Final results show 64.8% of voters endorsed a decision by the cantonal parliament from last year, based on a proposal by a member of the centrist Christian Democratic Party.
The amendment will bring Aargau in line with two other cantons.
Left-wing and some centrist parties unsuccessfully tried to overturn the parliamentary decision.
Under the law, citizenship requests can only be made by applicants who haven’t received social welfare for the past ten years. The current waiting period is three years – in line with regulations at a national level.
Potential candidates for a Swiss passport would also have to pass a test about basic facts of the country’s politics, society, history and geography.
The political left has denounced the legal amendment as discriminatory and disproportional. Political parties to the right argue stricter regulations are necessary to prevent an increase in welfare beneficiaries.
The citizenship procedure involves federal, cantonal and local authorities and leaves municipalities wide-ranging autonomy.
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How to get a Swiss citizenship
Swiss citizenship laws have undergone dramatic changes in the past 20 years.
Swiss price watchdog slams excessive prices for generic medicines
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The cheapest generic medicines available in Switzerland are more than twice as expensive as in other countries, according to a study by the Swiss price watchdog.
Nature should not figure in net zero calculations: academic study
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The natural removal of CO2 from the atmosphere by forests or oceans should not be included in the net-zero balance of climate protection measures, argue researchers.
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None of the 15 major Swiss retail banks is meeting international climate and biodiversity targets, according to a ranking by WWF Switzerland.
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Nestlé's new CEO Laurent Freixe, has presented plans for the future of the world's largest food company, after his first few weeks in office.
Swiss foreign minister calls on Moscow to end Ukraine war
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It's high time Moscow ended its war against Ukraine, Swiss foreign minister Ignazio Cassis tells the UN Security Council.
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The only alternative to the UN Palestinian agency’s work in Gaza is to allow Israel to run services there, Philippe Lazzarini, UNRWA Commissioner-General, told reporters in Geneva on Monday.
Study reveals food culture differences between Switzerland and neighbours
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Three-quarters of Swiss people consider eating to be a pleasurable, social activity, a new survey reveals. Healthy eating, however, plays a much less important role, it found.
If you want to start a conversation about a topic raised in this article or want to report factual errors, email us at english@swissinfo.ch.
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Italian unfairly denied Swiss citizenship after 30-year residence
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The man was rejected for poor social integration and because his geographical and cultural knowledge was deemed insufficient. But the court said that too much emphasis had been placed on these criteria and that some of the questions he was asked were too specific. For example, he did not know that bears and wolves are…
Swiss court backs residency request of welfare recipient
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The Federal Administrative Court has overturned the decision of the State Secretariat for Migration to refuse residence permits to the children of a foreigner who received social assistance while studying in Switzerland.
Ten things you need to know about Swiss citizenship
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How do you become Swiss? Who is entitled to naturalization? swissinfo.ch has collected questions from readers, and ten of them are answered here.
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Foreigners who gain Swiss citizenship generally increase their annual earnings by CHF5,000 compared to those who don't get naturalized.
Swiss revoke mother’s citizenship over suspected Islamic State links
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The Swiss authorities have revoked the citizenship of a French-Swiss women for her suspected links to the Islamic State militant group.
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If you want to start a conversation about a topic raised in this article or want to report factual errors, email us at english@swissinfo.ch.