The new GSS meter reading standard has changed how water retailers need to think about long unread meters.

From 1 October 2025, every non-smart meter must be read at least once within a 13-month period. For existing portfolios, the first compliance deadline falls in November 2026. That means long unread meters are no longer just an operational challenge. They are now a compliance risk with potential financial consequences.

For many retailers, the issue is not knowing where the long unread meters are. The bigger challenge is actually getting them resolved.

A lot of LUM activity can look successful at first. The easier external meters are cleared, read rates improve, and the portfolio appears to be moving in the right direction. But often, the hardest meters are left behind.

These are usually the longest-standing LUMs. They are often internal, access-restricted, linked to unclear occupancy, or sitting within sites where previous visits have failed. Under the new GSS requirements, this residual work pot is where the real risk can build.

Data, tracing and portfolio analysis all play an important role. They help retailers understand where the risk sits and which meters should be prioritised.

But they cannot obtain a physical meter read.

At some point, someone still needs to attend site, attempt access, gather evidence, and close the job out properly. Without that field layer, retailers risk identifying the problem without fully resolving it.

Each service area plays an important role in helping clients get closer to the truth behind their data, assets and customers. From locating long unread meters and verifying vacant properties, to identifying hidden consumption, supporting leakage reduction and assisting with compliant revenue recovery, Occutrace provides the field expertise and evidence needed to resolve complex challenges.

Occutrace supports water retailers by taking long unread meters from investigation through to practical resolution.

That includes:

• Reviewing and segmenting LUM portfolios
• Validating occupancy and site information
• Attempting access for both internal and external meters
• Capturing opening hours, access notes and site intelligence
• Re-attending where access windows are identified
• Evidencing vacant properties, refused access or restricted access
• Supporting warrant processes where required
• Providing clear audit trails and evidence packs

The aim is not just to get a read once. It is to reduce the chance of that meter falling straight back into long unread status again.

The first GSS compliance deadline for existing portfolios may feel like there is time, but the hardest meters are rarely resolved quickly.

Retailers need to know:

• Which meters are still unread
• Which sites are genuinely difficult to access
• Where occupancy data may be wrong
• What evidence exists where access has failed
• Whether the remaining work pot is actually being reduced

The key question is no longer just “how many meters have we attempted?”

It is “how many have we properly resolved?”

If you are unsure what your long unread meter position could mean commercially, our GSS calculator is a useful place to start.

It helps water retailers estimate potential exposure across their non-smart meter portfolio and understand the possible impact of meters remaining unread ahead of the November 2026 deadline.

It is not about creating panic. It is about giving teams a clearer view of the scale of the issue, so they can prioritise the right meters, plan field activity, and make informed decisions before the deadline arrives.