Distillery and Sugar Mill Effluent: Rules and Complaints

A distillery is generally not allowed to let spent wash leave its premises at all, and a sugar mill may discharge only treated effluent within the limits written in its consent to operate. So dark brown, sour-smelling water in a village drain, a canal or a river near either kind of unit is usually a breach of the Water Act, not bad luck. Complain in writing to the State Pollution Control Board with dated photos and an RTI on the unit's consent. If the board does nothing while the discharge continues, the National Green Tribunal can order inspection, closure and compensation.

This guide covers what distilleries and sugar mills are allowed to do with their liquid waste, why their effluent does so much damage, how the crushing season changes the picture, and how villagers and residents can complain in a way that gets an inspection rather than a file note. It also has a section for mill and distillery managers who have received a notice.

For the wider legal picture on factory effluent, see our page on industrial water pollution remedies. If your problem is a general factory outlet rather than a sugar or alcohol unit, start with how to complain about untreated industrial effluent.

The essentials

A sugar mill or distillery is releasing black water into our drain. Is that illegal?

Almost always, yes. Under section 25 of the Water Act no industry may discharge trade effluent into a stream, a well, a sewer or onto land without the State Board's consent, and the consent fixes what can be discharged and where. For a distillery, the consent issued in recent years normally says that spent wash, the thick liquid left after alcohol is distilled out, must not be discharged anywhere. It has to be treated and disposed of inside the premises. Black water from a distillery in a public drain therefore points to a breach, not to a permitted outlet.

Sugar mills are a little different. Many are allowed to discharge some treated effluent, or to use it for irrigation on their own or contracted land, but only after it passes through an effluent treatment plant and meets the limits in the consent. Untreated mill water is grey to brown, smells sour within a day and kills fish by stripping oxygen from the water. If you are seeing that, the mill is either running its plant badly, bypassing it, or emptying a storage lagoon it should not be emptying.

Section 24 of the Water Act separately bars anyone from knowingly letting poisonous, noxious or polluting matter enter a stream or well. So even a unit with valid consent is not protected if it lets untreated waste escape.

Why distillery and sugar mill effluent does so much damage

The problem is organic load. Spent wash from a molasses-based distillery is dark brown, acidic and loaded with dissolved organic matter and salts. When it reaches a stream, bacteria break down the organic matter and use up the dissolved oxygen in the process, so fish suffocate within hours. The colour does not fade easily, which is why a single night's discharge can stain a canal for kilometres. On land, repeated dumping raises salt levels in the soil and can seep down to the water table, turning hand-pump water brown or bitter.

Sugar mill effluent is weaker but comes in larger volumes. It carries sugar, fibre, oil and grease from the mill house, and floor and equipment washings. Left in an open drain it ferments, and the smell of rotting sugar settles over a village for days. Mills also produce press mud, the filter cake from juice clarification, and boiler ash from burning bagasse. Press mud dumped on roadsides or in low-lying fields smells, attracts flies and leaches into ponds when it rains.

Grain-based distilleries, which have multiplied with the ethanol blending programme, leave a wet grain residue that is usually dried and sold as cattle feed. They still produce process effluent that needs full treatment.

What each stream looks like and what the rule usually is

The exact conditions are in each unit's consent order. This table shows the usual position, so you know what to ask for in your RTI.

The rules distilleries and sugar mills must follow

Zero liquid discharge at a distillery: what it means on the ground

Zero liquid discharge means no effluent leaves the plant as liquid. A distillery meets it by one of a few routes approved in its consent: concentrating spent wash and burning it in a specially designed boiler, digesting it to make biogas and then composting the residue with press mud, or evaporating and drying it. Process condensate is treated and reused. Whatever the route, the plant has to show that what it produces each day matches what it treats and disposes of each day.

That balance is where most violations hide. If a distillery has expanded its alcohol output but not its incineration or evaporation capacity, spent wash accumulates. Lagoons fill up, and the temptation is to release some at night, during rain, or into a tanker that empties it into a canal far away. Monsoon overflows from compost yards and lagoons are another regular source of complaints. Our guide on zero liquid discharge rules explains how boards test ZLD claims.

For a complainant, the useful questions are simple. How much spent wash does the unit produce per day at its consented capacity? What is the capacity of the system that handles it? How many days of lagoon storage does the consent allow? An RTI for the consent order, the latest inspection report and the unit's monthly returns usually answers all three.

Sugar mills and the crushing season problem

Sugar mills run for a season of a few months each year, starting after the monsoon and continuing as long as cane is available. Their pollution follows the same calendar. Complaints spike in the first weeks of crushing, when the effluent treatment plant has been idle for months and its biological units are not yet working properly, and again at the end, when the whole plant is washed down and the wash water is often sent straight to the nearest drain.

Between seasons, the lagoons where treated or partly treated effluent was stored sit unattended. Some mills empty them into a drain before the next season begins. Others leave them unlined, and the seepage shows up months later in nearby hand pumps. Press mud heaps left through the monsoon add to the problem.

If you live near a mill, keep a simple calendar. Note the day crushing starts and stops, and record the drain and river condition in the first and last fortnight. A complaint that says 'the drain turned black on the third day of crushing and stayed black for two weeks' is far more useful to an inspecting officer than a general grievance filed in summer, when there is nothing to see.

A new ethanol plant is coming up near our village. Can we object?

Yes, and the time to do it is before the plant is built. A new or expanded distillery needs environmental clearance and consent to establish. Where the project is one that requires public consultation, a public hearing is held in the district, and objections raised there go on record. Ask for the draft EIA report, check the water source, the spent wash handling method and the distance to the nearest river, pond and habitation, and file written objections even if you also speak at the hearing.

If clearance has already been granted, an appeal against the grant lies to the NGT under section 16 within 30 days of communication, extendable by up to 60 days for sufficient cause. That deadline is strict, so watch for the clearance being uploaded. Our pages on challenging an environmental clearance and objections at an EIA public hearing go into detail.

Be realistic about what objections achieve. A plant with a sound water plan and a proper ZLD system will usually get clearance. Objections work best when they point to a specific flaw: a wrong distance in the EIA report, a river or wetland left out, groundwater already over-exploited, or a spent wash plan that does not add up.

How to complain about distillery or sugar mill effluent

These steps are for residents, farmers and fishing families. Each one builds the record that the next forum will ask for.

Evidence that works in sugar and distillery cases

What the pollution board usually does, and where it hesitates

A complaint backed by evidence usually leads to an inspection and sampling. If the samples fail or the officer sees a bypass, the board issues a show-cause notice under section 33A of the Water Act and may follow it with a closure direction, disconnection of power, environmental compensation calculated under the CPCB method, or a bank guarantee to secure compliance. Repeat offenders sometimes have their consent refused at renewal.

Be prepared for hesitation during the crushing season. A sugar mill buys cane from thousands of farmers, and shutting it mid-season affects the whole district. Boards therefore tend to prefer compensation and compliance deadlines over closure for mills, at least for a first breach. Distilleries get less sympathy, especially where spent wash has reached a river. In complaints that Advocate B.K. Singh has handled against agro-based units, the record that moved the board fastest was one that tied a specific discharge on a specific date to a sample taken on that date, rather than a general history of grievances.

If the board inspects at a time of the unit's choosing and finds nothing, ask in writing for a surprise inspection during the hours you have recorded.

When the NGT is the right forum

The NGT is the right forum when discharge is continuing or recurring, the board has been told in writing and has not acted effectively, and you have evidence of harm. It can be approached under section 14 for the pollution itself and section 15 for compensation and restoration. The time limit is six months from when the cause of action first arose for section 14 and five years for section 15, each extendable by 60 days for sufficient cause. For effluent that recurs every season, each fresh discharge is a fresh event, which helps with limitation. Read how to file a case in the NGT for the filing steps.

In practice the tribunal often forms a joint committee of the CPCB, the State Board and the District Magistrate to inspect the unit and report. That report becomes the centre of the case, so file objections promptly if it misses the discharge points or the lagoons you have identified. Where fish, crops or wells have been damaged, the tribunal can direct the unit to pay environmental compensation and to restore the affected drain or pond. The court fee is ₹1,000 where no compensation is claimed.

Received a show-cause or closure notice? What to do first

Read the notice for three things: what breach is alleged, what evidence the board relies on, and the time given to reply. Then check your own records before writing anything. When Advocate B.K. Singh reviews a notice issued to a distillery, the first thing he asks for is the daily spent wash balance for the period in question: production, treatment, storage and disposal, side by side. If those numbers do not reconcile, the reply must deal with the gap honestly, because the board's inspection report probably already shows it.

A good reply admits what is true, explains corrective steps with dates, and attaches proof: repair invoices, lagoon lining work, additional evaporation capacity ordered, online monitoring restored. Where the board has got facts wrong, say so with documents. Ask for a personal hearing. If a closure direction has already issued, the remedy is an appeal to the NGT under section 16 within 30 days, or a fresh compliance report seeking revocation. See our page on replying to a closure notice.

Before you complain: a short checklist

Where to go from here

If the discharge goes straight into a river, read industrial discharge into rivers. If your hand-pump or tap water has changed, see drinking water contaminated by industry, and if a factory has received a demand for money, read about environmental compensation demands.