Under a BOOT (Build-Own-Operate-Transfer) contract, the treatment company designs, finances, builds and operates the plant on your site, and you pay a fee per kilolitre treated instead of the capital cost. At Navbharat Water, terms run 10–20 years, typically 12–15, after which ownership transfers to you.
Build-Own-Operate-Transfer is not new, but many industrial buyers are unsure how to evaluate a BOOT contract against buying a plant outright. This guide covers how the fee works, when the model makes financial sense, where the risk sits and what to check before signing.
What is the BOOT model in water treatment?
BOOT is a financing and operating model in which the provider funds 100% of the plant's capital cost, owns and runs it for an agreed term, and transfers it to the client at the end. The client pays nothing upfront; it pays a monthly service fee based on the volume of water treated.
Each word describes a phase. Build: the provider engineers, procures and commissions the ETP, STP or ZLD plant at your site. Own: the provider holds title to the equipment and bears the cost of replacing it. Operate: the provider staffs, maintains and runs the plant to the agreed outlet quality. Transfer: at the end of the term, ownership passes to you.
Navbharat Water offers BOOT for plants from 50 KLD upwards. Below that size, the investment economics do not work, and a conventional CAPEX installation with an Annual Maintenance Contract is the better route.
How is the BOOT service fee structured?
The fee is charged per kilolitre treated and covers capital recovery, operation, maintenance, consumables and replacements. Navbharat Water's BOOT fees are typically ₹15–25 per KL, depending on technology and capacity. On a 300 KLD pharmaceutical ETP in Ahmedabad, the fee is ₹18 per KL.
Technology is the biggest variable. A biological ETP or STP costs less per KL to finance and run than a plant with RO and evaporation stages, which carry higher capital and energy costs. Capacity matters too: larger plants spread fixed costs over more kilolitres.
Simple arithmetic helps frame the commitment. At ₹18 per KL, a 300 KLD plant running at full capacity every day would bill about ₹19.7 lakh a year (300 × 18 × 365). In the Ahmedabad case, that replaced a ₹3.8 Cr capital outlay the client would otherwise have made, as well as its own operating costs.
How does BOOT compare with CAPEX, WaaS and AMC?
The four models differ in who pays upfront, who operates the plant and who owns it at the end. BOOT needs zero capital and ends with ownership after 10–20 years; Water-as-a-Service also needs no capital but never transfers; CAPEX and AMC mean you own the plant from day one.
| Factor | CAPEX (own and operate) | CAPEX + AMC | BOOT | Water-as-a-Service |
|---|---|---|---|---|
| Upfront capital | 100% client | 100% client | Zero; provider funds 100% | Zero |
| Who operates | Client | Provider maintains; client owns | Provider | Provider |
| Ownership | Client from day one | Client from day one | Provider during term; transfers to client | Provider, indefinitely |
| Payment | Capital plus own running costs | Capital plus fixed annual AMC fee | Per-KL service fee | Per-KL price for treated water |
| Capital replacements | Client | Client, unless included | Provider | Provider |
| Operator on consent | Client | Client | Provider | Provider |
| Minimum size (Navbharat Water) | None | None | 50 KLD | Project-specific |
Water-as-a-Service suits clients who never want to run a plant: Navbharat Water owns and operates it indefinitely under an SLA guaranteeing uptime of 99% or more. BOOT suits clients who want the plant eventually, but not the capital outlay or operating burden now.
When does BOOT make financial sense?
BOOT makes sense when capital is better spent on the core business, when a compliance deadline is too tight for a normal procurement cycle, or when in-house operating capability is thin. The plant needs to be at least 50 KLD, and the per-KL fee must compare well with owning and running it yourself.
- Capital is constrained or earmarked for production capacity that earns a higher return than a treatment plant.
- A compliance notice has arrived with a 30–60 day deadline, leaving no time for budget approval, tendering and financing.
- The site lacks trained operators, or plant failures have already caused compliance incidents.
- Expansion plans are uncertain, and the business prefers a variable cost that tracks water volume.
The honest comparison is net present value. Discount the BOOT fees over the term at your cost of capital and compare them with the capital cost plus your own operating, maintenance, replacement and staffing costs over the same period. If your cost of capital is high, or your operating costs would be, BOOT tends to win. If capital is cheap and you already run plants well, owning may be cheaper. Navbharat Water's ROI Calculator gives a first estimate of payback and savings.
Who carries compliance risk under a BOOT contract?
Under Navbharat Water's BOOT and WaaS contracts, Navbharat Water applies for and holds the CPCB or SPCB consent for the treatment plant and appears as operator on regulatory documents. Liability for treatment non-compliance sits with Navbharat Water; yours ends at the treated water outlet. An annual third-party compliance audit is included.
This is often the most valuable part of the contract. On the Ahmedabad pharmaceutical ETP, Navbharat Water has operated the plant for four years at 99.3% uptime, with GPCB compliance maintained, zero show-cause notices and no operating load on the client's EHS team. Contracts also include force majeure provisions for regulatory changes and commit to adapting the plant to future standards.
What should you check before signing a BOOT contract?
Check seven terms before signing any BOOT contract: the term length, fee basis and any indexation, the outlet quality guarantee, capital replacement obligations, the transfer valuation method, early termination terms and who holds regulatory consent. A 10–20 year agreement deserves the same scrutiny as a major capital purchase.
- Term: at Navbharat Water, 10–20 years, typically 12–15. Longer terms lower the fee but extend the commitment.
- Fee basis: confirm the per-KL rate, how volume is metered, and whether and how the fee is indexed over the term.
- Performance guarantee: the outlet specification, how it is tested, and the remedy if it is missed.
- Replacements: who pays for membranes, pumps and instruments. Under Navbharat Water's BOOT, the provider does, at no extra cost.
- Transfer valuation: Navbharat Water transfers at written-down value at the transfer date.
- Early termination: typically a buy-out of the provider's remaining invested capital at a pre-agreed formula.
- Consent and liability: whose name is on the consent, and who indemnifies whom for fines.
What happens at the end of the BOOT term?
At the end of the term, typically 12–15 years, ownership of the plant transfers to you at its written-down value. From then on you run it yourself, contract an AMC, or negotiate a new operating arrangement. Plan the handover at least a year ahead, covering condition surveys, spares, drawings and operator training.
Because the provider pays for replacements during the term, it has every reason to keep the plant in working order, and a joint condition survey before transfer confirms it. The documentation matters as much as the hardware: as-built drawings, operating manuals, maintenance history and consent records should all be handed over with the keys.
To discuss a BOOT, Water-as-a-Service or AMC arrangement for a specific site, see Navbharat Water's Service Models at /solutions/service-models.
Frequently asked questions
Who owns the equipment during a BOOT contract?
The provider. Navbharat Water owns all equipment throughout the BOOT term and is responsible for capital replacements, including membranes, pumps and instruments, at no extra cost to the client. At the end of the agreed period, typically 12–15 years within a 10–20 year range, ownership transfers to the client at written-down value.
What is the minimum plant size for BOOT?
Navbharat Water offers BOOT from 50 KLD upwards. Below that, the investment economics do not support the model, so a conventional CAPEX installation with an Annual Maintenance Contract is recommended. For small ZLD requirements, shared infrastructure or a rental arrangement with a per-kilolitre treatment fee are alternatives.
How much does BOOT cost per kilolitre?
Navbharat Water's BOOT fees are typically ₹15–25 per KL treated, depending on technology and capacity. Simpler biological plants generally cost less per KL than plants with RO and evaporation stages. On a 300 KLD pharmaceutical ETP in Ahmedabad, the fee is ₹18 per KL, and the client avoided ₹3.8 Cr of capital expenditure.
Can a BOOT contract be terminated early?
Yes. Every Navbharat Water BOOT contract includes early termination provisions. Termination typically triggers a buy-out of the provider's remaining invested capital at a formula agreed at signing. Discuss likely scenarios, such as a site closure, relocation or acquisition, before signing so the settlement is predictable.
Can BOOT help with an urgent compliance notice?
Yes. For clients facing an NGT or SPCB notice with a 30–60 day deadline, Navbharat Water can fast-track a BOOT or AMC arrangement, mobilise for a site assessment within 48 hours and provide a compliant interim solution while the permanent plant is engineered and commissioned. No capital approval is needed to start.
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