BERLIN--Germany's cabinet approved draft legislation on Wednesday effectively banning shale gas fracking for at least five years despite growing concern along business and western allies that the country is too reliant on gas imports from Russia.

"As long as risks are unaccountable or currently can't be conclusively assessed, fracking will remain forbidden," Environment Minister Barbara Hendricks said, alluding to concerns that the exploration technique could pollute groundwater.

Germany's draft law bans the use of hydraulic fracturing technology for drilling operations shallower than 3,000 meters, and all types of fracking in nature reserves and national parks.

Test drilling for fracking, which involves using a high-pressure mixture of water, sand and chemicals to break apart rocks to release shale gas, will be allowed in certain cases for scientific research however, according to the draft law.

Fracking technology has been used since the 1960s in Germany, allowing the industry to maximize the output of conventional gas fields. While fracking for conventional gas deposits will remain permitted, the new law tightens rules aimed at preventing water contamination from fluids released during the fracking process.

Germans are suspicious of fracking, fearing that it could poison agricultural and water supplies. Shale-gas carrying rock formations tend to be closer to the surface, and therefore closer to groundwater deposits.

Last week, Ms. Hendricks, a politician from the center-left Social Democrats, told broadcaster ARD that "we don't need" fracking, insisting that over the next two decades Germany is "expanding renewable energy sources further and energy efficiency technologies are getting better."

In Germany, gas is used mainly for heating, making it difficult to replace by alternative energy sources that are focused on generating power.

The government has said that it could change its mind on fracking if the energy industry were to improve its environmental track record and replace toxic substances with harmless ones. A panel of experts will reassess technological and scientific developments in mid-2018, potentially allowing commercial fracking in some cases from 2019.

Business representatives have slammed the draft law and called for Germany to allow fracking as a way of reducing the country's dependence on Russian gas.

Markus Kerber, head of the Federation of German Industry, known as BDI, warned the debate in Germany was paying too little attention to aspects like security of supply, value creation, and future technological developments.

"We're still dependent on the use of domestic gas to avoid reliance on imports," Mr. Kerber said.

Many energy-intensive German chemical and engineering groups, which face high energy prices here, have been beefing up investment in the U.S. in order take advantage of shale gas fracking.

But the political standoff with Russia, Germany's main natural gas supplier, over its annexation of Crimea and the crisis in eastern Ukraine has done little to boost enthusiasm for fracking among politicians.

Russia is Germany's biggest gas supplier, accounting for 39% of German natural gas imports in 2013 according to the Federal Agency for Geoscience and Raw Materials.

The upper house of parliament, the Bundesrat, will discuss the draft law and deliver an opinion on May 8. The bill will likely face opposition when it reaches the lower house of parliament--the Bundestag--from Greens who don't think the law goes far enough banning fracking outright.

Members of Chancellor Angela Merkel's Christian Democrats have also spoken out against the law on environmental grounds. Conservative lawmaker Andreas Mattfeldt told Deutschlandradio Kultur radio on Wednesday that party members take issue with the law's planned assessment of the environmental impact of test drilling and on the transport of waste water.

Surveys indicate voters are divided on fracking. The last poll by Forsa found 34% oppose it and 33% support it, with a further 25% supporting fracking as long as it is non-toxic. More than half of respondents said Germany should become less reliant on Russian gas given the conflict in Ukraine. The poll of 1,001, published last October, had a margin of error of plus or minus three percentage points.

Nonetheless, Fitch Ratings last week called the prospects for fracking in Germany "not great," as fracking in countries like Lithuania, Poland, Romania and Ukraine has stalled due to environmental opposition or a failure to find economically viable quantities of gas.

Write to Harriet Torry at harriet.torry@wsj.com

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