ISO 16075-3:2021

Overview

ISO 16075-3:2021 - Guidelines for treated wastewater use for irrigation projects (Part 3) provides guidance on the components of treated wastewater (TWW) reuse systems for irrigation. Published by ISO in 2021 (second edition), the standard focuses on system elements needed to reliably supply reclaimed water for agricultural, landscape and garden irrigation. It emphasizes drip (micro‑irrigation) as an efficient water‑saving method while also covering widely used open irrigation systems. This document is a guidance standard and not intended for certification.

Key topics and requirements

The standard addresses technical and operational aspects of TWW reuse projects, including:

• System components: pumping stations, storage reservoirs, treatment facilities (for irrigation), filtration and disinfection, distribution pipeline networks, and water application devices.
• Irrigation methods: design and maintenance considerations for drip/micro‑irrigation, sprinklers and other pressurized systems, including filtration and automation needs.
• Water quality considerations: emphasis on fit‑to‑purpose quality (pathogens, salinity, sodicity, specific ions, nutrients) and compatibility with soil and crop sensitivity.
• Filtration & disinfection: guidance on additional treatment, chlorine/hydrogen peroxide injection, acid use, and filtration sizing to protect emitters and crops.
• Distribution network design: pipeline materials, valves, blowoffs, flowmeters, hydrants, painting/marking, and strategies to avoid cross‑connections with potable systems.
• Operation & maintenance: monitoring, preventive treatments, flushing, sampling of drip pipes, and measures to prevent bacterial regrowth and protect groundwater/drinking water sources.
• Annexes: practical guidance on chemical injection, sampling, flushing and appropriate chemicals for drip systems.

Applications and who uses it

ISO 16075-3:2021 is practical for professionals and organizations involved in water reuse and irrigation:

• Water utilities and wastewater treatment operators planning reuse schemes
• Irrigation and civil engineers designing distribution and application systems
• Landscape architects and agricultural advisors integrating TWW into crop/landscape irrigation
• Environmental and public health regulators setting operational guidance and protective measures
• Consultants, contractors and asset managers responsible for operation, monitoring and maintenance

Typical uses include design of TWW pumping/storage/treatment systems, specification of filtration and disinfection for drip irrigation, development of operation & maintenance plans, and risk mitigation to protect soils, crops and water resources.

Related standards

• Part of the ISO 16075 series on treated wastewater reuse; consult other parts for policy, risk assessment and monitoring.
• Developed by ISO/TC 282 (Water reuse) - useful reference for broader water‑reuse guidance and fit‑to‑purpose planning.