GST Classification of Treated Water from Effluent Plants
The Authority for Advance Ruling confirmed that treated water sold by effluent plants qualifies as a tax-exempt sale of goods.
- Ruling
- Advance Ruling No. 20/AAR/2023 Dated: 19.06.2023
- Authority
- Authority for Advance Ruling
This page was written by Patron Accounting’s AI from the official release and reviewed before publishing. It explains the document in plain language. It is not the document itself. Where this page and the original differ, the original governs.
The short version
- The company asked if selling treated water is a sale of goods.
- The authority confirmed it is a sale if ownership title transfers.
- Treated water is classified under heading 2201 with a Nil tax rate.
- The water is exempt under Notification No. 2/2017-Central Tax (Rate).
In short
Mannaral Common Effluent plant Pvt Ltd asked the Authority for Advance Ruling (AAR) in Tamil Nadu how to classify the treated water they sell to member units. They wanted to know if this transaction counts as a sale of goods rather than a service, and if the water qualifies for a tax exemption.
What has changed
How it worked before
Businesses in this sector were often unsure if their water treatment process should be taxed as a service or as a sale of goods, leading to confusion over applicable tax rates.
What has changed
The authority ruled that the transaction is a sale of goods, provided there is a formal contract to transfer ownership for money. Furthermore, the treated water is exempt from GST under the Nil rate category, as it is not considered de-mineralized water.
Who this affects
Operators of Common Effluent Treatment Plants (CETPs) who process and sell treated water back to member units.
An example
A textile processing cluster operates a water treatment plant. They ask their tax consultant if they should charge GST on the water they sell back to the factories. Based on this ruling, if they have a clear sales agreement, they can classify the water as a Nil-rated sale of goods.
What you should do
If you operate a similar plant, review your sales contracts to ensure they meet the legal definition of a sale of goods. Remember that an advance ruling only binds the company that asked and its specific tax office; it is not a law that automatically applies to your business.
If you do nothing
If you assume this ruling applies to you and stop charging tax without a formal legal opinion, your local tax officer may disagree with your classification. You could face demands for unpaid GST, interest, and penalties if your specific operations do not perfectly match the conditions set out in this ruling.
The terms explained
- Sale of goods
- A transaction where the ownership of an item is transferred from one party to another in exchange for money.
- Zero Liquid Discharge
- A water treatment process where all wastewater is purified and recycled, leaving no liquid waste to be discharged into the environment.
- Nil rate of tax
- A tax rate of zero percent, meaning no GST is collected on the supply of the specific goods or services.
The ruling in detail
Authority for Advance Ruling
M/s. Mannarai Common Effluent Treatment Plant Private Limited
Advance Ruling No. 20/AAR/2023 Dated: 19.06.2023 · Tamil Nadu
Questions before the authority
- Whether the classification of supply of outputs as sale of goods is correct.
- Whether the classification of water sold as 'water including natural or artificial mineral waters and aerated waters, not containing added sugar or sweetening matter, not flavoured (other than drinking water packed in 20 litre bottles) under heading 2201 is correct.
Facts
The applicant operates a Zero Liquid Discharge plant to treat effluents from member dyeing units. They propose to purchase raw effluent from these units, process it, and sell the resulting products, including treated water and brine solution, to the member units. The applicant seeks to classify these transactions as a sale of goods rather than a service.
Ruling
| Question | What the authority ruled |
|---|---|
| Classification of output as sale of goods | Correct, subject to the condition that the applicant follows the guidelines mentioned in para 4.9 of the order. Must satisfy the elements of a contract of sale under the Sale of Goods Act, 1930. |
| Classification of treated water under heading 2201 | Correct, classifiable under heading 2201 with a Nil rate of tax. As per Sl. No. 99 of Notification No. 2/2017-Central Tax (Rate). |
The authority ruled that the classification of the output as a sale of goods is correct, provided the applicant adheres to the legal requirements of a sale. Regarding the treated water, the authority held that it is correctly classifiable under heading 2201 and is eligible for a Nil rate of tax.
Reasoning
The authority determined that the transaction constitutes a sale of goods if it meets the requirements of the Sale of Goods Act, 1930, specifically involving an agreement to transfer title for money consideration. Regarding the treated water, the authority analyzed the nature of the effluent treatment process and concluded it does not produce de-mineralized water. Instead, it produces ordinary treated water, which falls under the exemption provided by **Sl. No. 99 of Notification No. 2/2017-Central Tax (Rate)**. The authority relied on the definition of sale under Section 4 of the Sale of Goods Act, 1930, and the clarification provided in Circular No. 179/11/2022 regarding treated sewage water.
Provisions relied on
- Section 97(2)(g) of the CGST Act, 2017
- Section 4 of the Sale of Goods Act, 1930
- Notification No. 2/2017-Central Tax (Rate)
- Circular No. 179/11/2022
For the practitioner
This ruling helps common effluent treatment plants (CETPs) structure their operations as a **sale of goods** to benefit from the **Nil rate of tax** on treated water. It clarifies that treated water from such plants is not 'de-mineralized water' and thus qualifies for the exemption under Notification No. 2/2017. Practitioners should note that the 'sale of goods' classification is strictly conditional upon the applicant maintaining a formal contract of sale as defined by law.
Source
This is a summary prepared from the published order, which is a scanned document. It is a reading aid and not the authority: where the two differ, the order governs. Verify every provision against the original before relying on it.
Original order: https://www.gstcouncil.gov.in/sites/default/files/AAR/20_aar_2023mannarai_cetp.pdf
Legibility of the scan, as read: high.
Prepared 20-10-2026.
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