-season check before the summer and Easter surge, a quick look before every changeover, and the red-flag signs to watch for while guests are still in the house. Lake Cathie, Bonny Hills and the Camden Haven carry a high concentration of holiday-letting properties, and an occupancy jump from empty to full for weeks at a stretch is exactly the load pattern that catches an overdue tank or a lapsed AWTS service out.

This page is written for owners who manage their own short-stay property and for property managers juggling several. Neither group needs to become a septic expert; both benefit from a simple, repeatable routine that runs on the booking calendar rather than on memory. Where it’s useful, we’ve drawn on our wet-season septic checklist as well, since a lot of Hastings holiday season falls either side of the wettest months.

Why does holiday letting put more strain on a septic system than a full-time home?

A permanently occupied home produces steady, predictable wastewater: the same two or three people, roughly the same routine, week after week. A holiday letting does the opposite. It sits empty for stretches, then jumps to full occupancy, sometimes eight or ten guests, for a weekend or a school-holiday fortnight, then goes quiet again. That shock loading is harder on a septic tank or an aerated wastewater treatment system (AWTS) than the same average number of showers spread evenly across the year.

Two things make this sharper around here. First, geography: Lake Cathie, Bonny Hills and the Camden Haven have a genuinely high concentration of holiday-letting properties, many on older systems that predate the sewer network or were only ever designed for a couple of permanent residents. Second, timing: the biggest occupancy spikes, over the Christmas-January peak and around Easter, land on exactly the systems least equipped to absorb them without some attention beforehand.

None of this means holiday letting is bad for a septic system. It means the maintenance routine has to be built around bookings, not around the calendar year the way it would be for an owner-occupied house.

What should you check before the season starts?

Do this once, well ahead of your first peak booking, ideally in spring before the summer rush and again before Easter if your calendar runs busy that week too.

1. Confirm when the tank was last pumped, or the AWTS last serviced. No records is a red flag in itself; treat it as “due now” rather than guessing.
2. Book a scheduled pump-out or AWTS service if it’s due, or close to due. A tank that’s fine in March can be marginal by the time back-to-back bookings have run through it in December.
3. Check the AWTS alarm panel, if you have one. A red light or buzzer now, before the season, is a far better time to find a fault than the week guests arrive.
4. Locate and expose the tank lid. If it’s buried under lawn or garden bed, dig it clear before you need a truck on site urgently. This alone can keep an emergency call-out closer to a routine price.
5. Sort access. Note anything a vacuum truck would need to know: gate codes, steep driveway sections, where vehicles park during a booking, and pass that on when you book any service.
6. Brief cleaners and changeover staff on what not to put down drains or toilets between guests: wet wipes, sanitary items, food scraps and excess grease all shorten the time before the system needs attention.

What should you check before every changeover?

This is a much shorter list, meant to take a couple of minutes during a normal changeover clean, not a separate visit.

1. Flush and run a tap or two while you’re on site, and note whether drainage feels normal or sluggish.
2. Look and smell around the tank lid and irrigation area (for AWTS properties) for pooling, wet patches or odour.
3. Check the AWTS control panel for an alarm light if the system has one.
4. Note guest numbers and length of stay if you’re tracking usage, useful evidence if you ever need to explain an unusually short interval to a technician.
5. Flag anything unusual in your changeover notes so a pattern (three changeovers in a row with slow drains, say) doesn’t get lost between different cleaners or property managers.

What are the red-flag signs to watch for while guests are staying?

Guests won’t always tell you about a slow drain until it’s a blocked one, and by the time they do, the booking may already be affected. Watch for, or ask cleaners and changeover staff to watch for:

• Slow-draining sinks, showers or toilets across more than one fixture in the house
• Gurgling drains or toilets that don’t flush cleanly
• Sewage odour near the tank, irrigation area or under the house
• Wet, soggy or unusually green ground over the tank or trenches
• An AWTS alarm light or buzzer sounding
• Any backup or overflow, which is always urgent

Any one of these mid-booking is worth acting on immediately rather than waiting for the changeover. A system that’s struggling with guests still in the house rarely improves on its own before checkout.

What does an emergency changeover call-out cost compared with a routine service?

The gap between a booked, routine job and an urgent one during a changeover is one of the clearest reasons to run a pre-season and changeover checklist in the first place. Our published cost guide includes an indicative composite example (not a real past job) that illustrates it well: a holiday rental at Lake Cathie backing up mid-changeover on a Saturday, guests arriving, priced indicatively at $600-$900+ all-in. The same tank, booked as a routine job with decent access, would typically sit closer to $400-$500.

*Indicative ranges only, drawn from our published septic and AWTS servicing pricing; every job is confirmed by a firm quote before work starts. Add-ons like an after-hours or urgent call-out typically add $150-$400+ on top of the base job price.

The pattern holds regardless of exact numbers: booked-ahead, easy-access work is consistently the cheapest way to buy this service, and an urgent weekend job during a changeover is consistently the most expensive. A pre-season and changeover checklist exists specifically to keep you in the cheaper column.

Should servicing run on a fixed schedule, or follow your booking calendar?

Both, ideally. A conventional septic tank still wants pumping on roughly a 3-5 year cycle regardless of how it’s used, but a holiday letting with heavy peak-season occupancy is a candidate for the shorter end of that range rather than the longer one. An AWTS needs its scheduled servicing (commonly quarterly, depending on the system’s accreditation and your council approval conditions) on top of, not instead of, keeping an eye on how guest numbers are tracking.

Where the booking calendar matters most is timing, not frequency: getting a due pump-out or AWTS service done in the shoulder season before peak bookings, rather than letting it slide into the exact weeks the property is busiest. If you manage several holiday-letting properties, this is where a documented schedule pays for itself: instead of reacting to a complaint from a guest or a bad review, servicing happens quietly between bookings.

We arrange holiday rental septic servicing built around exactly this: visits timed to shoulder seasons and gaps in your booking calendar rather than a generic annual date, arranged through appropriately licensed liquid-waste operators and appropriately qualified AWTS technicians.

Does this checklist change for an AWTS instead of a conventional tank?

The overall structure (pre-season check, changeover glance, mid-booking red flags) is the same, but an AWTS adds a mechanical layer a conventional tank doesn’t have. An aerated system is a small treatment plant with a blower, pumps and usually a disinfection stage, and those components can fail independently of how full the tank is. A blower can die the week after a full pump and desludge; a float switch can stick regardless of guest numbers.

Practically, that means an AWTS property needs the alarm panel checked at every changeover, not just watched for after guest complaints, and its scheduled service kept current year-round, since a lapsed service is invisible until something fails. Properties around Lake Cathie and Bonny Hills and the Camden Haven have a genuine mix of older conventional tanks and newer AWTS installs, so it’s worth knowing which one you’re managing before the season starts, not during it.

Holiday-Letting Septic FAQs

How far ahead of summer should we book a pre-season septic check?

Aim for spring, well before the December-January peak, so there’s time to book a pump-out or AWTS service and, if something’s found, get it sorted before guests arrive. Leaving it until the week before your first big booking removes any margin if the tank turns out to be overdue or the AWTS needs a part.

Our booking calendar is full most weekends: when is there ever a good time to service?

Look for the quieter shoulder weeks either side of the main summer run, or the gap between the Christmas-January peak and the Easter one. Even a single weekday gap between bookings is usually enough for a routine pump-out or AWTS service visit.

Do we need to tell guests anything about the septic system?

Generally no more than any considerate host would: a short note about not flushing wipes or sanitary items, and going easy on the laundry all in one day, protects the system without turning the guest experience into a lecture. Anything more (like access for a scheduled service) is between you and whoever’s servicing the property.

One of our changeover cleaners reported a bad smell near the tank. Is that urgent?

Treat a persistent sewage smell as worth acting on promptly, especially with a booking arriving soon. An occasional whiff after heavy rain can be nothing, but a smell that lingers, or comes with slow drains or wet ground, is exactly the kind of red flag this checklist is built to catch before it affects a guest’s stay.

We manage several properties across Lake Cathie and the Camden Haven: can servicing be scheduled across all of them together?

Yes, that’s a sensible way to run it. Send details for each property (address, system type if known, rough last-service date) through our contact page and we can look at grouping visits sensibly across the portfolio, which also tends to help on travel-related costs.

What’s the single most useful habit for a holiday-letting owner to start?

Keep a simple log: last pump-out or AWTS service date, and a note against each changeover if drainage seemed slow or anything looked off. It costs almost nothing to maintain and turns “we think it’s due” into a five-second answer whenever you book a service.

Get your holiday-letting property on a proper schedule

If your holiday-letting property is coming into a busy season with no clear record of its last pump-out or AWTS service, that’s the first thing to fix. Tell us the property, the system type if you know it, and your rough booking pattern, and get a free quote for a pre-season check timed to suit your calendar, not the other way around.