RTI for TNPCB — Tamil Nadu Pollution Control Board: Factory Consents, Water Quality and Complaints

The Tamil Nadu Pollution Control Board (TNPCB) is the state regulatory authority responsible for preventing and controlling water and air pollution across all 38 districts of Tamil Nadu. Established in 1982 under the Water (Prevention and Control of Pollution) Act, 1974, TNPCB administers a comprehensive framework of environmental statutes: the Water Act 1974, the Air (Prevention and Control of Pollution) Act 1981, the Environment (Protection) Act 1986, and a growing body of delegated rules covering hazardous waste, e-waste, plastic waste, and biomedical waste. TNPCB is headquartered at 76, Mount Salai (Anna Salai), Guindy, Chennai – 600 032, and maintains district offices across the state — it is a public authority under Section 2(h) of the Right to Information Act, 2005, and every citizen has a statutory right to access records held by it.

Tamil Nadu's industrial landscape is diverse and densely concentrated: tanneries in Vellore and Ranipet, petrochemicals and refineries in Ennore–Manali (north Chennai), textiles and dyeing units in Tiruppur and Erode, software and electronics manufacturing in Hosur and Sriperumbudur, chemical and pharmaceutical clusters in Cuddalore SIPCOT, and the (now shut) copper smelter at Thoothukudi. Each of these sectors generates effluents and emissions that TNPCB is mandated to regulate. When industries violate pollution norms, when rivers are contaminated, or when pollution complaints go unanswered, RTI is one of the most effective tools available to citizens, journalists, and environmental advocates to obtain the documented evidence they need.

The Consent Framework: CTE and CTO

Every industry that discharges trade effluent into a water body or emits pollutants into the atmosphere must obtain two distinct consents from TNPCB before it can lawfully operate.

Consent to Establish (CTE) must be obtained before construction of the factory or installation of plant and machinery begins. TNPCB assesses the proposed pollution load, the effluent and emission treatment plan, and the location of the unit relative to sensitive water bodies, residential areas, and ecologically sensitive zones. CTE approval imposes conditions — on the design of the effluent treatment plant (ETP), stack height, location of monitoring points — that must be built into the facility.

Consent to Operate (CTO) must be obtained before commercial production commences. TNPCB inspects the completed facility and verifies that the installed pollution control equipment meets prescribed standards before granting CTO. CTO is time-limited — typically valid for one to five years — and must be renewed periodically. Operating without a valid CTO is a cognisable offence under Section 25/26 of the Water Act and Section 21/22 of the Air Act, and can attract prosecution, stoppage of power supply, and sealing of the unit.

Through RTI, citizens can obtain certified copies of the CTE and CTO issued to any specific unit, including all conditions attached — the authorised daily effluent discharge quantum (in KLD), the prescribed quality parameters and limits, the required frequency of internal monitoring, and any special conditions such as connection to a CETP or installation of an online effluent monitoring system (OEMS). This information is invaluable for verifying whether a nearby factory is legally operating and, if so, under what conditions.

Major Pollution Issues in Tamil Nadu

Palar River and the Tannery Cluster (Vellore and Ranipet)

The Palar river basin in Vellore and Ranipet districts is home to Asia's largest tannery cluster, with thousands of units engaged in chrome tanning — a process that uses chromium sulphate and generates effluent containing hexavalent chromium (Cr VI), a known human carcinogen. Decades of inadequate treatment and disposal have resulted in severe chromium contamination of the Palar riverbed, floodplain soils, and groundwater in riverside villages. Wells and borewells within several kilometres of the tannery belt have been rendered unfit for drinking and irrigation.

TNPCB has established multiple Common Effluent Treatment Plants (CETPs) in this cluster — at Ranipet, Vellore, Ambur, Vaniyambadi, and elsewhere — to aggregate tannery effluent and treat it before discharge. The effectiveness of these CETPs is measured by TNPCB through periodic inspections and effluent quality testing; inspection reports showing whether CETPs are meeting prescribed discharge standards for chromium, BOD, and COD are obtainable through RTI. TNPCB has issued numerous closure orders against non-compliant tanneries in this cluster over the years; the enforcement history, including which units received closure orders and which continue to operate, can be traced through RTI applications to the Ranipet and Vellore district offices.

Cooum, Adyar, and Buckingham Canal in Chennai

The Cooum river and Adyar river, which flow through Chennai to the Bay of Bengal, receive a combination of domestic sewage and industrial effluent discharges from industries located in the Ambattur, Manali, and SIPCOT industrial corridors. TNPCB monitors water quality at several points on both rivers and issues show-cause notices to industries found discharging without valid consent or in excess of permitted limits. The Buckingham Canal, running along the Chennai coastline, has historically received effluents from dyeing and electroplating units. RTI applications to the Chennai or TNPCB head office can surface water quality monitoring data for these rivers, inspection records for specific industrial units along their banks, and directions issued to municipal authorities for sewage treatment plant (STP) compliance.

Ennore–Manali Petrochemical Belt

The Ennore–Manali corridor in north Chennai is one of the most industrially dense zones in South India, hosting oil refineries, fertiliser plants, thermal power stations, port-based industries, and chemical manufacturers. Ambient air quality in this corridor has long been a concern for residents of Manali, Thiruvottiyur, and Ennore (Sathangadu). TNPCB operates Ambient Air Quality Monitoring Stations (AAQMS) at several locations in Chennai including industrial sites; the PM10, PM2.5, SO₂, and NO₂ data from these stations is disclosable under RTI. Inspection reports for specific plants in this corridor — including emission compliance data from stack monitoring — can also be obtained.

Thoothukudi and the Sterlite Controversy

The Sterlite copper smelter at Thoothukudi (operated by Vedanta), one of India's largest copper producers, became the centre of a major public controversy over alleged air pollution affecting nearby residents. Following mass protests in May 2018 during which thirteen demonstrators were killed in police firing, TNPCB issued a permanent closure order against the plant, citing multiple environmental violations. The plant has remained shut since then, and the matter has been contested in the Madras High Court and the Supreme Court. RTI applications to TNPCB can surface the inspection reports and show-cause notices that preceded the closure order, the environmental violations documented by TNPCB, and the current enforcement status.

Cauvery River and Agricultural–Industrial Runoff

The Cauvery river, which traverses Tamil Nadu from west to east before draining into the Bay of Bengal, faces pollution from industrial units located along its banks — including distilleries, sugar mills, textile units, and pharmaceutical manufacturers — as well as from agricultural runoff containing pesticides and fertilisers. TNPCB monitors Cauvery water quality at multiple locations, and this data is accessible through RTI.

SIPCOT Industrial Estates

SIPCOT estates at Cuddalore, Gummidipoondi, Ranipet, Hosur, Perundurai, and Sriperumbudur concentrate significant industrial activity. TNPCB regulates all industries within SIPCOT estates and the district environmental engineer's office for the relevant district maintains inspection records, consent compliance data, and pollution complaint registers for these estates. Citizens and residents near SIPCOT estates can use RTI to obtain environmental monitoring data for the estate perimeter and surrounding water bodies, the CTO compliance status of specific units, and the action taken on complaints submitted to the district office.

What RTI Can Obtain from TNPCB

The RTI Act, 2005, entitles citizens to certified copies of records held by a public authority. For TNPCB, the following categories of records are commonly sought and disclosable:

• CTE and CTO orders: Certified copies of consent orders issued to a specific industrial unit, including all conditions, the authorised pollution load, and any special conditions imposed at renewal
• Inspection reports: Field inspection reports prepared by TNPCB officers following routine inspections or complaint-based inspections of a specific unit
• Show-cause notices and closure orders: Notices issued to non-compliant units, the violations cited, the unit's response, and whether a closure or power-disconnection direction was issued and enforced
• Pollution complaint action-taken reports (ATRs): The outcome of TNPCB's investigation of a specific complaint, including the inspection date, findings, and any action taken
• River water quality monitoring data: Parameter-wise test results recorded at TNPCB monitoring stations on specific rivers or water bodies for a defined period
• CETP inspection reports: Reports on influent and effluent quality at Common Effluent Treatment Plants, compliance with discharge standards, and any notices or closure orders issued to CETPs
• Annual environmental statements: Copies of the annual environmental statements submitted by industries to TNPCB under the Environment (Protection) Act
• AAQMS data: Ambient air quality monitoring data from TNPCB monitoring stations in major cities and industrial corridors
• Online effluent monitoring system (OEMS) data: For industries required to install real-time effluent monitoring systems, TNPCB holds this data and it is disclosable under RTI

How to File RTI with TNPCB

Step 1: Identify the Correct SPIO

TNPCB has a two-tier structure for RTI purposes. For information about a specific industrial unit, pollution complaint, inspection, or local water body within a particular district, address your RTI to the CPIO, District Environmental Engineer, TNPCB, District District Office. For state-level policy information, CETP compliance data, or information about the TNPCB head office functions, address the CPIO, Member Secretary, TNPCB, 76, Mount Salai (Anna Salai), Guindy, Chennai – 600 032. Filing at the correct district office — matched to the location of the industrial unit or water body about which you seek information — ensures the fastest response.

Step 2: Draft Specific, Referenced Queries

Use the sample application above as your base. Identify the unit by its full name and address; if you know the TNPCB consent reference number, include it. For water quality data, specify the river name, the monitoring stations (if known), and the time period. For CETPs, name the specific CETP. Numbered, specific queries receive faster and more complete responses than open-ended requests for "all documents relating to pollution."

Step 3: File via the Tamil Nadu RTI Portal or in Person

TNPCB is a Tamil Nadu state public authority. Applications may be filed online through the Tamil Nadu state RTI portal at rti.tn.gov.in. Alternatively, submit a physical application by registered post or in person to the CPIO at the relevant TNPCB district office or the head office at Guindy. The application fee of ₹10 may be paid through the portal's online payment gateway or, for physical applications, by Indian Postal Order or demand draft in favour of "Tamil Nadu Pollution Control Board." Citizens holding a valid BPL ration card are exempt from the fee; attach a copy of the BPL card with the application.

Step 4: Track Your Response Deadline

The CPIO must respond within 30 days of receipt under Section 7(1) of the RTI Act, 2005. If your request relates to life or liberty — for example, ongoing contamination of drinking water sources used by a village community — the deadline is 48 hours under the Section 7(1) proviso. Retain your application acknowledgement or registered post tracking number as proof of the filing date.

Step 5: Use the Appeal Process if Needed

If TNPCB does not respond within 30 days, or provides an incomplete or evasive reply:

• First Appeal under Section 19(1): File with the First Appellate Authority (FAA) designated within TNPCB within 30 days of the date of the CPIO's decision or expiry of the 30-day response period, whichever is applicable. No fee is required for the First Appeal.
• Second Appeal under Section 19(3): If the FAA's response is also unsatisfactory, file with the Tamil Nadu Information Commission (TNIC) within 90 days of the FAA's decision or the expiry of the FAA's response period. The TNIC is the state information commission constituted under Section 15 of the RTI Act for Tamil Nadu. The Central Information Commission (CIC) has no jurisdiction over TNPCB or any other Tamil Nadu state body. The TNIC can direct TNPCB to furnish the information and impose a penalty of up to ₹25,000 on the CPIO personally under Section 20 of the RTI Act.

Practical Tips for an Effective TNPCB RTI Application

1. Name the industrial unit and provide its address or consent number. TNPCB regulates thousands of industries across Tamil Nadu. An RTI without a specific unit name, address, or consent number is likely to receive a response that the information cannot be identified. The more precisely you identify the subject, the more specific the response.
2. Ask for certified copies of specific documents — not for TNPCB's opinion. Request certified copies of the inspection report, consent order, or show-cause notice rather than asking TNPCB to "explain" whether the unit is polluting. Certified copies of official documents are admissible as evidence before the NGT, the Madras High Court, the NHRC, or a civil court.
3. Specify the time period for monitoring data. River water quality data and AAQMS data are generated continuously; a request without a defined time window (e.g., "April 2024 to March 2025") is difficult to process and can result in a partial or incomplete reply.
4. Use RTI to build the evidentiary record before filing before the NGT. The National Green Tribunal has the power to direct remedial action and award compensation to affected parties. However, to succeed before the NGT you need documented evidence — inspection reports, water quality data, non-enforcement of closure orders. RTI is the most reliable way to obtain these documents from TNPCB before filing a petition.
5. For tannery or CETP complaints, request both the unit-level and CETP-level records. Individual tanneries discharge to CETPs; the CETP then discharges (treated) effluent to the river. A comprehensive RTI should seek both the CTO compliance records of individual tanneries and the CETP inspection reports, because both levels of the treatment chain are regulated by TNPCB.
6. For air quality complaints near industrial estates, cite NAAQS. The National Ambient Air Quality Standards (NAAQS) notified by the Ministry of Environment, Forest and Climate Change are the benchmark against which TNPCB measures ambient air quality. Referencing NAAQS in your RTI — asking for data compared against the prescribed limits — signals that you understand the regulatory framework and often prompts a more precise, parameter-by-parameter response.