Around Coimbatore, water often decides whether a plot or farm is a good buy. For an individual house, drilling a borewell for domestic use generally does not need a central groundwater no-objection certificate, but local permissions, safety rules and rainwater harvesting requirements still apply, and apartments, businesses and industries face tighter controls. Beyond the rules, the practical question is whether the land has reliable, good-quality water. This guide covers both, so you can check water before you commit.
Key takeaways
- Under the Central Ground Water Authority’s national guidelines, individual domestic users and agriculture are generally exempt from a groundwater NOC.
- Group housing, commercial and industrial users drawing groundwater above set thresholds need permission.
- Rainwater harvesting must be shown on building plans in Tamil Nadu.
- Open or abandoned borewells must be properly capped; local bodies can require permission before drilling.
- Check yield, depth, water quality and alternative supply before buying, especially for farm land.
Who regulates groundwater
Groundwater extraction in India is regulated at two levels. The Central Ground Water Authority (CGWA) issues national guidelines and no-objection certificates for groundwater withdrawal, and states have their own groundwater departments and, in some cases, their own laws. In Tamil Nadu, the Water Resources Department’s groundwater wing monitors aquifers and advises on permissions, while Chennai’s metropolitan area has its own groundwater regulation act. Local bodies (corporations, municipalities and panchayats) control drilling safety and building approvals.
Do you need permission for a borewell?
| User | Groundwater NOC (national guidelines) | Other points |
|---|---|---|
| Individual house for drinking and domestic use | Generally exempt | Local body rules on drilling and safety; rainwater harvesting in the building plan |
| Agriculture | Generally exempt | Free farm power connections have their own EB procedures |
| Apartments and group housing | Needed above the threshold volume | Builders should disclose water source and permissions |
| Commercial users (hotels, hospitals, offices) | Usually needed | Check the current CGWA guidelines and state requirements |
| Industries and packaged water units | Needed, with conditions | Metering, recharge and reporting obligations |
Thresholds and conditions change, so check the current CGWA guidelines and ask the Water Resources Department’s groundwater office in Coimbatore before relying on an exemption for anything beyond a single home or a farm.
Drilling safely and legally
- Local permission: in many areas the local body expects to be informed, or to give permission, before a borewell is drilled. Ask the corporation, municipality or panchayat office.
- Registered drilling agency: use an established agency and get a written record of depth, casing and yield.
- Capping and abandonment: an unused or failed borewell must be properly filled or securely capped. Open borewells have caused tragic accidents in Tamil Nadu, and authorities act against owners who leave them open.
- Distance from septic tanks and neighbours’ wells, to protect water quality.
Rainwater harvesting is part of the rules
Tamil Nadu has made rainwater harvesting part of building approval, and the Tamil Nadu Combined Development and Building Rules, 2019 require site plans to show rainwater harvesting arrangements as specified by the authority. Around Coimbatore, where many areas depend on groundwater for part of the year, a working recharge pit or well does real good. Ask for it to be built properly, not just drawn on the plan. See our guide to the TN building rules.
Practical checks before you buy
For a house plot or independent home
- Ask about piped supply. Within Coimbatore Corporation and many municipalities, piped water is the main source. Confirm whether the street has a connection and how regular supply is.
- Talk to neighbours about borewell depths, how yields change in summer and whether tankers are needed.
- For an existing borewell, ask for drilling records, check the motor and pipes, and run the pump to see the flow.
- Test water quality at an accredited lab: TDS, hardness, fluoride, nitrate and bacteria.
For farm land
- Check existing wells and borewells, their depth and the season’s water level.
- Check the power connection for the pump and whether it is transferable.
- Check canal or tank access where relevant, and the land’s history of cropping.
- Look for recharge features such as check dams or farm ponds nearby.
Our farm land investment guide covers the other checks for agricultural land.
For apartments and gated communities
- Ask the builder for the water source plan: municipal connection, borewells, tanker contracts and storage capacity.
- Ask whether groundwater permission was obtained where required.
- Check for a sewage treatment plant and recycling of treated water for flushing and landscaping in larger projects.
Water and property value
Buyers in Coimbatore increasingly ask about water before price. A home with piped supply, a reliable borewell and proper rainwater harvesting is easier to live in and easier to sell. When you compare areas, add water to your checklist alongside roads and schools. Browse independent houses and villas or agricultural land and ask us what we know about water in each locality.
Frequently asked questions
Do I need permission to drill a borewell for my house in Coimbatore?
A central groundwater NOC is generally not needed for individual domestic use, but check with your local body, which may require intimation or permission and will expect safety rules to be followed.
Is rainwater harvesting mandatory in Tamil Nadu?
Yes, it is part of building approval. TNCDBR 2019 requires site plans to show rainwater harvesting arrangements as specified by the authority.
What should I test in borewell water?
At a minimum: TDS, hardness, fluoride, nitrate and bacteriological quality, at an accredited laboratory.
What do I do with a failed borewell?
Do not leave it open. Fill or securely cap it following local body guidance, using a qualified agency.
This article is general information as of September 2026, not legal, tax or financial advice. Rules and rates change; confirm with a qualified advocate, chartered accountant or the relevant department before you act.
References
- Tamil Nadu Combined Development and Building Rules, 2019
- Sark Engineering: CGWA NOC for borewells explained
Want to know about water in a locality?
Our Coimbatore team can share what we know about water supply in the areas you are considering and help you plan the right checks.
