Introduction: In Africa, in 2015, the prevalence of known hypertension under treatment but not controlled was 93%. The Objective of the study was to estimate its prevalence and identify its associated factors in Senegal. Methodology: This secondary analysis of the WHO STEPwise survey was descriptive and analytical. Data were collected from August 1st to December 15th, 2015. All subjects between the ages of 18 and 70 and residents of the territory were included. Those in a state of pregnancy, incapacity (mental, physical), absence from the household, or non-consent were not included. The sample size had been calculated with the WHO formula. Sampling was done by stratification in three sampling stages. Data collection was done on the WHO STEPS form. The statistical analysis of the data was done on Rstudio 4.0.2. with descriptive, bivariate, and multivariate analyzes by binary logistic regression. Results: The prevalence of known but non-controlled hypertension was 56.9%. The associated factors were: The “Very important” degree of personal perception of the importance of reducing salt consumption (ORa = 21.7; 95% CI = [2.49; 601]); the advice received to reduce salt consumption (ORa = 12.1; 95% CI = [1.81; 144]); physical activity when moving only (ORa = 0.11; 95% CI = [0.02; 0.58]); limiting the consumption of savory cooked meals (ORa=0.04; 95% CI=[0.00; 0.57]). Conclusions: We recommend that health practitioners go to populations to develop primordial and primary prevention of arterial hypertension, researchers conduct mixed studies on bad attitudes regarding salt consumption, administrative authorities develop cities where the practice of physical activity when moving is more easy and political authorities to issue mandatory warnings on the salt concentration of foods sold.