Dam Safety Act, 2021

The Dam Safety Act, 2021 is India's first national law on the safety of dams. It makes every owner of a big dam (a government department, a state, or a company) responsible for checking, maintaining and running the dam safely. It also creates four bodies, two at the national level and two in each state, to watch over dam safety. The aim is simple: prevent dam failures and the floods and deaths they can cause.

Why does India need such a law?

India has one of the largest numbers of large dams in the world, after China and the United States. As per a May 2026 government briefing, there are 6,628 specified dams in India, of which 6,545 are working and 83 are under construction. Many of these dams are old. When a dam fails, a huge wall of water rushes downstream with little warning.

Before 2021, dam safety was handled through guidelines that states could follow or ignore, and there was no legal duty on owners and no penalty for neglect.

Where did it come from?

The worst dam disaster in Indian history was the failure of the Machchhu-II dam at Morbi, Gujarat, on 11 August 1979. After heavy rain, the dam's earthen walls gave way and the town was flooded. Death estimates vary widely, from about 1,800 to as many as 25,000. Over the following decades, dam safety laws were proposed several times.

A Dam Safety Bill was introduced in December 2018 but lapsed when the 16th Lok Sabha was dissolved in 2019. It was introduced again in July 2019 and:

• passed by the Lok Sabha on 2 August 2019;
• passed by the Rajya Sabha on 2 December 2021, with amendments (including changing the year in its name to 2021), so it went back to the Lok Sabha;
• received the President's assent on 13 December 2021 as Act No. 41 of 2021;
• came into force on 30 December 2021.

Which dams does it cover?

The Act applies only to a "specified dam", built before or after the law. A dam is a specified dam if it is:

1. More than 15 metres high (measured from the lowest point of its foundation to its top); or
2. Between 10 and 15 metres high and meets at least one of these conditions: crest length (length along the top) of at least 500 metres; reservoir capacity of at least 1 million cubic metres; maximum flood discharge of at least 2,000 cubic metres per second; specially difficult foundation problems; or an unusual design.

The four bodies under the Act

Think of it like a school: one body writes the rules, another checks that every class follows them.

• National Committee on Dam Safety (NCDS): It makes national policy and standards. It is chaired by the Chairman of the Central Water Commission (CWC), with up to 10 Central government officers (not below Joint Secretary rank), up to 7 state representatives (by rotation) and up to 3 experts. It is reconstituted every three years and must meet twice a year.
• National Dam Safety Authority (NDSA): It is the national regulator that puts the NCDS's policies into practice. It is headed by an officer not below the rank of Additional Secretary to the Government of India, with headquarters in Delhi. It came into being in February 2022.
• State Committee on Dam Safety (SCDS): It is chaired by the state's Engineer-in-Chief (or equivalent) of the dam safety department. It also includes chief engineers of upstream and downstream states when a dam's reservoir or flood releases cross state borders, plus a CWC representative.
• State Dam Safety Organisation (SDSO): It does the hands-on supervision in each state. In states with more than 30 specified dams, it is headed by an officer not below Chief Engineer; in other states, by an officer not below Superintending Engineer.

When does the NDSA act as the state body?

For three kinds of dams, the NDSA itself plays the role of the SDSO:

• dams owned by a Central Public Sector Undertaking (for example, an NHPC dam);
• dams that extend over two or more states;
• dams in one state that are owned by another state.

This matters for a project like SUMP, which would be built by NHPC, a central company.

What must every dam owner do?

The Act puts clear duties on the owner:

• Set up a dam safety unit of engineers for each dam.
• Inspect each dam before and after every monsoon, and also during and after floods, earthquakes or any sign of distress.
• Set up a seismological station (to record earthquakes) near every dam 30 metres or higher, or in seismic zones specified by regulations.
• Run flood forecasting and an emergency flood warning system for people downstream, and share inflow and outflow information with district authorities and the public.
• Prepare an Emergency Action Plan (EAP): a ready plan that says what to do, who to warn and which areas will flood if the dam fails. New dams need it before the reservoir is first filled; existing dams had to prepare it within five years of the Act starting.
• Carry out risk assessment studies and a Comprehensive Dam Safety Evaluation by an independent panel of experts; the first of each for existing dams had to be done within five years of the Act starting.

Penalties

Under Section 41, anyone who obstructs an official or refuses to follow directions under the Act can get up to one year in prison, or a fine, or both. If this leads to loss of life or an immediate danger to life, the jail term can go up to two years.

Where does the Centre get the power?

Water is mainly a state subject under Entry 17 of the State List. But Entry 17 is subject to Entry 56 of the Union List, which lets Parliament regulate inter-state rivers and river valleys when it declares this to be in the public interest. Section 2 of the Act makes such a declaration: it says it is expedient in the public interest for the Union to control a uniform dam safety procedure.

The Centre also relies on Entry 97 of the Union List (the residuary power over matters not in any list), because "dam safety" is not named in any list.

How does it work with money and projects?

The law sets the rules; the money for repairs comes mostly through schemes like the Dam Rehabilitation and Improvement Project (DRIP). DRIP Phases II and III, with an outlay of about ₹10,211 crore, cover 736 dams in 19 states and are funded with help from the World Bank and the Asian Infrastructure Investment Bank (AIIB). They became operational in October 2021.

India's examples

• Mullaperiyar dam (in Kerala, owned and operated by Tamil Nadu) is a long-running safety dispute. In late 2024 and early 2025 its supervisory committee was reconstituted under the chairman of the NDSA, after the Supreme Court questioned why the Act's bodies were not being used.
• In October 2023, a glacial lake outburst flood from South Lhonak lake in Sikkim destroyed the Teesta III dam at Chungthang. This showed that Himalayan dams face risks from glaciers, cloudbursts and earthquakes that ordinary dam designs may not handle.

Commonly confused concepts

• Specified dam vs large dam: "Specified dam" is the Indian legal term from this Act (more than 15 m, or 10 to 15 m with extra conditions). "Large dam" is the international engineering term used by ICOLD (International Commission on Large Dams): at least 15 m high, or 5 to 15 m holding more than 3 million cubic metres.
• NDSA vs NDMA: The NDSA (National Dam Safety Authority) is a technical regulator for dams under the Dam Safety Act, 2021. The NDMA (National Disaster Management Authority) is chaired by the Prime Minister under the Disaster Management Act, 2005 and handles all kinds of disasters. A dam owner's Emergency Action Plan must be prepared in consultation with disaster management agencies.
• NCDS vs NDSA: The NCDS makes policy and standards; the NDSA implements and enforces them.
• CWC vs NDSA: The Central Water Commission is the Centre's main technical body for water resources (floods, irrigation, river data). Its chairman heads the NCDS, but the NDSA is a separate regulator.
• Entry 17 (State List) vs Entry 56 (Union List): Entry 17 gives states power over water in general; Entry 56 lets Parliament regulate inter-state rivers and valleys in the public interest.

Issues, criticism and the way forward

• Federalism concerns: Critics, including some states, argue that dams are a state subject under Entry 17 and that the Act takes away state powers. A petition in the Madras High Court in 2022 challenged the Act on this ground; the Centre replied that the Act does not change the ownership or water rights of states.
• Inter-state dams: Giving the NDSA control over a dam owned by one state but located in another (like Mullaperiyar) can sharpen disputes between states.
• Focus on structure, not people: Critics say the Act focuses on the dam wall and gives little role to downstream communities, independent experts or public hearings on safety.
• Climate and Himalayan risks: Glacial lake floods, cloudbursts and earthquakes are rising risks for dams in the Himalayas. Experts suggest that design floods and seismic safety standards be reviewed for such regions.
• Capacity gaps: Many states lack enough trained engineers and money to meet the deadlines for Emergency Action Plans and safety evaluations.
• Way forward: Fill posts in state dam safety bodies, publish Emergency Action Plans and inundation maps, link dam safety with disaster management plans, and carry out independent safety reviews for very old dams and those in seismic zones.

Concepts to Know

• Reservoir: The large lake that forms behind a dam when water is stored.
• Spillway and flood discharge: A spillway is a channel that lets extra water flow out safely so it does not spill over the dam top. Flood discharge is how much water passes out per second, measured in cubic metres per second (cumecs).
• Seismic zone: An area marked by how likely and how strong earthquakes are. India is divided into zones; the North-East is among the most earthquake-prone.
• Inundation map: A map showing which areas would go under water if a dam fails or releases a big flood.
• Glacial Lake Outburst Flood (GLOF): A sudden flood when the natural wall of ice or loose rock holding a glacial lake breaks.
• Residuary power: The power to make laws on subjects not named in any of the three lists. In India, it lies with Parliament (Article 248 and Entry 97 of the Union List).
• Crest length: The length of the top of the dam, measured from one bank to the other.