Sri Lanka NWSDB Water Connection Fee Calculator

NWSDB's upfront charge for a new connection is the sum of five published line items: a refundable service deposit, a one-time non-refundable connection fee, the cost of the water meter, the cost of the HDPE service pipe beyond a 6 m allowance, and any applicable surcharges (road crossing, sewerage). Each line is set in a Public Utilities Commission of Sri Lanka (PUCSL) Gazette Extraordinary and republished in the NWSDB New Connections guide.

The calculator follows the schedule in the order NWSDB applies it on a real application:

1. Service deposit — looked up by category × meter size. A 15 mm domestic deposit is Rs 9,000; a 50 mm industrial deposit is Rs 200,000. Refunded on disconnection less any unpaid bills.
2. Connection fee— looked up by the same key. Covers application processing, the area engineer's site visit, and the first 6 m of HDPE/PVC service pipe. Non-refundable.
3. Meter cost — uniform islandwide because NWSDB sources meters centrally through its Stores division. The 15 mm domestic meter is Rs 7,500; sizes above scale up to Rs 62,000 at 50 mm.
4. Extra material — for the run beyond the included 6 m, the per-metre HDPE pipe and fittings rate is applied. Rate scales with meter size from Rs 850/m at 15 mm to Rs 2,800/m at 50 mm. Fractional metres are rounded up to the next whole metre.
5. Road-crossing surcharge — flat Rs 15,000 where the service pipe must cross a public road. NWSDB collects this on behalf of the Road Development Authority for cutting and surface reinstatement.
6. Sewerage fee — Rs 25,000 only where NWSDB sewer mains are at the boundary (chiefly the Colombo Sewerage Service Area). Optional and additive.

The grand total is the sum of these lines. The calculator also reports the refundable / non-refundable split so a household budgeting for the connection knows how much capital is genuinely consumed versus held on deposit.

Cross-checking the math

Bracket and tier tools are the most common source of off-by-one bugs in online calculators, so this page runs the same total two ways and compares the answers before showing a number. The primary path assembles a list of itemised LineItem objects and reduces them; an alternate path adds the constants directly with no array step. The two values must equal to the rupee — if they ever disagree, the result panel shows a red warning rather than silently rendering a wrong number. The reconciliation runs on every input change, including the bracket-boundary case of distance exactly equal to 6 m where the material item correctly collapses to zero rather than being suppressed by a sign error.

What this tool does not include

Three costs are deliberately out of scope. First, the monthly water bill — once connected, your usage is billed under a separate block-tariff schedule which the Sri Lanka Water Bill Calculator handles. Second, the local-authority building approval fee — that falls under your Pradeshiya Sabha or Municipal Council, not NWSDB. Third, bulk supply for industrial estates above the 50 mm meter size, which NWSDB quotes case-by-case through its project engineers and is not covered by the published schedule. The calculator also does not model the (extremely rare) disconnection and reconnection charges, which are gazetted separately.

Why the area engineer's final quote can differ

Once NWSDB receives your application, the area engineer visits the site to confirm three things: the actual distance from your boundary to the nearest main (which can be longer than you measured because the pipe must follow legal alignments, not the shortest line); the ground condition (rock-cutting depth, presence of a drain, need for a road-cutting permit); and whether the existing main can handle the requested meter size or needs an extension. Where any of those raise additional cost, NWSDB issues a revised quotation before laying the pipe — you are not billed retroactively. The calculator gives the budget anchor against which to read that revised quote.

Three scenarios that map to the most common cases applicants ask NWSDB about. Plug each set of inputs into the calculator above and the itemised breakdown should match the figures below to the rupee.

• NWSDB — New Connections (procedure, categories, meter sizes)
• PUCSL — NWSDB tariff revisions and Gazette Extraordinary notices
• NWSDB Citizens' Charter (statutory SLAs)
• NWSDB — National Water Supply & Drainage Board (official site)

Rates were last cross-checked against the NWSDB published schedule and PUCSL gazette on 2026-05-17. The page is reviewed at every subsequent tariff order and within 48 hours of any amendment.