Relating to exempt wells that supply ground water for domestic purposes.

The bill's effective date was changed from June 1, 2026 to January 1, 2027, delaying when the testing requirements begin to apply.

The term 'ground water management area' was changed to 'ground water quality management area' in the summary, clarifying the specific type of area where testing is required.

The bill's version designation was updated from 'B-Engrossed' to 'C-Engrossed' to reflect Senate amendments and the inclusion of House and Senate amendments in the final version.

Added requirement that the dwelling unit must be within a ground water management area for the landlord testing requirements to apply.

Changed the operative date from June 1, 2026 to January 1, 2027.

Updated tenant notice requirements to include information about the ground water management area designation.

Added reference to ORS 468B.150 for the definition of ground water management area.

Contaminant testing requirements were expanded to include coliform bacteria and lead in addition to arsenic and nitrates.

Regulatory oversight shifted from the Department of Environmental Quality to the Oregon Health Authority.

Landlord testing procedures were simplified by removing specific laboratory accreditation confirmation steps and updating reporting formats to reference the new authority.

Water testing requirements were updated to reference EPA maximum contaminant levels as most recently published rather than fixed standards.

Requirements for landlords to treat or repair wells upon contamination were removed from the main text, though the authority to require treatment remains.