The study investigated the impact of integrated marketing communication by various sachet water companies on customer behaviour in Owo Local Government Area of Ondo State, Nigeria. The study relied on a survey. The sample size was 154 respondents, comprising staff from thirteen (13) functioning sachet water companies registered with the National Agency for Food and Drug Administration and Control (NAFDAC) in Owo, LGA Ondo State, Nigeria. The study relied on connectionist theories. The questionnaire served as a data collection instrument. The study examined the collected data using descriptive statistics. The study found that respondents had a strong awareness of the effectiveness of integrated marketing communication. The findings revealed that applying IMC would increase consumer education and foster long-term client-customer relationships. The study concludes that marketing communications organisations may be able to address customers' marketing challenges more quickly by utilising integrated marketing communication, which will ultimately cut a product's overall promotional expense. The study recommends that organisational management should ensure that horizontal and top-down (vertical) communication techniques do not lead to misunderstandings about their company's aims. It is critical that all Integrated Marketing Communications (IMC) initiatives align with the overall business goal and vision of sachet water companies operating in Owo LGA, Ondo State, Nigeria.