Water source and meter inventory
Identify the routes by which water enters the selected system, then connect each route to the records that can measure it. A long meter list can still miss an incoming supply. A meter on a mixed tank outlet can also observe water already recorded elsewhere. This inventory makes those relationships visible before quantities are combined.
The seven-page pack contains instructions, four reusable blank sheets and two fictional worked pages. The DOCX is editable and the matching PDF is for printing. Both are manual records: there are no calculations, automatic checks, reminders or connections to meters. The pack produces a source and measurement inventory, not a water balance or completed disclosure.
Download the editable water source and meter inventory (DOCX).
Download the print water source and meter inventory (PDF).
List incoming routes before listing devices
Record the premises and systems included, the inventory date, the period the arrangement is intended to describe and the map version used. Ask the authorised site custodian which supply routes operated during that period and which changed. A current arrangement cannot by itself describe an earlier reporting year.
Give each distinct incoming route a source-route ID. Record the supplier or abstraction reference, entry point, destination and evidence for the connection. Keep a route in the list even when it has no meter, the meter is inaccessible or its quantity record is missing. A delivery docket, utility account or site drawing may establish different parts of the relationship.
Do not force every row into “metered” or “not applicable”. Use a specific measurement position: identified meter with records available; meter identified but records unavailable; documented non-meter quantity route; or quantity basis unresolved. Record who can resolve the gap and what evidence is needed.
EPA’s WaterSense metering guidance distinguishes facility supply meters from submeters observing particular spaces or activities. This is useful context for identifying what a device measures. Its US commercial-facility guidance does not prescribe this inventory or establish Indian reporting requirements.
Give every measurement point a physical role
Copy the measurement card for each device or non-meter record route. Keep the serial number, local alias, location, flow direction, unit, reading type and custodian separate. Record whether a reading is a cumulative counter, a volume for an interval, or a different observation such as tank level. A tank-level reading is not automatically a delivered volume.
Use the route sheet to identify what is upstream and downstream. State whether the point observes an incoming supply, a branch distribution, an internal reuse return, an outgoing route or storage. These are working labels for the selected map, not automatic reporting classifications. Unconfirmed connections remain questions for the authorised technical owner.
Retain the evidence supporting the role, including its effective dates. A device’s nickname is not enough: a screen called “main water” may refer to a tank outlet rather than the premises inlet. Record the exact relationship instead of inheriting the label as a reporting conclusion.
Record shared or mixed routes explicitly. If several sources enter one tank before a downstream meter, that meter does not necessarily distinguish the sources. Keep bypasses and alternative entry points visible even when the normal route is metered. The worksheet provides space for these relationships without asking a reporting preparer to operate valves or inspect equipment.
Work through three routes and four meters
All names, devices and records in this example are invented. The selected receiving-system boundary at Maple Works includes tank T1, the process area and internal treatment-return line. Its abstraction point is outside this selected system; this is not a whole-company reporting boundary. Map MAP1 v1, confirmed by the fictional authorised facilities custodian, describes the arrangement throughout September 2026. No other incoming route is present in this teaching case.
Route S1 brings municipal water through M10 into T1. Route S2 brings borewell water through M20 into the same tank. Route S3 brings tanker deliveries through fill point F1, downstream of both inlet meters. The receiving log confirms that deliveries used F1, but the supplied docket records vehicle capacity rather than actual delivered quantity. No accepted alternative quantity evidence is included.
M30 sits on T1’s outlet to the process area. M40 measures a return from the site’s own treatment system back into T1. Both points are inside the selected boundary. The technical map confirms that M30 can observe mixed water from the incoming routes and the return, while M40 observes an internal movement. They are not two additional external supplies.
The inventory therefore lists three incoming routes and four physical meters. M10 and M20 are the identified measurement points for S1 and S2. S3 has a known entry point but an unresolved quantity basis. M30 and M40 remain useful process records, linked to their internal roles. Counting four meters does not establish that all three incoming routes have usable quantity records.
The pack deliberately supplies no meter-counter values and calculates no water total. Its output is the record request: obtain the period-aligned M10 and M20 records; resolve actual delivered quantities for F1; keep M30 and M40 identified separately for a later process review. Vehicle capacity must not silently become delivered volume, and an unresolved S3 quantity must not become zero.
Use the map to test the handover
Try the three failure tests in the worked pages. Remove S3 because it has no meter: the inventory loses a known incoming route. Relabel M30 as a new supply because its screen says “main water”: the retained map contradicts that role. Remove the route evidence: the meter names alone no longer establish which connections enter the boundary.
The handover sheet separates identity confirmation from quantity readiness. For each route, record the available evidence period, gaps, units, proposed extraction reference and remaining decision. Identifying a meter does not confirm that its readings cover the period, that it worked accurately or that the extracted quantity is suitable for a report.
Retain a reference to existing verification or maintenance evidence where relevant, with its scope and date. Do not replace an absent record with an assumed calibration status. Questions about meter suitability, access, installation, testing, operation or water quality belong with the authorised technical personnel and their own procedures.
A later change to the source, pipe arrangement, delivery point, meter or selected premises boundary needs a dated revision. Preserve the earlier inventory and explain which routes or measurement roles changed. This prevents an updated map from silently rewriting the context of old readings.
Keep inventory and calculation work separate
Use the water-balance guide when compatible quantities, storage observations and outgoing routes are ready for reconciliation. Use the water-metric guide when translating records into a defined withdrawal, consumption or discharge measure. This inventory is an input to that work; it does not select a reporting method or assign a residual to leakage.
The shared-property evidence guide helps when an invoice account or common service point does not identify an individual building’s quantity. Keep those allocation questions beside the relevant route, with their owner. A completed inventory does not grant access to private source records or authorise their release.
Source checked 15 October 2026: US EPA, WaterSense at Work, Section 2.1 Metering and Submetering, November 2023, Overview, printed page 1.
Version 1.0. Original Nitium Advisory forms, diagram and fictional case. This records-preparation aid provides no engineering instruction, permit assessment, water-quality conclusion, completeness certification or independent assurance. No source organisation endorses it.
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