Yes, rainwater collection is legal in Singapore but tightly controlled under public health and water resource statutes. The Public Utilities Board (PUB) permits non-potable use only, with strict adherence to the Environmental Public Health Act and Water Supply (Water Fittings) Regulations. From 2026, new developments must integrate sustainable drainage systems, aligning with Singapore’s Green Plan 2030.
Key Regulations for Rainwater Collection in Singapore
- Public Utilities Board (PUB) Guidelines: Collection systems must prevent cross-connections with potable water supplies to avoid contamination under the Water Supply (Water Fittings) Regulations. Unauthorized potable use risks fines up to S$10,000 or imprisonment.
- Environmental Public Health Act: Stored rainwater must be treated if used for non-potable purposes (e.g., irrigation, toilet flushing) to comply with NEA’s hygiene standards. Stagnant water storage without filtration violates Section 29 of the Act.
- Building and Construction Authority (BCA) Requirements: From 2026, all new residential and commercial projects must include rainwater harvesting systems meeting BCA’s Green Mark criteria, with mandatory third-party certification for system integrity.
Non-compliance triggers enforcement by PUB, NEA, or BCA, including system dismantling orders or legal action. Private residential properties may collect rainwater for gardening without permits if systems are below 5,000 liters and non-potable. Commercial entities require PUB approval for larger-scale operations, with water quality testing mandated quarterly.