The Iran war is rattling India's $5 billion packaged water market just ahead of the sweltering ‌summer season.

One of the world's fastest growing bottled water markets is seeing some manufacturers hike prices for distributors, as supply disruptions linked to ​the war fuel higher costs in everything from plastic bottles to caps, labels and cardboard boxes.

Though retail prices are yet to feel the heat ​and bigger companies ​are absorbing the pain, about 2,000 smaller bottled water makers have increased rates for their resellers by around 1 rupee per bottle, a 5% hike, which will rise by a further 10% in coming days, according ⁠to the Federation of All India Packaged Drinking Water Manufacturers' Association.

Consumers usually pay less than 20 rupees, or around 20 U.S. cents, for a one-litre bottle.

"There is chaos and within the next 4-5 days, this will start impacting customer prices," said Apurva Doshi, the federation's secretary general.

Rising oil prices have increased the cost of polymer, which is made from crude oil and ​is a key material ‌for the industry's plastic ⁠bottles. The cost of material ⁠used in making plastic bottles has risen by 50% to 170 rupees per kilogram, while the price of the caps has more than ​doubled to 0.45 rupees apiece. Even corrugated boxes, labels and adhesive tape are costing ‌much more, industry letters showed.

Clean water is a privilege in the country of ⁠1.4 billion people where researchers say 70% of the groundwater is contaminated, leaving people reliant on bottled water. Companies including Bisleri, Coca-Cola's Kinley, Pepsi's Aquafina, billionaire Mukesh Ambani's Reliance and Tata all compete for a share of the $5 billion market.

The companies did not respond to Reuters request for comment.

PREMIUM WATER FACES HEAT TOO

Within the broad bottled water market, natural mineral water is a $400 million business in India and a new, fast-growing wellness product for India's wealthy.

The premium water segment accounted for 8% of the bottled water market last year in India, compared to just 1% in 2021, Euromonitor says.

Aava, which sells mineral water sourced from the foothills of the Aravalli mountains, has increased prices of its water bottles by 18% for ‌resellers, Shiroy Mehta, CEO of the company, told Reuters.

"Most manufacturers are absorbing 40-50% of ⁠the cost to ensure that they don't lose clients. It's a poor situation ​for the beverage industry ahead of the summer season," he said.

The mass market, however, is dominated by companies that produce "drinking water" to be sold in 1-litre bottles to customers. Clear Premium Water, a brand of India's Energy Beverages, said in a notice to its distributors ​there had been an "unprecedented and ‌continuous surge" in prices of key raw materials used in packaging and production.

"It is ⁠no longer possible for us to absorb the ​escalating costs while maintaining existing product prices," the notice said.

(Reporting by Aditya Kalra; Editing by Kate Mayberry)