Tata Chemicals Limited disclosed that NSE Sustainability Ratings and Analytics Limited has assigned it an Environmental, Social, and Governance (ESG) Score of 59 for FY26.

The rating agency received the report on September 2, 2026. Tata Chemicals clarified that it did not engage NSE Sustainability for this assessment.

Independent Assessment

NSE Sustainability prepared the report independently using data pertaining to FY2025-26 available in the public domain. The company made no specific disclosures regarding the methodology or criteria used to derive the score of 59.

Regulatory Compliance

This disclosure is made under Regulation 30 read with Schedule III of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015. It also complies with SEBI Master Circular HO/49/14/14(7)2025-CFD-POD2/I/3762/2026 dated January 30, 2026.

The full intimation is available on the company’s website.

A study by the CSIR-Central Salt & Marine Chemicals Research Institute (CSIR-CSMCRI) has found the marine ecosystem surrounding Tata Chemicals ' effluent discharge point at Mithapur to be healthy, stable, and productive.

The assessment, released in August 2026, examined water quality, sediment quality, marine biology, floral diversity, and avifauna across a 10 km radius of the discharge point in the Gulf of Kutch. Field studies were conducted by experts in December 2025 and May 2026. This is the first report submitted under the ongoing monitoring framework associated with the approval of the treated wastewater discharge pipeline project.

Key Findings

The report indicates that water and sediment quality parameters remain within natural ranges. Seawater quality metrics, including pH, salinity, dissolved oxygen, and biochemical oxygen demand, were found to be within ranges typical of a healthy coastal marine environment.

The area continues to support significant biodiversity:

• Avifauna: 637 birds across 40 species were recorded, including migratory species using the Central Asian Flyway. The sampling station nearest the discharge point recorded the highest bird abundance, including approximately 250 Greater Flamingos.
• Mangroves: Stands dominated by Avicennia marina were found to be healthy, providing shoreline stabilisation and habitat function.
• Plankton: The community comprised 22 phytoplankton and 23 zooplankton species, indicating a balanced and productive marine food web.

What the Numbers Show

The data reveals a divergence between industrial proximity and ecological health. Despite being nearest to the discharge point, the sampling station recorded the highest bird abundance in the entire study area. This suggests that the treated wastewater pipeline transition has allowed local conditions to remain governed predominantly by natural marine and tidal processes rather than industrial impact.

The diversity indices indicate healthy vegetation communities with no evidence of environmental degradation. The findings confirm that decades of industrial operations and treated wastewater management have co-existed with the sensitive coastal environment.

About the Study

CSIR-CSMCRI is a premier national constituent laboratory of the Council of Scientific & Industrial Research (CSIR), Government of India. Based in Bhavnagar, Gujarat, it is an accredited testing laboratory under the National Accreditation Board for Testing and Calibration Laboratories (NABL). It is India's foremost scientific body on marine ecology, salt technologies, and environmental monitoring.

The full executive summary and study report are available on the company's website.