The best toilet paper for septic systems is single-ply or septic-safe labeled paper that dissolves quickly in water. Brands like Scott Rapid-Dissolving and Seventh Generation are top choices. Avoid ultra-thick quilted or lotion-treated papers that resist breaking down. Test by placing a few sheets in a jar of water and shaking. Septic-safe paper disintegrates within seconds. Using less paper per flush also protects your system. Never flush wipes even those marketed as flushable.