GST Exemption for Treated Water Sold by Effluent Treatment Plants
The Tamil Nadu Authority for Advance Ruling confirmed that treated water supplied by effluent plants for industrial reuse is exempt from GST.
- Ruling
- Advance Ruling No. 30/AAR/2023 Dated: 30.08.2023
- 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 for the GST classification of treated effluent water.
- The Authority classified the water under Heading 2201.
- The supply of this treated water attracts a Nil rate of GST.
In short
A company that treats industrial waste water asked if the water they sell back to factories for reuse is taxable under the Goods and Services Tax (GST). The Authority for Advance Ruling (AAR) looked at whether this treated water counts as 'purified' or 'demineralized' water, which would normally be taxed. They decided it is ordinary water meant for industrial use and is therefore exempt from tax.
What has changed
How it worked before
Businesses were uncertain if treated effluent water should be taxed as purified water or if it qualified for the same exemptions as treated sewage water.
What has changed
The ruling confirms that treated water from effluent plants is exempt from GST under Notification No. 2/2017. This means businesses in this sector do not need to charge GST when selling this water back to member units for industrial reuse.
Who this affects
Common Effluent Treatment Plants (CETPs) and businesses that treat industrial waste water for reuse.
An example
A textile park operates a plant that cleans waste water from member factories. They want to know if they must charge GST when selling the cleaned water back to the factories. Based on this ruling, they can argue that their water is not 'purified' in a way that triggers tax and should be exempt. They should document their treatment process to show it aligns with the standards discussed in this ruling.
What you should do
If you operate a similar plant, you may use this ruling as a reference for your tax position. However, remember that an Advance Ruling only legally binds the company that asked and its specific tax officer. You should consult with your tax advisor to see if your specific treatment process matches the criteria used in this decision.
If you do nothing
If you assume this ruling applies to you and stop charging GST without confirming your process is identical, you risk a tax demand later. If a tax officer disagrees with your classification, you may be liable for the unpaid GST, interest, and potential penalties. Always verify your specific situation with a professional rather than applying a ruling to your business by default.
The terms explained
- Heading 2201
- A specific category in the GST tariff schedule that covers water, including natural or artificial mineral waters and aerated waters.
- Zero Liquid Discharge (ZLD)
- A water treatment process where all waste water is purified and recycled, leaving no liquid waste to be discharged into the environment.
- Advance Ruling
- A written decision provided by tax authorities to a business to clarify how GST laws apply to their specific proposed transaction.
The ruling in detail
Authority for Advance Ruling
Eastern Common Effluent Treatment Company Private Limited
Advance Ruling No. 30/AAR/2023 Dated: 30.08.2023 · Tamil Nadu
Questions before the authority
- What is the appropriate classification of the treated water that would be sold by the Applicant, after carrying out various treatment process on the effluent water purchased by them?
- What is the rate of GST applicable on the said treated water which would be sold by the Applicant?
Facts
The applicant operates a Zero Liquid Discharge (ZLD) plant that treats effluents received from member dyeing units to recover water and other solids. They proposed to purchase raw effluent from member units, treat it, and sell the resulting treated water back to the member units for industrial reuse. The applicant sought a ruling on the classification and GST rate applicable to this treated water.
Ruling
| Question | What the authority ruled |
|---|---|
| Classification of treated water | Heading 2201 Specifically under the description: Water (other than aerated, mineral, distilled, medicinal, ionic, battery, de-mineralized and water sold in sealed container) |
| Applicable GST rate | Nil Eligible for exemption as per Notification No. 2/2017-Central Tax (Rate) as amended |
The Authority ruled that the treated water is classifiable under Heading 2201 and is eligible for an exemption from GST. It concluded that the water is not demineralized or purified in a way that would exclude it from the exemption provided under the relevant notification. Consequently, the supply of this treated water attracts a Nil rate of GST.
Reasoning
The Authority determined that the treated water is ordinary water suitable for industrial reuse and does not possess the special characteristics of demineralized or purified water. It relied on the interpretation that the water falls under the exemption provided by **Sl. No. 99 of Notification No. 2/2017-Central Tax (Rate)**. The ruling also drew an analogy from Circular No. 179/11/2022, which clarifies that treated sewage water is exempt from GST. The Authority concluded that the applicant's process is intended to comply with environmental regulations rather than to manufacture water for commercial sale.
Provisions relied on
- Section 98(4) of the CGST Act, 2017
- Section 97(2) of the CGST Act, 2017
- Notification No. 2/2017-Central Tax (Rate) dated 28.06.2017
- Notification No. 7/2022-Central Tax (Rate) dated 13.07.2022
- Circular No. 179/11/2022 dated 03.08.2022
For the practitioner
This ruling provides clarity for common effluent treatment plants (CETPs) that the treated water they supply for industrial reuse is **exempt from GST**. It helps practitioners argue that such water does not qualify as 'purified' or 'demineralized' water subject to higher tax rates. However, it does not apply to water that has been processed to a higher standard of purity for specialized uses.
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/30_eastern_cetp.pdf
Legibility of the scan, as read: high.
Prepared 16-10-2026.
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