This study examined the design and development of a solar-powered venturi water aeration system and evaluated its economic cost-benefit analysis. Dissolved oxygen (D.O.), pH, and Total Dissolved Solids (TDS) are used as water quality parameters in terms of agricultural and industrial use. The solar-powered venturi water aeration system consists of two 100-watt solar panels connected to a 200W DC-DC step-down converter and a 65-watt DC submersible pump that produces microbubbles from the venturi pipe. The results found that a ½-inch venturi pipe is less expensive than a ¼-inch one, with no difference in D.O. production. There are 4.65-4.81 mg/L of D.O. and 7.18-7.23 pH ranges in 40 minutes of aeration time, aligning with the standard water discharge range for agricultural and industrial use. Furthermore, this system reduced the maximum TDS by 20%. The economic cost-benefit analysis shows a net present value (NPV) of 509 baths, an internal rate of return (IRR) of 8.90%, and a discounted payback period (DPB) of 7.2 years over a 20-year calculation period, indicating that the system is worth the investment.