There are multiple studies referenced on the bloody same page linked by OP: 2018 'We found that lithium levels were significantly and negatively associated wit

There are multiple studies referenced on the bloody same page linked by OP: 2018 'We found that lithium levels were significantly and negatively associated with SMR averages for 2002–2006' https://www.cambridge.org/core/journals/the-british-journal-of-psychiatry/article/lithium-levels-in-drinking-water-and-risk-of-suicide/7C18AC894A0141D3D89B27282AF35DB2 https://www.cambridge.org/core/journals/the-british-journal-... 2017 "After adjusting for confounder (the number of women for 1,000 men), the lithium level remained statistically significant in men, but not in women." https://www.researchgate.net/publication/315599920_Lithium_levels_in_the_public_drinking_water_supply_and_risk_of_suicide_A_pilot_study https://www.researchgate.net/publication/315599920_Lithium_l... 2015 "Lithium concentrations and local suicide rates were not significantly inversely related, except in 1980-1989, particularly among women" https://www.researchgate.net/publication/280581760_Relationships_of_local_lithium_concentrations_in_drinking_water_to_regional_suicide_rates_in_Italy https://www.researchgate.net/publication/280581760_Relations... etc.,etc. But there is a better review here https://www.vox.com/future-perfect/2018/10/24/18010592/future-perfect-podcast-lithium-drinking-water-suicide https://www.vox.com/future-perfect/2018/10/24/18010592/futur...