In this work, solar disinfection of wastewater was studied, focused on the effect of selected environmental variables, namely, light intensity, continuous/intermittent light delivery, and post-irradiation storage as well as dilution in lake water. These variables were studied for their effect on disinfection efficiency and on post-irradiation survival/regrowth in undiluted wastewater and in wastewater diluted in lake water at different dilution rates. The bacterial inactivation curves were studied, and distinct kinetic phases were identified and interpreted. Dose primarily influenced the phases' demonstration and total inactivation times, independently from the irradiance. Intermittent illumination un-evenly prolonged the required exposure time and pointed to extended longer required illumination times when unstable weather conditions are to be expected. Post-irradiation survival/regrowth in undiluted wastewater showed three distinct kinetic profiles, with the transitions among them largely determined by the inflicted light dose.Lower doses resulted in similar inactivation profiles as high ones, when irradiation was followed by prolonged storage at high dilution rates in lake water. The studied factors show significant design and operation implications for solar wastewater applications, based on local environmental conditions and water receptor restrictions.