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Within the water management industry, achieving meticulous accuracy in measurement is paramount. Whether you are a utility company ensuring fair billing, a manufacturer striving for top-performing devices, or a quality control professional, there's a common thread: confidence in your water measurement systems.

This blog dives into a key factor behind that confidence: a curious term called ‘ISO 4064’. We will explore what ISO 4064 is, the benefits of ISO 4064, the ISO 4064 certification process, and much more!

Earth depicted as water droplet splash
In water management, precision is key for utilities, manufacturers, and regulators.

Water Meter Standards: Key to Effective Management

Robust and reliable standards for water meters contribute to effective water management. Standards like ISO 4064 and IS 779 help guide the selection and testing of water meters to guarantee precise and efficient water distribution.

These standards offer detailed criteria for various types of meters and different operating conditions. By following these guidelines, utilities can choose quality meters that support effective water resource management.

This approach promotes fair billing, leak detection, and less water waste. In the end, adhering to water meter standards is essential for achieving optimal water management and conservation.

Recommended Read: How Much Money & Water Can Businesses Save By Installing A Smart Water Meter?

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Robust water meter standards ensure effective management and conservation practices.

What is ISO 4064?

ISO 4064, set by the International Organization for Standardization (ISO), is a multi-part international standard ensuring consistent and accurate performance of water meters for cold potable and hot water.

Here's a breakdown of its five parts:

Part 1: Metrological and Technical Requirements:

This core section defines the technical specifications for water meters. It focuses on accuracy levels (maximum allowed errors at various flow rates), materials used in meter construction, and design features.

Part 2: Installation Requirements and Selection:

This part concentrates on proper installation for optimal performance. It details procedures for installing water meters and guides on selecting the appropriate meter size based on specific applications to ensure accurate readings.

Part 3: Test Methods and Equipment:

Verification of compliance with Part 1 requirements is central to this section. It specifies the tests and equipment used to assess a meter's accuracy under various flow rates, pressure conditions, and environmental factors

Part 4: Non-Metrological Requirements Not Covered in ISO 4064-1:

While Part 1 addresses technical aspects, Part 4 focuses on additional characteristics.

This section covers aspects like the materials used for meter housings, communication protocols for data transmission, and environmental considerations for meter placement.

Part 5: Installation Requirements:

There's a slight inaccuracy here. Part 5 (optional) doesn't solely repeat installation requirements.

It may cover additional specifications or requirements for specific water meter types, such as those designed for hot water applications or large-volume use. Not all ISO 4064 versions include Part 5.

Scope of ISO 4064

ISO 4064 standards outline benchmarks for water meters that measure the volume of cold potable water and hot water in closed, fully charged conduits.

These meters often have devices that display the total water volume used. Here’s an overview of ISO 4064’s scope:

  • Flow Rates: The standard applies to meters designed for a permanent flow rate range, but specific values vary depending on the standard part and meter size.
  • ISO 4064-1 typically covers meters with flow rates from 0.6 m³/h to 4000 m³/h (cubic meters per hour).
  • Accuracy Class: ISO 4064 defines different accuracy classes for water meters, indicating their permissible errors under various flow conditions. Specific accuracy classes and their tolerances are detailed in ISO 4064-1.
  • Temperature Class: The standard establishes different temperature classes for water meters, categorized by their Maximum Allowable Temperature (MAT).
  • Cold Potable Water Meters: The maximum allowable temperature (MAT) is up to 30°C.
  • Hot Water Meters: MAT varies by class, with some classes reaching up to 180°C.
  • Pressure Loss: ISO 4064 specifies maximum allowable pressure losses for meters at various flow rates. This ensures minimal impact on water flow within the system.
  • Maximum Admissible Pressure (MAP): The standard defines the MAP that a meter can withstand continuously. It's typically at least 1 MPa (1 Megapascal), but specific values may vary depending on the meter size and class as defined in ISO 4064-1.

Recommended Read: All You Need To Know About Different Types Of Flow Meters

Equivalent International Standards

ISO 4064 is recognized internationally, but some regions might have slightly adapted versions. Here are some potential equivalents:

OIML R 49:

An International Organization of Legal Metrology (OIML) recommendation that closely aligns with ISO 4064-1, focusing on metrological and technical requirements for water meters.

Regional Standards:

Certain regions may have their own standards based on ISO 4064 but with additional regional specifications. For instance, EN ISO 4064-X is the European standard based on ISO 4064 with potential European-specific requirements.   

Recommended Read: Who Is The Ground Water Authority In Your State?

Keeping Up with ISO 4064 Revisions 

ISO 4064 is an international standard governing water meters, critical for efficient and accurate water distribution and billing.

Its latest revision occurred in 2014 and aligns with OIML R 49, covering both mechanical and electronic water meters for cold and hot water.

Previous versions, including ISO 4064-1:1993, ISO 4064-2:2001, and ISO 4064-3:1999, are still in use by many water utilities for meter specifications and qualifications. 

Indian Standard IS 779:1994 aligns closely with ISO 4064-1:1993, focusing on meters with threaded end connections of up to 50 mm. The standardization ensures uniformity in meter quality and performance across different regions.

Recommended Read: All You Need To Know About Water Measurement Essentials

HVAC pressure gauges, blue for low and red for high
ISO 4064 standardizes water metering for efficient distribution and billing.

Working Conditions Required for ISO 4064

ISO 4064 concentrates on water meter design, performance, testing, and overall management. While it doesn't directly set working conditions, mentions of environmental considerations during testing suggest meters should function within a suitable range.

Specific working conditions like pressure, temperature, and water quality are likely determined by national regulations or utility specifications.

ISO 4064 Certification Process

ISO 4064 serves as a foundational standard rather than a certification program itself.

However, water meter manufacturers often pursue certification against ISO 4064 through accredited bodies to validate their meters' compliance with their specifications.

ISO 4064 Meter Accuracy

ISO 4064 ensures precision in measuring water usage, as defined in Part 3, which outlines performance requirements. Rather than prescribing a fixed ISO 4064 meter accuracy level, the standard sets maximum permissible errors contingent on the flow rate. 

Typically, higher flow rates accommodate slightly larger error margins. This meticulous approach guarantees water meters accurately reflect consumption, which is vital for billing precision and water conservation efforts.

Recommended Read: The Ultimate Guide To Flow Meter Installation For Best Accuracy.

Does Testing ISO 4064 Water Meters Make a Difference?

Testing a water meter according to ISO 4064 at accredited laboratories yields valuable benefits. 

Firstly, it installs confidence in the accuracy, ensuring fair billing for consumers and aiding leak detection to minimize water loss

Secondly, it guarantees performance by assessing durability and ISO 4064 compliance with standards and aligning with regulations. 

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ISO 4064: Ensuring Accuracy, Fairness, and Sustainability in Water Management

The significance of ISO 4064 in the water industry cannot be overstated. Beyond mere compliance, adhering to this standard ensures precise measurement, fair billing, and effective leak detection.

It sets a benchmark for durability and performance, ultimately contributing to efficient water management and conservation efforts. 

Recommended Read: Importance Of Water Conservation For Businesses


Ready to streamline your water management? Integrate Kritsnam's Dhaara Live dashboard services for effortless tracking, alerting, and decision-making. Being an ISO 4064-compliant startup, we ensure CGWA guidelines adherence.  

Dhaara Smart water meter delivers precise, automated readings, complemented by the Dhaara Live dashboard, offering valuable insights for strategic decision-making.

This system enables managers to monitor performance objectively, ensuring alignment with budgetary constraints and sustainability objectives.

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