OK SB650

Requires governing bodies of municipally-owned or publicly-owned sanitary sewer utilities to adopt comprehensive maintenance and operation plans including mapping, inspection programs, root control, response protocols for sanitary sewer overflows (SSOs), and "Fats, Oils, and Grease" ordinances

Mandates adoption of funding availability models reviewed every 5 years with rate studies, plus 5-year capital improvement plans addressing severely occluded sewer lines, lift station repairs, and equipment needs

Increases property damage claim limits under the Governmental Tort Claims Act from $25,000 to $35,000 per claimant, and creates new caps for municipal sewer overflow claims: $5,000 per person for physical injury and $5,000 per person for nuisance/inconvenience damages, with $20,000 aggregate limits per occurrence

Provides immunity from personal injury claims for sanitary sewer overflows when utilities maintain systems in compliance with the required plans, and adds new liability exemptions for overflows caused by extraordinary rainfall events, overflows on lines with no prior reports within 3 years, and overflows on private property when the utility is compliant

Effective date November 1, 2025