By Aries Poon And Fanny Liu 

TAIPEI--At World Gym, the largest fitness-club operator in Taiwan, members might have to finish a sweaty workout without a refreshing shower.

"The gym doesn't have water supply on Wednesdays and Thursdays. Visitors on those days have dropped by more than 50%," said a staff at the club in Taoyuan City, one of the areas dealing with restricted water supply as Taiwan faces its worst drought in nearly seven decades due to reduced rainfall in some key reservoirs in the north.

Since the end of February, the government has reduced the water supply by up to 10% for heavy industrial users that consume at least 1,000 metric tons of water each month.

As of Wednesday, households in some major cities in the north also had their water cut off for two days a week. Residents of New Taipei City, the suburb near the capital, could be seen lining up at water trucks, filling their bottles and buckets with water. The capital, Taipei, remains unaffected.

Taiwan is home to key suppliers of electronic components to global tech brands such as Apple Inc. and Qualcomm Inc. The government and companies said the water shortage hasn't affected production, as they have reduced water usage in nonmanufacturing processes and increased the use of recycled and wastewater.

"We have been cutting our water usage and we have our own water tanks for advance storage," said AU Optronics Corp., a major panel-display maker.

But if the dry spell extends into summer, some manufacturing activities might face disruption. Taiwan's rainy season typically runs from March to May, and is followed by the typhoon season, which lasts from June to August.

"If water-rationing measures tighten further, the company won't rule out purchasing water from external sources," AU Optronics said.

Taiwan's total rainfall between October and March was the lowest since record keeping began in 1947, according to the Central Weather Bureau. The Water Resource Agency said it forecasts a "high probability" of drier weather in the coming quarter.

Yang Kuei-hsien, deputy director of the statistics department at the Ministry of Economic Affairs, said the economic impact of the drought is minimal for now.

"But if the drought persists and water supply is suspended every two days, the impact on the industry will be more severe. Having said that, we expect the rainy season will start later this month at the earliest. Hopefully that will help ease the drought," Mr. Yang said.

According to an estimate by Yuanta-Polaris Research Institute, a prolonged drought into the summer could shave 0.2 percentage point off Taiwan's 2015 gross domestic product. The government expects GDP to rise 3.78% this year.

The Ministry of Economic Affairs said last week it aims to reform the water-pricing system within three years, adding that any changes are likely to be implemented in phases.

The government encourages conservation by offering incentives to those who save water. The authorities are also speeding up the process of clearing silt at reservoirs, which they said has contributed to reservoirs' reduced storage capacity during the rainy season.

An official from the Water Resource Agency said the government has cut the water supply to some rice fields since the beginning of the year. The size of the affected area accounts for about 10% of the total rice fields on the island.

Write to Aries Poon at aries.poon@wsj.com and Fanny Liu at fanny.liu@wsj.com

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