The State of Industrial Wastewater in India
Last updated: July 2026
India generates tens of thousands of millions of litres of sewage and industrial effluent every day, yet treats only a fraction of it. This page compiles verifiable statistics — from the Central Pollution Control Board (CPCB), NITI Aayog, the National Mission for Clean Ganga and published market research — on generation, the treatment gap, the regulatory regime, sector effluent profiles, water stress and the treatment market. Every figure below is attributed to its source, listed at the end.
At a Glance
Headline Numbers
The most-cited figures describing the scale of India's wastewater challenge. Sources are noted on each card and linked in the references section.
Generation & Treatment Gap
How much wastewater does India generate — and treat?
According to the CPCB's National Inventory of Sewage Treatment Plants (2021), India's urban centres generate an estimated 72,368 MLD (million litres per day) of sewage. Against this, the installed treatment capacity is only 31,841 MLD, and actual utilisation is lower still at 20,235 MLD — meaning roughly 52,133 MLD of largely untreated sewage is let out into the environment. In other words, only about 28% of the sewage generated is actually treated. CPCB projects urban sewage generation could rise toward 1,20,000 MLD by 2050 as population and water demand grow.
Industrial effluent adds substantially to this load. CPCB data cited in a peer-reviewed 2022 study puts India's industrial wastewater generation at about 13,468 MLD, of which only around 60% is treated. The same study notes that compliance with industrial effluent standards is low — under 35% for individual effluent treatment plants (ETPs) and under 10% for common effluent treatment plants.
A stark illustration is the Ganga basin: the National Mission for Clean Ganga estimates that grossly polluting industries return around 45% of the water they consume as wastewater — much of it from small-scale units without adequate effluent treatment. Understanding these volumes is the starting point for any industrial wastewater treatment strategy.
Regulatory Landscape
CPCB, the consent regime and ZLD mandates
India's effluent regime is administered by the Central Pollution Control Board (CPCB) and State Pollution Control Boards under the Water (Prevention and Control of Pollution) Act and the Environment (Protection) Act. Industries operate under a Consent to Establish and Consent to Operate and are classified into Red, Orange, Green and White categories by pollution potential. CPCB's general discharge standards for inland surface water require pH 5.5–9.0, BOD ≤ 30 mg/L, COD ≤ 250 mg/L, TSS ≤ 100 mg/L and oil & grease ≤ 10 mg/L, with many state boards imposing stricter local limits.
Effluent from clusters of small and medium units is often routed to a shared common effluent treatment plant (CETP). A CPCB assessment (2011–12) recorded 193 CETPs installed across the country serving 212 industrial estates. In 2025 the Ministry of Environment, Forest and Climate Change rationalised the CETP framework — exempting CETPs from prior Environmental Clearance subject to safeguards — acknowledging that current CETP capacity is “significantly below what is required” for expanding industrial clusters.
For the most polluting sectors, CPCB introduced Zero Liquid Discharge (ZLD) guidelines in 2015 covering four industries: textiles, tanneries, distilleries and pulp & paper. The Tirupur textile cluster in Tamil Nadu is the landmark case — following High Court orders, its dyeing and wet-processing units were required to adopt ZLD systems to protect the Noyyal river. On the Ganga, CPCB and NMCG run annual third-party inspections of grossly polluting industries through IITs, NITs and CSIR institutes; a large inspection cycle covered 3,186 GPIs between February and July 2023.
Sector Deep-Dives
Typical effluent characteristics by sector
Effluent strength varies enormously between industries. The ranges below are drawn from published literature and CPCB norms; site-specific values differ with process and raw materials.
| Sector | COD (mg/L) | BOD (mg/L) | Notes |
|---|---|---|---|
| Textile dyeing | 500–10,000 | — | High colour, TDS, alkalinity; ~200 L water per kg of fabric (Indian scenario) |
| Distillery spent wash | 80,000–100,000 | 40,000–50,000 | Dark brown, acidic (pH 4.5–5.0); melanoidins, high organic and inorganic load |
| Pharmaceutical (bulk drug) | ~84,000 | ~36,000 | Highly acidic; chemical-synthesis streams show COD 40,000–60,000 mg/L |
| Dairy / food & beverage | — | 1,500–6,000 | Fats, lactose and milk solids; variable flow (typical industry range) |
Textile, distillery and pharmaceutical ranges compiled from peer-reviewed literature — see references 11–13 below. The dairy / food & beverage range reflects values commonly reported in industry practice.
Why distillery & pharma are hardest
Distillery spent wash (COD up to ~100,000 mg/L) and bulk-drug pharmaceutical effluent (COD ~84,000 mg/L) carry organic loads orders of magnitude above municipal sewage, which is why both sectors face ZLD or near-ZLD expectations. Explore distillery effluent treatment and pharmaceutical wastewater treatment.
Textile: water-intensive and colour-heavy
Indian textile processing consumes roughly 200 L of water per kg of fabric, producing high-TDS, high-colour effluent. Colour and dissolved solids drive the treatment train toward membranes and evaporation. See textile wastewater treatment.
Water Stress & Reuse Outlook
A shrinking margin between demand and supply
NITI Aayog's Composite Water Management Index (first released 2018) found that around 600 million Indians face high-to-extreme water stress, and projected that by 2030 the country's water demand could be twice the available supply. India holds about 18% of the world's population but only around 4% of its freshwater resources.
Treated wastewater is the most immediate untapped resource. Yet of the ~28% of sewage that is treated, only a small share — around 3% by some assessments — is reused beneficially. To close this gap, the National Mission for Clean Ganga published a National Framework on Safe Reuse of Treated Water, which defines institutional roles and business models for scaling up reuse, and several states have notified their own treated-water reuse policies.
For industry, reuse is both a compliance route and an economic one — recovering water through wastewater reuse and reverse osmosis reduces freshwater draw and helps meet ZLD obligations in water-stressed clusters.
Market Size & Investment
A large and fast-growing treatment market
Estimates of India's water and wastewater treatment market vary by scope and methodology, but all point to steady double-digit-adjacent growth. Research and Markets valued the Indian wastewater treatment plants market at US$1.33 billion in 2024, projected to reach US$2.46 billion by 2030 at a 10.6% CAGR. Mordor Intelligence sizes the broader treatment-technology market at about US$3 billion in 2025/26, growing to US$5.17 billion by 2031 (~9.6% CAGR). The US International Trade Administration describes India as the world's 5th-largest water and wastewater treatment market.
Growth is underpinned by public programmes — the Jal Jeevan Mission, AMRUT and the Namami Gange / National Mission for Clean Ganga — alongside tightening enforcement and rising ESG expectations on manufacturers. For companies planning capital projects, our wastewater treatment cost guide sets out indicative ETP, STP and ZLD price ranges, and the knowledge hub covers technology selection in depth.
Sources & References
Where these figures come from
This page cites primary reports and peer-reviewed literature. Links open in a new tab. If you cite this page, a link back to spans.co.in/state-of-industrial-wastewater-india is appreciated.
- 1.CPCB, National Inventory of Sewage Treatment Plants, 2021 — sewage generation (72,368 MLD), installed capacity (31,841 MLD) and utilisation (20,235 MLD). cpcb.nic.in/status-of-stps
- 2.Down To Earth — “India’s sewage treatment plants treat only a third of the sewage generated daily: CPCB.” downtoearth.org.in
- 3.Perceived drivers and barriers in the governance of wastewater treatment and reuse in India (ScienceDirect, 2022) — industrial wastewater generation ~13,468 MLD and ETP/CETP compliance rates. sciencedirect.com
- 4.NITI Aayog, Composite Water Management Index (CWMI) — ~600 million people under water stress; demand twice supply by 2030. niti.gov.in (CWMI report)
- 5.Press Information Bureau, Ministry of Jal Shakti (2021) — “Sewage Water Treatment”; confirms CPCB inventory figures and the projection of sewage generation rising toward 1,20,000 MLD by 2050. pib.gov.in
- 6.CPCB — Status of Common Effluent Treatment Plants (CETPs); 2011–12 assessment recording 193 CETPs serving 212 industrial estates. cpcb.nic.in/status-of-cetps
- 7.PIB / MoEFCC (2025) — “Government Rationalises Regulatory Framework to Accelerate Setting up of Common Effluent Treatment Plants.” pib.gov.in
- 8.PIB / MoEFCC (2024) — “Environmental pollution by factories”; 3,186 GPIs inspected February–July 2023 under the Namami Gange PIAS project. pib.gov.in
- 9.NMCG — Pollution Assessment: Status of Grossly Polluting Industries (GPIs) on the Ganga, including the estimate that GPIs return ~45% of consumed water as wastewater. nmcg.nic.in
- 10.Everything About Water — “Zero Liquid Discharge, Policy Scenario and Indian Textile Industries” (2015 ZLD guidelines for textiles, tanneries, distilleries, pulp & paper; Tirupur cluster). eawater.com
- 11.Mohana, Acharya & Madamwar — “Distillery wastewater: bioremediation approaches” (Journal of Integrative Environmental Sciences) — spent wash COD 80,000–100,000 mg/L, BOD 40,000–50,000 mg/L, pH 4.5–5.0. tandfonline.com
- 12.Rana et al. — “A review on characterization and bioremediation of pharmaceutical industries’ wastewater: an Indian perspective” (Applied Water Science, Springer) — bulk-drug COD ~84,000 mg/L, BOD ~36,000 mg/L; chemical-synthesis COD 40,000–60,000 mg/L. link.springer.com
- 13.“A critical review on textile dye-containing wastewater” (Journal of Hazardous Materials Advances, 2025) — dyeing wastewater COD 500–10,000 mg/L; ~200 L water per kg of fabric in Indian textile manufacturing. sciencedirect.com
- 14.NMCG — National Framework on Safe Reuse of Treated Water (2022), via PIB; sets national direction and reuse targets for treated wastewater. pib.gov.in
- 15.Mongabay India (2023) — India treats ~28% of sewage; only a small share (~3%) of treated water is reused beneficially. india.mongabay.com
- 16.Research and Markets — India Wastewater Treatment Plants Market (US$1.33 bn in 2024 to US$2.46 bn by 2030, 10.6% CAGR). researchandmarkets.com
- 17.Mordor Intelligence — India Water and Wastewater Treatment Technology Market (~US$3 bn in 2025/26 to US$5.17 bn by 2031, ~9.6% CAGR). mordorintelligence.com
- 18.US International Trade Administration — India Water and Wastewater Treatment Industry (India as the world’s 5th-largest water and wastewater treatment market; 18% of world population, ~4% of freshwater resources). trade.gov
Figures are reproduced as reported by their sources and may be revised as newer inventories are published. Market-size estimates differ between research firms owing to differing scope and methodology.
Planning an ETP, STP or ZLD project?
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