How to Recharge a Dry Borewell: Methods, Cost and Mistakes to Avoid

Most borewells in Delhi NCR do not fail because something broke. They fail because the water they draw from has dropped a little every year until the pump, set at a fixed depth, starts drawing air. Deepening the bore buys a few years. Putting rainwater back into the same layer is what keeps it working.

This post explains why borewells go dry, the three ways to recharge one, what each costs at 2026 rates, and the mistakes we see most often when we are called to fix a recharge system someone else built.

Why your borewell is going dry

Groundwater is a bank account. Rain that soaks into the ground is the deposit; every pump in the area is a withdrawal. When withdrawals run ahead of deposits, the water table falls for everyone, and the shallowest bores fail first.

In much of Haryana the account is heavily overdrawn. The 2025 CGWB assessment puts Gurugram's groundwater at 195% of the extractable resource: the district pumps nearly twice what the monsoon puts back. Sixteen of Haryana's 22 districts are over-exploited, and you can see them on the Haryana dark zone list. Paving makes it worse: rain that used to soak in now runs off roofs and roads into drains.

Signs that your bore is on its way out:

• The pump runs longer to fill the same tank.
• Water turns muddy or sandy after long pumping.
• Output is fine in September and weak by May.
• Your borer says the water level has dropped since the bore was drilled.

Three ways to recharge a borewell

1. A recharge pit with a recharge bore (what we build most)

Roof water is led through a filter into a pit about 2 × 2 × 2.5 m, lined with honeycomb brickwork and filled with boulders, gravel and coarse sand. A 150 mm recharge bore in the floor of the pit, cased with slotted PVC, carries the filtered water down to the water-bearing layer. The recharge pit guide has the full section and sizes.

This is the right choice for most houses, schools and factories because the water reaches the aquifer directly, even where the top few metres are clay or the water table is 30 m down.

2. Converting an old, dry borewell into a recharge bore

If you have a bore that has already failed, it can become a recharge well. The pump comes out, a filter chamber goes on top, and clean roof water goes down it. This saves the cost of drilling, which is usually the largest single item.

3. Feeding filtered roof water into the working borewell

It is possible, but it is the method we recommend least. Your working bore is also your drinking water. Anything that gets past the filter goes straight into what you drink, and silt slowly chokes the bore screen. If you do it, use only roof water, never yard or road runoff, with a first-flush diverter and a filter you actually clean. A separate recharge bore a few metres away recharges the same aquifer without that risk.

How much water a roof can put back

Every 100 m² of roof (about 1,075 sq ft) in Gurugram, which gets roughly 600 mm of rain in a normal year, sends about 51,000 litres into the ground after losses. A 2,000 m² school or factory roof puts back about a million litres a year.

The recharge pit calculator works this out for your roof and your district's rainfall, and tells you how many pits you need. The rain figures for every district are on the rainfall pages.

What borewell recharge costs in 2026

One recharge point is the pit with its filling, the recharge bore, a filter chamber and the pipework. The bore depth is set by how deep the water is in your area, which you can check on the water table pages.

These come from the same unit rates as our rainwater harvesting cost pages, where civil work follows the CPWD schedule of rates. A house usually needs one point. A housing society or factory needs several.

Five mistakes that ruin a recharge system

1. No filter, or a filter nobody cleans. Silt seals the pit and the bore within two or three monsoons. Clean the filter and the top layer of sand before every monsoon.
2. Letting road or yard water in. Oil, sewage and fertiliser go straight into the aquifer you drink from.
3. A pit without a bore. Where the top layer is clay, a pit alone fills up and overflows. The bore is what reaches the water.
4. A bore that stops short. A recharge bore has to reach the layer that holds water, or it only wets the clay.
5. Recharging into saline water without testing. In parts of Haryana the shallow water is salty. Recharge still helps, but test first; see is your borewell water safe to drink?.

How long before you see a difference

A recharge point next to your bore helps from the first monsoon, especially in the months after the rain. The water table across a neighbourhood recovers over years, and only when neighbours recharge too, which is why we encourage housing societies and villages to plan recharge together. Our groundwater recovery plan shows how much recharge a district would need to stop the fall.

Do you need permission?

No permission is needed to recharge rainwater, and Haryana requires it on most new buildings: see the rainwater harvesting rules in Gurugram. Drawing groundwater is a different matter. We cover that in borewell permission in Haryana.

If your borewell is weakening, tell us where you are and your roof size. We will tell you how deep the recharge bore should go and what it will cost.