Treat a water leak affecting multiple units as one incident with linked work orders, not separate tickets. Stop the source, find every affected unit, dry what's wet quickly, and document each unit before anything is removed. Then update residents on a set schedule, and record the cause and cost per unit so the owner, insurer or responsible party can be billed correctly.

For example: the call came from 404 at 7:40 in the morning. By 9, it was 304. By noon, 204 had a stain spreading across the ceiling.

Three calls became three tickets, handled by three technicians, each with its own notes. A week later, the insurer asks for a timeline of the incident, and nobody has one. The resident in 304 says nobody told them the drying fans would run for four days. The cost is spread across three units' repair lines, and nobody knows whether the washer hose that failed in 404 was the resident's or the building's.

Every ticket was closed properly. The incident was never managed.

Why does a multi-unit leak need its own process?

Because work orders are built around one unit, and a leak doesn't stay in one unit.

Water moves down and sideways, through ceilings, wall cavities and shared plumbing. The unit below may be wet before anyone living there notices. The cause sits in one place, but the damage, the cost and the questions afterward are spread across several.

If each unit is handled as its own ticket, three things get lost:

• the timeline: when it started, when it was stopped, and when each unit was reached

• the cause: one cause, recorded once, and linked to every unit it affected

• the cost: the total, which is what the owner and the insurer actually need

The one-incident log: five stages

Open one incident record the moment a second unit is involved. Every unit's work order links back to it, and it works through five stages.

1. Stop the source and make it safe

Shut off the water at the nearest valve that stops the flow. Check for water near electrical fixtures or panels before anyone works in a wet area. Then call in the right trade.

If the source is inside a unit and the resident isn't there, check your emergency entry rules. In California, for example, a landlord may enter a unit in an emergency without the usual written notice. Record the time of entry and the reason, as you would for any entry.

2. Find every affected unit

Don't wait for residents to call. Check:

• the units below the source, floor by floor

• the units beside it that share walls or plumbing

• vacant units, where nobody will report anything

• common areas such as corridors, stairwells and ceiling voids

Use a moisture meter, not just your eyes. A dry-looking ceiling can be wet above. Add every affected unit to the incident record as it's found.

3. Dry fast, and classify the water

Speed matters because of mold. The US EPA advises drying water-damaged areas and items within 24 to 48 hours to prevent mold growth.

The type of water matters too. The industry restoration standard, IICRC S500, sorts water into three categories by contamination level: Category 1 (clean), Category 2 (grey) and Category 3 (black).

• Category 1: water from a clean source, such as a broken supply line.

• Category 3: grossly contaminated water, such as sewage.

The category, along with the materials affected, shapes what can be dried and what has to be removed. The standard also recognizes that clean water can degrade to a worse category if it sits, so the category should be recorded with the time it was assessed.

For anything beyond a small, clean-water event, bring in a qualified restoration contractor and record the category they assign.

4. Document each unit before anything is removed

This is the step that decides the insurance claim and any cost recovery, and it can't be redone later. For each unit, record:

• photos and video, with timestamps

• moisture readings, and where they were taken

• building damage: ceilings, walls, flooring, fixtures

• residents' belongings that were affected, noted separately

• what was removed, by whom, and when

Document first, then remove. A soaked carpet thrown in a skip before anyone photographs it is evidence you can't recover.

5. Communicate, then allocate the cost

Residents. Update every affected resident on a schedule, not just when something changes. Tell them:

• when someone will need to enter their unit

• how long any drying equipment will run

• who their single point of contact is

Owner and insurer. Notify the owner the same day. Notify the insurer as the policy requires, since most policies require prompt notice.

Cost. Record the cost per unit against the incident, with the cause. That's what lets you decide who pays, which the next section covers.

What should the incident record hold?

Who pays for water damage to the unit below?

It depends on the cause, the lease, local law and the policies involved. The questions to answer are usually these:

Residents' own belongings are a separate question from the building repair. Responsibility for them can depend on the cause, the lease, local law and the policies involved, which is why the documentation in stage 4 records them separately.

RIOO's guide to insurance in multifamily property management covers the building policies. Its guide to COI tracking for vendors covers what a vendor's certificate actually proves.

Are there rules on how fast you have to respond?

Some places set them. Three examples show how much this varies.

Awaab's Law currently applies to social housing, not private rentals. The Renters' Rights Act 2025 provides for it to be extended to the private rented sector, but the private-sector timescales have not yet been set in regulations.

Even where no legal clock applies, the EPA's 24 to 48 hour drying window is a practical one. Mold doesn't wait for a statute.

Who owns each step?

What should leadership watch?

A multi-unit leak is where a site team's process shows its strengths and its gaps. Four numbers tell you which:

• Time from first report to source stopped. It shows how quickly the team contained the problem, and it's the first number to look at when reviewing an incident's cost.

• Time from report to drying equipment in place. Measure it against the 24 to 48 hour window.

• Leaks by building and source. If the same riser, roof section or appliance type keeps coming up, it's no longer a leak. It's a capital item.

• Cost recovered compared with cost absorbed. Recovery is harder when the stage 4 evidence wasn't captured.

And one control question: pick the last leak that reached more than one unit. Can the team produce its timeline, every affected unit, the total cost and the recovery decision from one record? If they have to rebuild it from separate tickets, the next claim will be harder than it needs to be.

Where RIOO fits

RIOO is property management software built directly on NetSuite.

• Maintenance requests from residents. Tenants can submit maintenance requests through RIOO, and the team assigns and tracks each one until it's completed.

• Work orders with live status. Work orders are created, assigned, prioritized and tracked with real-time updates and status overviews, so the manager can see where each unit stands.

• A maintenance history for each unit. Every completed task, inspection and maintenance record is stored against the property and the unit. That history supports capital planning and insurance documentation, which is exactly what stage 4 and the leadership review rely on.

Note:This blog is operational guidance, not legal, insurance or restoration advice. Rules on entry, repairs and response times differ by country, state and program, and they change. Last reviewed September 2026. Confirm what applies to each property with qualified professionals.

Frequently asked questions

Q1. What should a property manager do first when a leak affects multiple units?
Stop the source and make the area safe. Then find every affected unit, including the units below and beside, vacant units and common areas, and open one incident record that every unit's work order links to.

Q2. Can a landlord enter a unit without notice for a water leak?
Often, in a genuine emergency, but the rules vary. In California, a landlord may enter without the usual written notice in case of emergency. Record the time of entry and the reason, and check your local rules.

Q3. How quickly does water damage need to be dried?
The US EPA advises drying water-damaged areas and items within 24 to 48 hours to prevent mold growth. Larger or contaminated events usually need a restoration contractor.

Q4. Who pays for water damage to the unit below?
It depends on the cause, the lease, local law and the insurance policies involved. A building system failure usually falls to the owner. A resident's negligence or a vendor's faulty work may be recoverable from them, where the lease and the law allow.

Q5. Should a leak be handled as one work order or several?
Use one work order per unit, all linked to a single incident record. The work orders track the repairs. The incident record holds the cause, the timeline and the total cost.

Q6. What should be documented after a water leak?
For each unit: timestamped photos and video, moisture readings, building damage, affected resident belongings noted separately, and everything removed, with the date and who removed it. Document before anything is thrown away.

Q7. What are Category 1, 2 and 3 water damage?
They're the contamination levels in the IICRC S500 restoration standard. Category 1 is clean water, Category 2 is grey water with significant contamination, and Category 3 is grossly contaminated black water, such as sewage.

Q8. Do residents have to move out after a water leak?
Not usually, but it depends on how badly the unit is affected, the lease and local law. In England, under Awaab's Law, a social landlord that can't make a home safe in time must offer suitable alternative accommodation at its own expense.