What a septic contractor needs from you

The first part of most septic visits is an interview. Where is it, when was it last done, what have you noticed, what changed. That conversation is necessary, it is on your time, and almost all of it could have been written down beforehand.

This is what to have ready, and — as importantly — what to say when you genuinely do not know.

The four things that change what happens on the day

Plenty of information is nice to have. Four items actually change what a professional can accomplish on a first visit, and they are worth chasing before the others.

What	Why it changes the visit
Where the components are	A visit that starts with an hour of probing is an hour not spent assessing. If you know, say so; if you have a plan, have it out.
When it was last pumped, and what was found	The interval sets expectations. What was found last time is what this visit gets compared against.
What you have observed, and when it started	A symptom that started after heavy rain and one that has been building for six months point in different directions.
What access is available	Whether a truck can reach the tank decides whether the work can happen at all that day.

Records worth having, in order of usefulness

Most of these can be obtained without anybody visiting the property, and most cost nothing.

The permit file from the health or environmental authority with jurisdiction — permit, as-built or site plan, and any inspection or repair records they hold.
Any prior inspection report, in full rather than the summary page.
Pumping invoices, particularly if they note sludge depths or the condition of the outlet.
Repair paperwork, including anything replaced and when.
Alarm or control panel documentation, if the system has one.
The property disclosure from when you bought, which sometimes records things nobody has mentioned since.
Your own photographs of the field in wet and dry weather, dated.

What to say when you do not know

Say "unknown". It is a real answer, it is common, and it is far more useful than a guess that gets treated as fact and then quietly relied upon.

What matters is keeping the difference visible between three things that often get flattened into one: what a document says, what somebody told you, and what you believe. A professional can work with all three as long as they can tell them apart.

Confirmed by a record — there is a document and you can produce it.
Told to you by a previous owner or a service provider — useful context, worth confirming.
What you believe, without a record — honest, and labelled as such.
Unknown — the gap is itself information, and it tells them where to spend their time.

What to tell them about access

Access is the most common reason a visit achieves less than it should, and every item on this list is something you know and they do not.

Whether the property is gated or locked, and how they get in.
Whether pets will be onsite.
Whether a tenant needs to be coordinated with.
Driveway width, grade, and whether a heavy truck can turn.
Whether landscaping, a deck, a patio, a shed or a driveway sits over or near the suspected components.
Whether they will need to reach an electrical or control panel.
Whether indoor plumbing access is available, and to which rooms.
Whether water supply is available onsite.
Who will be there, and whether they can authorise work.

What not to do before the visit

A short list, and the first one is the important one.

Do not open, uncover, move or dig to anything. Tell them what you know about locations and let them decide how to reach it — that work carries confined-space, gas and fall risks and it is theirs to manage.
Do not clean up, hose down, cover or drain the condition you called about. Changing it makes it harder to assess.
Do not reduce water use to unusual extremes in the days beforehand, unless a backup or alarm is active. A system tested when it has been unloaded for a week is being asked for less than normal.
Do not reconstruct dates from memory and present them as records. Mark them as recollection.
Do not diagnose it for them before they arrive. Describing what you observed is helpful; naming the component you think has failed narrows the visit prematurely.

What to ask them before you book

Which of these services do you actually perform — inspection, pumping, repair, drainfield work, design, installation?
Does this visit have prerequisites — access, a pump-out first, records, somebody present?
What will I have at the end: a verbal opinion, a written report, a proposal, or all three?
Roughly how long will you be here?
What do you need me to have ready?

Putting it together

The project planner walks through all of this and prints a summary you can hand over, with space for the professional to record what they observed and what they could not reach. It saves in your browser only, and nothing is sent anywhere unless you choose to request help and review what would go first.

If you would rather work from paper, the site-visit checklist covers the same ground in a form you can print and tick.

Common questions

What if I have no records at all?

Very common, particularly on older properties, and it says nothing about the condition of the system. Start with the permit file from the authority with jurisdiction — that is usually the fastest route from nothing to something. Then start your own record from this visit onward.

Should I tell them what I think is wrong?

Tell them what you observed, in detail. Naming the component you suspect tends to narrow the visit toward that component, which is fine if you are right and expensive if you are not.

Is it worth getting the permit file before a first visit?

Usually yes, and it is often free. It tells you what the system was designed to be, which is the reference point for everything a professional will observe.

They said they would locate the system. Do I still need to know where it is?

They may well find it faster than you can. The reason to know is not the visit — it is every future decision about planting, paving, parking and building on your own property.