The bill amends existing Washington statutes that govern public water systems, utilities commission authority, and rate-setting procedures. It does not create a new crime or specify criminal penalties in the provided text; the changes are regulatory and procedural in nature, modifying notice, approval, operational, and ratemaking requirements for water systems and water companies. Before a change of ownership the bill requires notification to the county, any water district or public utility district operating in the county, and adjacent public water systems, and requires customers receive mailed notice or public posting at least 90 days before acquisition with a good faith estimate of future capital improvements and rate changes. It adds or clarifies duties for group A public water systems (source protection, adequate treatment, operation and maintenance, planning, contact and emergency information, submission of plans/documents, and corrective actions) and restricts approval of new group A systems and certain group B systems unless owned or operated by a satellite system management agency meeting financial viability standards or otherwise conditioned for future satellite management or periodic operational review. Local boards of health may adopt more stringent satellite management requirements. The bill tightens commission oversight of transactions: a public service company must get commission authorization before selling, leasing, assigning, disposing of, merging, or consolidating franchise or facilities necessary for service, and the commission must not approve transactions resulting in a controlling interest in a gas, water, or electrical company unless the transaction provides a net benefit to customers. Prior to approving a transaction that changes controlling interest in a water company, the commission must verify that the required notifications and 90-day customer notices (with estimates of future improvements and rate changes) were provided. Transactions to special purpose districts, cities, counties, or towns are excluded from that commission authorization requirement. The bill also directs the commission to adopt rules on incorporating allowable cost of capital into rates that account for external funding and require showing the water company is following its approved water system plan (that provision is cut off in the provided text). The rate-setting provisions (some beginning mid-clause) allow a waiver process for emergency public-health or safety improvements, require the commission to consider consumer notice of planned capital projects and rate impacts, rate smoothing, and a system’s planning capacity, and permit a reserve account for capital improvements approved by the Department of Health or required for regulatory compliance (expenditures needing prior commission approval and treated as customer contributions). Beginning January 1, 2027, water companies filing general rate cases may propose multiyear rate plans subject to adjudicative proceedings; the commission may approve, conditionally approve, or reject them, may allow recovery of up to 5% of the approved total revenue requirement per year to fund low-income customer assistance, must separately approve rates for each rate year, determine fair value of used-and-useful property (and may order refunds if expected property is not in service by the rate effective date), and may set terms to keep rates fair during a multiyear plan. Important definitions (for example, “group A,” “group B,” “public water system,” “used and useful,” and “total revenue requirement”) and parts of the amendment to RCW 80.28.022 are not included in the extracted text, so some implementation details and the full wording of certain provisions are unclear from the provided material.

If enacted, the law would give regulators and local governments much more say before water systems change hands and would impose clearer operational duties on public water systems: customers must get mailed or posted notice at least 90 days before an ownership change along with a good-faith estimate of planned capital work and likely rate effects; new and small systems would face tighter approval limits unless they join or are run by a designated satellite management agency and can show financial and managerial capacity; and existing public systems must maintain source protection, treatment, 24-hour emergency contact info, planning and engineering submittals, and take corrective actions to keep water safe and reliable. This will most directly affect private water companies and small/new systems, which will face higher compliance and transaction costs, more barriers to independent creation or sale, and greater pressure or incentives to consolidate into satellite-managed public systems. Customers should get earlier and clearer notice of ownership and capital plans and may see multiyear rate options that smooth increases and include up to 5% per year of approved revenues to fund low-income assistance, while reserve accounts for approved capital work could be funded through rates as customer contributions. The utilities regulator, counties, water districts, public utility districts, and health and ecology agencies will take on more review and oversight responsibilities. Some details and definitions needed to implement these changes (for example exact group A/B definitions and the rest of the cost-of-capital rule language) are missing from the provided text.